This document discusses the environmental impacts of agriculture and aquaculture. It notes that while farming can help environments when sustainably practiced, unsustainable practices pose major threats. Key impacts include habitat loss from land conversion, wasteful water consumption, soil erosion, various forms of pollution, contributions to climate change, and loss of genetic diversity. For aquaculture, the document outlines impacts such as destruction of habitats, overexploitation of wild juveniles, water depletion and salinization, disease issues, waste impacts on water quality, and effects of escaped farmed fish.
Freshwater and coastal aquaculture development can benefit from internal and external experience for preventing environmental damage and for avoiding harmful effects of degradation on aquaculture resources. Strategies to compensate for the loss of aquatic fauna (e.g. due to physical obstructions) are directly linked to important environmental issues, such as the transfer of exotic species, the spread of diseases and loss of genetic diversity, eutrophication, impairment of aesthetic qualities and the disruption of indigenous fish stocks.
There presently, conceptual frameworks for aquatic environment management backed by legal and administrative tools to create or enforce ration systems for water management, land use or fisheries and aquaculture development strengthened by adaptive institutionalization.
Freshwater and coastal aquaculture development can benefit from internal and external experience for preventing environmental damage and for avoiding harmful effects of degradation on aquaculture resources. Strategies to compensate for the loss of aquatic fauna (e.g. due to physical obstructions) are directly linked to important environmental issues, such as the transfer of exotic species, the spread of diseases and loss of genetic diversity, eutrophication, impairment of aesthetic qualities and the disruption of indigenous fish stocks.
There presently, conceptual frameworks for aquatic environment management backed by legal and administrative tools to create or enforce ration systems for water management, land use or fisheries and aquaculture development strengthened by adaptive institutionalization.
This presentation shows what is aquaculture, the different methods of aquaculture, and why aquaculture is important. Aquaculture benefits the oceans, economy, and environment. It maintains the health of our oceans, lessens the severity of overfishing, and reduces the transfer of diseases in sea creatures. It is a form of agriculture for those regions with poor soils and farming lands. In addition, aquaculture improves the health of the people by incorporating seafood into their diet.
1. Aquaculture – An Introduction
2.The development process
3.Major classification of aquaculture
4.Aqua farming in India… Types
5.Recent trends and status of freshwater fishculture technology in India
6.Indian freshwater fisheries
7.Available technology
8.The production processes
9.Composite fish culture
10.Trends in fish consumption and its impact on the fish production
11.Availability of fish and fishery products
12.Factors influencing the consumption
13.Trends in fish consumption
What is the stocking density of fish in semi intensive cultureihn FreeStyle Corp.
Stocking Density: Stocking density also known as per-unit stocking amount or stocking rate, refers to the quantity of fry or fingerlings per unit of water area.
Poly Culture: The concept of poly culture of fish is based on the concept of total utilization of different trophic and spatial niches of a pond in order to obtain maximum fish production per unit area. Different compatible species of fish of different trophic and spatial niches are raised together in the same pond to utilize all sorts of natural food available in the pond.
Semi Intensive Culture: Semi-intensive culture systems depend largely on natural food which is increased over baseline levels by fertilization and/or use of supplementary feed to complement natural food.
Many fishers and aquaculturists are poor and ill-prepared to adapt to change, making them vulnerable to impacts on fish resources. Nature of the climate change threat. Fisheries and aquaculture are threatened by changes in temperature and, in freshwater ecosystems, precipitation. Storms may become more frequent and extreme, imperilling habitats, stocks, infrastructure and livelihoods.
What is ecosystem? Relation between ecosystem and aquaculture ForamVala
An ecosystem is any spatial or organizational unit that includes a community of living and non-living parts.
The term ‘ecosystem’ was coined by A. G. Tansley (1935)- its ‘eco’ means environment and ‘system’ implies, a complex of coordinated units.
It may be as small as a puddle or as large as the entire earth (biosphere or ecosphere).
Further, an ecosystem may be natural as a pond, lake, river, estuary, ocean, forest, etc., or it may be man-made or artificial like an aquarium, a dam, a city, or a garden.
An ecosystem is any spatial or organizational unit that includes a community of living and non-living parts.
The term ‘ecosystem’ was coined by A. G. Tansley (1935)- its ‘eco’ means environment and ‘system’ implies, a complex of coordinated units.
It may be as small as a puddle or as large as the entire earth (biosphere or ecosphere).
Further, an ecosystem may be natural as a pond, lake, river, estuary, ocean, forest, etc., or it may be man-made or artificial like an aquarium, a dam, a city, or a garden.
The relationship between ecosystems and aquaculture is complex and interconnected.
Aquaculture, also known as fish farming, involves the cultivation of aquatic organisms such as fish, shellfish, and plants in controlled environments like ponds, tanks, or cages.
Ecosystems, on the other hand, are natural systems consisting of living organisms (plants, animals, and microorganisms) interacting with each other and their physical environment.
This presentation shows what is aquaculture, the different methods of aquaculture, and why aquaculture is important. Aquaculture benefits the oceans, economy, and environment. It maintains the health of our oceans, lessens the severity of overfishing, and reduces the transfer of diseases in sea creatures. It is a form of agriculture for those regions with poor soils and farming lands. In addition, aquaculture improves the health of the people by incorporating seafood into their diet.
1. Aquaculture – An Introduction
2.The development process
3.Major classification of aquaculture
4.Aqua farming in India… Types
5.Recent trends and status of freshwater fishculture technology in India
6.Indian freshwater fisheries
7.Available technology
8.The production processes
9.Composite fish culture
10.Trends in fish consumption and its impact on the fish production
11.Availability of fish and fishery products
12.Factors influencing the consumption
13.Trends in fish consumption
What is the stocking density of fish in semi intensive cultureihn FreeStyle Corp.
Stocking Density: Stocking density also known as per-unit stocking amount or stocking rate, refers to the quantity of fry or fingerlings per unit of water area.
Poly Culture: The concept of poly culture of fish is based on the concept of total utilization of different trophic and spatial niches of a pond in order to obtain maximum fish production per unit area. Different compatible species of fish of different trophic and spatial niches are raised together in the same pond to utilize all sorts of natural food available in the pond.
Semi Intensive Culture: Semi-intensive culture systems depend largely on natural food which is increased over baseline levels by fertilization and/or use of supplementary feed to complement natural food.
Many fishers and aquaculturists are poor and ill-prepared to adapt to change, making them vulnerable to impacts on fish resources. Nature of the climate change threat. Fisheries and aquaculture are threatened by changes in temperature and, in freshwater ecosystems, precipitation. Storms may become more frequent and extreme, imperilling habitats, stocks, infrastructure and livelihoods.
What is ecosystem? Relation between ecosystem and aquaculture ForamVala
An ecosystem is any spatial or organizational unit that includes a community of living and non-living parts.
The term ‘ecosystem’ was coined by A. G. Tansley (1935)- its ‘eco’ means environment and ‘system’ implies, a complex of coordinated units.
It may be as small as a puddle or as large as the entire earth (biosphere or ecosphere).
Further, an ecosystem may be natural as a pond, lake, river, estuary, ocean, forest, etc., or it may be man-made or artificial like an aquarium, a dam, a city, or a garden.
An ecosystem is any spatial or organizational unit that includes a community of living and non-living parts.
The term ‘ecosystem’ was coined by A. G. Tansley (1935)- its ‘eco’ means environment and ‘system’ implies, a complex of coordinated units.
It may be as small as a puddle or as large as the entire earth (biosphere or ecosphere).
Further, an ecosystem may be natural as a pond, lake, river, estuary, ocean, forest, etc., or it may be man-made or artificial like an aquarium, a dam, a city, or a garden.
The relationship between ecosystems and aquaculture is complex and interconnected.
Aquaculture, also known as fish farming, involves the cultivation of aquatic organisms such as fish, shellfish, and plants in controlled environments like ponds, tanks, or cages.
Ecosystems, on the other hand, are natural systems consisting of living organisms (plants, animals, and microorganisms) interacting with each other and their physical environment.
Causes of biodiversity loss with particular reference to GhanaAbdul-Baqi Alhassan
The 1992 United Nations Earth Summit in Rio De Janeiro defined biodiversity as “the variability among living organisms from all sources among other things, terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems. It is also explained as the variety of life; the different plants, animals and micro-organisms, their genes and the ecosystem of which they are a part.
Biodiversity in Ghana has within the three main bio-geographic zones. So far about 2,974 indigenous plant species, 204 fishes, 728 birds, 225 mammals, 221 species of amphibians and reptiles have been recorded. The species of frogs, 1 lizard and 23 species of butterflies have been reported to be endemic. Animals found in Ghana been grouped as follows: mammals and primate, reptiles and amphibians, aquatic and marine, wetland birds, forest zone birds, savanna zone birds, insects and spiders.
Coastal aquaculture is having an adverse impact on the environment due to intensive shrimp culture. several other factors are also getting affected due to intensive coastal aquaculture.
AGRICULTURE AND ENVIRONMENTAL MANAGEMENT
THEME 5.0: AGRICULTURE AND ENVIRONMENTAL MANAGEMENT
Environmental degradation
Environmental degradation is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems and the extinction of wildlife. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable. As indicated by the I=PAT equation, environmental impact (I) or degradation is caused by the combination of an already very large and increasing human population (P), continually increasing economic growth or per capita affluence (A), and the application of resource depleting and polluting technology (T).
Environmental degradation is one of the ten threats officially cautioned by the High-level Panel on Threats, Challenges and Change of the United Nations. The United Nations International Strategy for Disaster Reduction defines environmental degradation as "The reduction of the capacity of the environment to meet social and ecological objectives, and needs". Environmental degradation is of many types. When natural habitats are destroyed or natural resources are depleted, the environment is degraded. Efforts to counteract this problem include environmental protection and environmental resources management.
Toxic Algae and Their Environmental Consequences_ Crimson PublishersCrimsonpublishersTTEH
Toxic Algae and Their Environmental Consequences by Syed Hasnain Shah*, Tanzeelur Rahman, Ghulam Mujtaba Shah, Syeda Tayyaba Bibi and Saqib Zahoor in Crimson Publishers: Health informatics
Harmful algae reproduction (HAB) occurs when algae producing toxins grow in water algae are microscopic organisms that live in an aquatic environment and through photosynthesis generate chemical energy from sunlight like higher plants. The growth of algae or algal blooms is visible with naked eye and are green layers, it might be blue, red or brown depending on the type of algae natural waters such as lakes, ponds and rivers always contain algae, but few species produce toxins In such algae, the production of toxins can be induced by environmental conditions like light, temperature and nutrients levels. The release of algae or algae toxins can have serious adverse effects on humans, fish, animals and other strata of the ecosystem
https://crimsonpublishers.com/tteh/fulltext/TTEH.000519.php
For more Open access journals in Crimson Publishers
Please click on: https://crimsonpublishers.com/
For more Articles on Health informatics
please click on link: https://crimsonpublishers.com/tteh/index.php
Water Resources and Water PollutionLife on planet Earth would be.docxmelbruce90096
Water Resources and Water Pollution
Life on planet Earth would be impossible without water. All life forms, from unicellular bacteria to multicellular plants and animals, contain water. Humans are composed of approximately 60 percent water by body weight and we depend on water, not only for our survival, but for our convenience: We drink it, cook with it, wash in it, travel on it, and use an enormous amount of it for agriculture, manufacturing, mining, energy, production, and waste disposal. Though 71% of the Earth’s surface is covered in water, only 0.024% of the overall water supply is available as liquid freshwater that is easily accessible. It is one of the most poorly managed resources, easily wasted and often polluted. The available freshwater is collected, purified and distributed in the hydrologic cycle, but this cycle is easily interrupted by overloading with pollution, reducing wetlands, and reducing forests.
We get water from groundwater and surface water. Groundwateris water that seeps into the ground between spaces in soil and gravel until it reaches impenetrable bedrock. One of the most important sources of freshwater. The top of the groundwater zone that moves up and down based on weather is the water table. The water table drops in level when humans remove water at a faster rate than it is replenished. Surface wateris freshwater from precipitation and melted snow that flows into lakes, wetlands, rivers, and eventually into the oceans.
Water shortages are caused by many factors including dry climate and drought. In some places, the human population uses water at a faster rate than the water is replenished. 30% of the Earth’s land mass now experiences severe or extreme drought and 1 billion people lacked regular access to clean water for drinking, cooking, and washing.
Water Supplies
Aquifers, underground water supplies, are renewable as long as the groundwater doesn’t become contaminated and withdrawn too quickly. Most aquifers around the world, and in the largest food producing countries, are being used up quicker than their rate of replenishment. Dam and reservoir systems are used to capture and hold runoff water. The collected water can be released at need to control flooding, supply water for farming and cities, and to produce electricity. The use of dams and reservoirs has increased the amount of reliable surface runoff by one-third. Unfortunately, these systems also displace people, flood productive lands, and disrupt the ecological services rivers provide.
Tunnels, aqueducts, and underground pipes transfer runoff from dams and reservoirs to water-poor areas. These transfer systems can be wasteful and environmentally harmful by shrinking the water source as more is transferred to water-poor areas. Another option for freshwater is desalinization which involves removing salts from ocean or brackish water. Usually desalinization costs a lot because of the energy required; it also kills many marine organisms and creates salty.
agricultural pollution which is a current major issue by any country in the world especially the countries like india and china are agricultural countries as i think this is the best seminar topic
Similar to Impacts of agriculture, aquaculture on environment (20)
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
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Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
2. Agriculture
The term “Agriculture” may be defined as: the art and
science of growing plants and other crops and the
raising of animals for food, other human needs, or
economic gain.
It is the science, art, or occupation concerned with
cultivating land, raising crops, and feeding, breeding, and
raising livestock; farming.
3. Agriculture & Environment
Often, when speaking of the agricultural impact on
the environment, one restricts any consideration to
processes of pollution of surface and ground waters
from chemicals added to the soil during agricultural
practices.
No doubt, such processes exist and may have even a
prominent importance. They are caused either by
water infiltration in soil, with the consequent
possibility of nutrient and pesticide leaching.
4. Impact of Environment on Agriculture
Environment effect the agriculture due to:
Global warming
Heavy rainfalls
Floods
Acidic Rains
Wind erosions
Land sliding
5. Agricultural & Environmental Implications
Developing measures that will encourage flexibility in
land use. Crop management in relation to climate
change is a key topic of global concern.
Increasing water management efficiency in order to
sustain agricultural production under changing
climatic conditions.
Integrating agricultural, environmental and cultural
policies to preserve the heritage of rural environments.
6. Environmental Impacts of Agriculture
When farming operations are sustainably managed,
they can help preserve and restore critical habitats,
protect watersheds, and improve soil health and water
quality.
But when practiced without care, farming presents the
greatest threat to species and ecosystems.
7. Multiple Impacts
Negative environmental impacts from unsustainable
farming practices include:
Land conversion & habitat loss
Wasteful water consumption
Soil erosion and degradation
Pollution
Climate change
Genetic erosion
9. Land conversion & habitat loss
A major and growing land use:
Agriculture is a major land use. Farmland covers 38% of
the world's land area. This area is still expanding to
meet demand for food.
Natural habitats converted to monocultures:
Rising demand for food and other agricultural products
has seen large-scale clearing of natural habitats to make
room for intensive monocultures.
10. Land conversion & habitat loss
Freshwater is also affected:
Waste water of Fields also effect to the fresh water of
river ,oceans Etc.
Land lost to desertification:
On top of habitat loss due to clearing, unsustainable
agricultural practices are seeing 12 million hectares of
land lost each year to desertification.
12. Wasteful Water Consumption
Agriculture, the greatest user of water:
Globally, the agricultural sector consumes about 70% of
the planet's accessible freshwater more than twice that
of industry (23%), and dwarfing municipal use (8%).
Wasteful and unsustainable:
The main causes of wasteful water use are:
1. leaky irrigation systems
2. wasteful field application methods
3. cultivation of thirsty crops not suited to the
environment.
14. Soil Erosion and Degradation
Flooding increased:
Erosion caused by deforestation can also lead to
increased flooding.
Arable land destroyed:
It is estimated that since 1960, one-third of the world’s
arable land has been lost through erosion and other
degradation.
Waterways clogged & polluted:
Soil carried off in rain or irrigation water can lead to
sedimentation of rivers, lakes and coastal areas.
16. Pollution
The use of pesticides, fertilizers and other agrochemicals
has increased hugely since the 1950s.
Toxic pesticides:
Pesticides often don't just kill the target pest. Pesticides
can also kill soil microorganisms.
Excess nutrients:
Fertilizers are not directly toxic. However, their presence
in freshwater and marine areas alters the nutrient
system.
18. Climate change
Agricultural practices are responsible for around
14% of global greenhouse gas emissions
Sources include:
Fertilizers
Livestock
Wetland rice cultivation
Burning of savanna
Agricultural residues, and plugging
20. Genetic Erosion
Lost genetic diversity:
The widespread use of genetically uniform modern
crop varieties has caused agricultural crops to lose
about 75% of their genetic diversity in the last century.
This lost genetic diversity reduces the potential for
modern crops to adapt to, or be breed for, changing
conditions and so directly threatens long-term food
security.
21. Aquaculture
Aquaculture is the farming of aquatic organisms such
as fish, shellfish and even plants. The term
aquaculture refers to the cultivation of both marine
and freshwater species and can range from land-based
to open-ocean production.
22. AQUACULTURAL SYSTEMS, PRACTICES AND PROBLEMS
HAVING POTENTIAL IMPACT ON THE ENVIRONMENT
Destruction of Habitat for Aquacultural activities:
The creation of ponds for marine shrimp aquaculture
has led to the destruction of thousands of hectares of
mangroves and coastal wetlands.
Mangroves provide nursery grounds for many species,
including commercially important fish, and their
destruction may lead to substantial losses for
commercial fisheries.
23. Collecting wild Juveniles as Stock
Aquaculture of some species relies on juvenile fish or
shellfish being caught from the wild to supply stock,
rather than using hatcheries to rear them. Shrimp
farms in many areas rely on wild caught juveniles. This
has led to over exploitation and shortages of wild
stocks.
The main environmental impact of crab culture is the
procurement of larvae from wild brood stock, and the
on-growing of wild crablets.
24. Depletion and Salinization of Water/land
Pumping of groundwater to supply freshwater to
marine shrimp farms has resulted in depletion and,
sometimes, Salinization of local water supplies,
causing water shortages for coastal communities.
There have also been many reports of crop losses after
agricultural land has become salinized by effluent
water pumped out from shrimp farms onto land.
25. Poor research in fish diseases and abuse of medicines
Novel fish diseases cannot be treated, and diagnosis of
aquatic diseases in the third world involves
undeveloped instruments and weak technical power.
Hence inability to distinguish bacterial and nutritional
diseases, which directly influence correct medication.
Once the disease comes on, the abuse of medicines is
imminent.
26. Weak environment protection consciousness
Though various high-yielding aquaculture methods
such as industrial fish farming, cage fish culture, and
raceway culture are developed to some extent.
Fishing and environment protection consciousness are
still deficient, and the random discharge of
aquaculture waste waters without any treatment has
deteriorated the whole aquaculture environment, and
blocked the sustainable development of this industry.
27. Residual feeds and excrements (fish waste)
Feeds are the basic material of aquaculture, and the
source of main nutritional matters.
Most feeds of aquaculture are outside source foods and
given to aquatic animals directly. Large amount of
residual feeds and the excrements of aquatic animals
all impact the water environment.
28. Escaping Salmon and their threat to Wild Fish
Farmed Atlantic salmons have escaped in vast
numbers and are successfully breeding with their wild
counterparts.
Farmed salmon have a lower genetic variability than
wild salmon. Experiment show that the offspring are
less fit than wild salmon and a high proportion die.
Interbreeding of farmed with wild salmon could
therefore drive already vulnerable populations of wild
salmon towards extinction.
29. Environmental impacts of Aquaculture
Influence on physiochemical parameters
of water:
The main influence of aquaculture on water
quality is to increase the suspended
substances and the nutritional salts in waters.
Cages used in aquaculture can also reduce the
dissolved oxygen in the water. The wastes of
cage aquaculture increased the total
concentration of water nutrient and increased
the turbidity of the waters.
30. Influence on substrate of aquaculture facilities
On the bottom of facilities used in aquaculture, the
contents of C, N and P are higher than the contents
those used for other purpose, and the oxygen
consumption is also higher.
When the organic matters accumulated on the mud
bottom are too much, the physiochemical index of the
bottom will be changed, and the decomposing function
of microorganisms results into bloom, and the
dissolved oxygen in the bottom is depleted, as a result of
numerous sulfates in the water, hydrogen- sulphide
(H2S) build up in the environment.
31. Influence on planktons and bottom dwellers
The input of outside-source materials and organic
matters can increase the productivity of the planktons.
Feeds make the nutrient matters in waters to gradually
increase, and the phytoplankton propagated largely at
the beginning, but as time goes on and the continual
expansion of aquaculture is still on a large scale, the
nutrient matters input increases to a point the water
quality deteriorates, so the amount of phytoplankton
will begin to reduce.
32. Escaped domestic fish and ecosystem health
Another influence of aquaculture on aquatic biology is
that the escaping fishes would impact their wild
neighbours in biology.
Escapees from small-scale scenarios and unreported
escape cases seem to make up a large proportion of the
escaped farmed fish. The escaping fishes in the
aquaculture may spread diseases and change the
inheritance composition of genes of wild swarm, and
infect local epidemics to wild swarms.
33. The influence on the ecological environment
In the recent years, because of the development of
aquaculture, the seductive profit of aquaculture has
raised a aquatic tide in the world, most lakes, rivers,
swamps, coastal lowlands and mudflats are changed
into shrimp culture ponds and fish culture ponds.
These lowlands were mangroves, saline soils and
agricultural lands, and some of them were inhabiting,
spawning and refuge places for many fishes and
shellfishes. Unreasonable development will destroy
the ecological environment of shells, and the natural
resource.
34. Reduced functionality of wetlands
Natural wetland functions support a wide array of
environmental goods and services that sustain
economic activities and societal systems. However,
aquaculture development can damage the functional
integrity of wetlands, disrupting the supply of
environmental good and services.
Loss of the mangrove root system could decrease
sediment stability, leading to erosion, which could
increase saline intrusion and the risk of flooding
inland.
35. Self-pollution
Wastewater from land-based aquaculture is routinely
discharged to streams and rivers supplying other
aquaculture operations downstream, whilst waste
discharged from pen and cage farms may be conveyed
to other farms by currents and tides.
Moreover, for pen and cage aquaculture facilities there
is a danger that discharged wastes that may
contaminate water intended to supply the farm.
36. High potential strategies for low impact aquaculture
Community-based management:
Community-based management usually centers on
common pool resources ‘non-exclusive resources to
which the rights of use are distributed among a
number of co-owners, generally identified by their
membership to some group such as a village or
community.
Include: community pastures, grazing lands and
forests, wastelands, dumping grounds and threshing
areas, village ponds, rivers and other common pool
wetlands.
37. Horizontally integrated production
Horizontally integrated production has been defined
as ‘the use of unexploited resources derived from
primary aquaculture activities to facilitate the
integration of secondary aquaculture practices.
Horizontal integration has the potential to perform
several important functions, the most valuable being
the assimilation of wastes, reducing discharges to the
receiving environment.
Reducing waste discharges through horizontal
integration will contribute to environmental
protection and reduce the risk of negative feedback
mechanisms.
38. Resource efficient production
The poor resource-base of small-scale farms in developing
countries means that unexploited nutrient sources e.g. crop
by-products, terrestrial weeds; aquatic plants and manure
represent important production enhancing inputs to
fishponds.
Alternative strategies that have evolved to integrate the
production of livestock and aquaculture; manure from
cattle, buffalo, sheep, and poultry has been employed
to enhance production in aquaculture systems.
39. Sustainable seeds supplies
Sustainable access to fry and fingerlings can constitute
a significant constraint to aquaculture development.
Several traditional aquaculture practices evolved based
on the collection of gravid females or seed from the
wild, however, harvest of wild seed was often
unsustainable and unable to support higher
production.
40. RECOMMENDATIONS AND CONCLUSION
Most aquatic wastes come from feeds, to reduce these
wastes, limit the percentage of un-consumed feed in
the culture facility.
To reduce nutrient wastes, Aquaculture effluents
should be monitored and managed, to avoid or reduce
any negative environmental impacts.
In feeding of fishes, the proper feed quantity should be
confirmed, this will reduce the amount of feeds
scattered and loss during feeding.
41. Contin….
Using fishery chemicals correctly The chemical
dosage must the strictly controlled, and the
performance and method of fishery chemical
administration must be correctly known.
Enhancing management level of aquaculture
Implementing rules about aquaculture resource
development, and comprehensively utilizing the
regulations of fishery resource management.
42. Conclusion
Based on the above discussion it may be concluded
that a number of promising technical, social and
institutional approaches with potential to contribute
to low impact aquaculture have been identified and to
some degree tested, however, strategies are required
that promote and support their uptake and where
necessary adaptation. Awareness of promising
approaches to low impact of agriculture and
aquaculture should be promoted amongst target
institutions including national and local government
authorities, extension agents, development
practitioners, educational establishments and
communities that stand to benefits.