This document discusses different types of fishing methods. It begins by defining fishing and fishing equipment. There are two main types of fishing: without gear (hand fishing) and with gear (gear fishing). Fishing methods that use gear include nets, traps, line fishing, fish attraction devices, and electrical fishing. The most common fishing method is net fishing, which accounts for 67% of fishing in India and 54% worldwide. Other major fishing methods include fish screening, fish trapping, and line fishing. The document provides details on specific net fishing techniques like gill nets, purse seines, and trawls. It also describes traps, line fishing, and the use of fish attraction devices.
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Phone: 9010705687
Fishing gears are defined as tools used to capture marine/aquatic resources, whereas how the gear is used is the fishing method.
Fishing is the art of catching fish and other aquatic animals. Many years ago man started using various type of gear used for hunting the terrestrial animals and for fishing also. It is very difficult to say which started first, but some time it is opined that fishing is younger. Reason behind it is easy to catch animals in the land than in the water. In olden days fishing was not having much importance as there was no demand for fish. Earlier fishing was restricted to a particular community but it is not so now. In order to meet the increased demand, fishing is now carried out industrially. Fishing technology not only concerns fishing gear, fishing methods and vessels but also concern Biological and Environmental factors
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Phone: 9010705687
Fishing gears are defined as tools used to capture marine/aquatic resources, whereas how the gear is used is the fishing method.
Fishing is the art of catching fish and other aquatic animals. Many years ago man started using various type of gear used for hunting the terrestrial animals and for fishing also. It is very difficult to say which started first, but some time it is opined that fishing is younger. Reason behind it is easy to catch animals in the land than in the water. In olden days fishing was not having much importance as there was no demand for fish. Earlier fishing was restricted to a particular community but it is not so now. In order to meet the increased demand, fishing is now carried out industrially. Fishing technology not only concerns fishing gear, fishing methods and vessels but also concern Biological and Environmental factors
fish population dynamics, Population structureDegonto Islam
Estimation of fish population dynamics are often based on age structures. Understanding past
population structure is of interest to evolutionary biologists because it can reveal when migration
regimes changed in natural populations, thereby pointing to potential environmental factors such as
climate changes as driving evolutionary forces. Characterizing the structure of extent populations is also
key to conservation genetics as translocation or reintroduction decisions must preserve evolutionary
stable units. Finally, population structure has important biomedical consequences either when a number
of subpopulation groups is locally adapted to particular environmental conditions (and maladapted
when exposed to new environments) or represents a confounding factor in the study of the statistical
association between genetic variants and phenotyp
At what age does a fish attain a maturity
What is the perfect catchable or mark able size of the fish
It helps to calculate the life span and longevity of fish
It enables to estimate and compare growth rates of fish in different waters.
Good or bad growth can point out the suitability for rearing and stocking purposes
The timing of spawning migration of given species can be worked out .
A fishing gear is the tool with which aquatic resources are captured, whereas the fishing method is how the gear is used. Gear also includes harvesting organisms.
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Introduction
Fish Health Management GOALS
Principles of fish health management
Factors affecting fish health
Common symptoms of diseases
General preventive measures
Proper Health Management through Manipulating the disease triangle
Conclusion
References
Traditional fishing Craft of India by Ashish sahuAshish sahu
Fishing crafts are most essential for catching the fish in large scale in water bodies. A large variety of crafts (boats) have been designed for marine and inland fishing in India. The types of fishing crafts of India falls under two general categories. These are Non –mechanized and mechanized fishing crafts.
Based on the topographical variations and difference in habits and habitats of fishing, different types of crafts and gears are used in various inland water system of India. The simplest and most primitive types of craft used for fishing in inland water are the rafts and songas, operated in calm water. In the larger rivers and estuaries subject to strong current and tidal movement, sturdier plank boats are used.
Definition
Fishing vessel is a floating device used for fishing activities like, fishing, fish transportation, Research and training purpose.
Various parameter have been used by different authors for classification of fishing gear and fish catching methods. According to Hardy (1947) - Hardy best his classification on fishing method like luring, snaring and attacking.According to Umali (1950)- Umali classified fishing gear of Philippines as non-textile device and textile device.According to Davis (1958) – Davis made an effort to classified gears of England without drawing definite line of demarcation.According to Dumont and Sundstrom (1961) – commercial fishing gears of united state where classified based on similarity of types.According to Andres Von Brandt (1972) – Von Brandt classified the fish catching methods of the world on the basis of how the fish are catch. The subgroups of Von Brandt 1972 classification are made on parameter like material construction and method of operation. International Standard Statistical Classification of Fishing Gear (ISSCFG-1980) has classified the fishing gear in accordance with the internationally recognized standard Von Brandt 1972 classification is the most popular one and is universally accept.Andres Von Brandt has classified is fish catching methods of the world in to 16 major groups based on how the fish are caught.
Fishing gears
Dredges.
Gillnets and similar nets.
Hooks and lines.
Pots and traps.
Seines.
Surrounding nets and lift nets.
Trawls.
Data sources.
Fishing gears are commonly classified into two main categories: passive and active. This classification is based on the relative behavior of the target species and the fishing gear.
Almost any equipment or gear used in fishing can be called fishing tackle, examples being hooks, lines, baits/lures, rods, reels, floats, sinkers/feeders, nets, stringers/keepnets/live wells, spears, gaffs, traps, waders, and tackle boxes, as well as any wire, snaps, beads, spoons, blades, spinners, clevises and tools
fish population dynamics, Population structureDegonto Islam
Estimation of fish population dynamics are often based on age structures. Understanding past
population structure is of interest to evolutionary biologists because it can reveal when migration
regimes changed in natural populations, thereby pointing to potential environmental factors such as
climate changes as driving evolutionary forces. Characterizing the structure of extent populations is also
key to conservation genetics as translocation or reintroduction decisions must preserve evolutionary
stable units. Finally, population structure has important biomedical consequences either when a number
of subpopulation groups is locally adapted to particular environmental conditions (and maladapted
when exposed to new environments) or represents a confounding factor in the study of the statistical
association between genetic variants and phenotyp
At what age does a fish attain a maturity
What is the perfect catchable or mark able size of the fish
It helps to calculate the life span and longevity of fish
It enables to estimate and compare growth rates of fish in different waters.
Good or bad growth can point out the suitability for rearing and stocking purposes
The timing of spawning migration of given species can be worked out .
A fishing gear is the tool with which aquatic resources are captured, whereas the fishing method is how the gear is used. Gear also includes harvesting organisms.
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Introduction
Fish Health Management GOALS
Principles of fish health management
Factors affecting fish health
Common symptoms of diseases
General preventive measures
Proper Health Management through Manipulating the disease triangle
Conclusion
References
Traditional fishing Craft of India by Ashish sahuAshish sahu
Fishing crafts are most essential for catching the fish in large scale in water bodies. A large variety of crafts (boats) have been designed for marine and inland fishing in India. The types of fishing crafts of India falls under two general categories. These are Non –mechanized and mechanized fishing crafts.
Based on the topographical variations and difference in habits and habitats of fishing, different types of crafts and gears are used in various inland water system of India. The simplest and most primitive types of craft used for fishing in inland water are the rafts and songas, operated in calm water. In the larger rivers and estuaries subject to strong current and tidal movement, sturdier plank boats are used.
Definition
Fishing vessel is a floating device used for fishing activities like, fishing, fish transportation, Research and training purpose.
Various parameter have been used by different authors for classification of fishing gear and fish catching methods. According to Hardy (1947) - Hardy best his classification on fishing method like luring, snaring and attacking.According to Umali (1950)- Umali classified fishing gear of Philippines as non-textile device and textile device.According to Davis (1958) – Davis made an effort to classified gears of England without drawing definite line of demarcation.According to Dumont and Sundstrom (1961) – commercial fishing gears of united state where classified based on similarity of types.According to Andres Von Brandt (1972) – Von Brandt classified the fish catching methods of the world on the basis of how the fish are catch. The subgroups of Von Brandt 1972 classification are made on parameter like material construction and method of operation. International Standard Statistical Classification of Fishing Gear (ISSCFG-1980) has classified the fishing gear in accordance with the internationally recognized standard Von Brandt 1972 classification is the most popular one and is universally accept.Andres Von Brandt has classified is fish catching methods of the world in to 16 major groups based on how the fish are caught.
Fishing gears
Dredges.
Gillnets and similar nets.
Hooks and lines.
Pots and traps.
Seines.
Surrounding nets and lift nets.
Trawls.
Data sources.
Fishing gears are commonly classified into two main categories: passive and active. This classification is based on the relative behavior of the target species and the fishing gear.
Almost any equipment or gear used in fishing can be called fishing tackle, examples being hooks, lines, baits/lures, rods, reels, floats, sinkers/feeders, nets, stringers/keepnets/live wells, spears, gaffs, traps, waders, and tackle boxes, as well as any wire, snaps, beads, spoons, blades, spinners, clevises and tools
Trawl nets and bottom seines possess an initial selectiveness owing to their particular design and mode of operation. A mesh size limitation would vary considerably in effect from one type of trawl net to another. It is important therefore to consider gear selectivity and performance before we begin to think of mesh sizes and their effect.
Take a herring vinge trawl for example and two other bottom other trawls like the granton trawl and the shrimp trawl. All use otter boards, all are on the sea bed throughout the duration of the tow and all have the same basic structure of wings, square, bellies, bag and cod end. But their performances differ as much as those of a racing car, a truck and a tractor. All three nets could be fishing in the same area, yet the vinge trawl might take only herring, the granton trawl only demersal fish and the shrimp trawl primarily shrimp or prawn. Mesh size has little to do with this species selection. It is a function of other aspects of gear performance - speed of tow, headline height, ground contact, flow of water through the body of the net, otter door spread, length of ground-cables, and so on. The vinge trawl would have the smallest mesh in the cod end, yet it would take no cod, haddock or shrimp. The shrimp or prawn trawl would have a smaller mesh than the granton trawl yet it would capture only a small proportion of the bigger fish the granton trawl would take. To imagine that in these cases the size of mesh controls the size of fish caught would be as simplistic as to think that the respective speeds of the racing car, truck and tractor were determined by the size of their wheels.
In contrast to the trawls designed to capture one species or group of species, there are the multi-species trawls or combination trawls which take a great variety of fish. The North Sea prawn and fish trawl is a combination net designed to capture Nephrops norvegicus or Norway prawns, plus demersal fish like cod, haddock, skate, monks, plaice and lemon sole. Most bottom trawls in the tropics and sub-tropics are multi-species trawls taking fish which vary greatly from each other in size and shape. There is no common selectivity factor and no common minimum size or length for the various species. For these fisheries, a mesh regulation is at best an inadequate means of reducing juvenile mortality. It can be aimed only at the smallest of the main commercial species.
Gill net
Trawl
Purse seine net
Hooks and lines
TED (turtle exclusion devices)
Non-conventional fishing methods:
light fishing; hose pipe fishing; electric fishing.
Pelagic (surface/open ocean) gillnets are systems of netting with highly specific mesh sizes. Gillnets as long as 2.5km, are placed vertically in the water column with the use of buoys and weights. These nets may be anchored or allowed to drift with prevailing currents, intercepting migrating sharks and fishes such as tuna and mackeral. Large fish become entangled or gilled in the net (commonly around the gills), whilst smaller fish are able to pass through the designated mesh size.
Trawling is the operation of towing a net to catch fish, and the basic requirements for operating the trawl-net are sufficient power to tow the net , a means of holding the mouth of the net open while towing, a system of wires to connect the net and gear to the source of towing power and the ability to cast and haul the net .
This Is a Useful PDF describing various Fishing informatio, fishing terminology and fishing techniques, which will hopefully make it easier for yyour hatteras fishing experience!
http://hatterasfishingreport.com/
Eco-Friendly Fishing Lures: One of the best ways to practice sustainable fishing is to use biodegradable fishing lures. Since rubber doesn’t break down, in the water or in a fish’s stomach, a good substitute is biodegradable plastic that will dissolve over time. An added perk to these eco-friendly options is that the soft lures can be made in all colors and designs to attract your target fish just as effectively as traditional lures.
Eco Fishing Weights: Not only is lead toxic to humans, but it’s dangerous for fish as well, causing both physical and behavioral changes. That’s why many manufacturers today produce sinkers made from safer materials that will cause less damage if ingested or left in the water. Some common substitutes used in non-toxic weights are brass, steel, tungsten or tin. You’ll also want to make sure they’re chip resistant to prevent paint loss in the water. And remember that while these variations may be a little more expensive than lead lures, the benefits outweigh the costs.
Eco Fishing Line: Like lures, anglers today can opt for biodegradable monofilament line fishing line that breaks down faster yet still has the same performance characteristics as regular line. Even if you don’t have biodegradable line, you can take steps to properly dispose of your traditional line to reduce your impact on the environment. For example, many bait shops, fishing access points, piers and other spots have designated collection bins for discarded monofilament and fluorocarbon fishing line.
Other Eco Fishing Tackle and Equipment: Anglers have several other eco-friendly options nowadays. For example, when you’re choosing hooks, opt for circle hooks instead of J-hooks to minimize internal damage if you’re practicing catch and release. Look for rigs made of materials like glass beads. Pick knotless nets. Instead of using fresh bait collected from fish habitats, choose artificial. And when you’re picking out other gear like waders, bags or boxes, look for those made from recycled materials.
ECO-FRIENDLY ANGLING
Beyond fishing gear, there are other ways to practice eco-friendly fishing. If you catch and release, in addition to choosing barbless circle hooks, be sure to use the right eco-friendly fishing lures for the species to avoid exhausting the fish, keep your catch wet and limit the time the fish stays out of the water to increase the chance of survival.
It’s also important to pay attention to the area around you. Take your trash with you to prevent fish and other wildlife from eating or getting caught in your rubbish. If you’re boating, consider rowing or paddling a canoe rather than a motorized choice. If you do go in a power boat, be careful when you’re navigating over fragile habitats and be careful to prevent fuel spills.
Spearing, Harpooning and Shooting fish.pptxMurabiyaUdit
In very old age time there are not that much development in fishing technology. The fishing spear its simplest form and it is the fisherman’s most primitive gear. The range and capacity of humans to seize living fish by some means from a distance, is limited by the length of his arm. Harpoons are widely used in fisheries.
This gear has replaced the older spears in many instances and is used in large fishing, small scale fishing and in sport fishing
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
3. Introduction
The catching of fishes by equipments or
without equipment called “Fishing”.
In the fishing time, those equipments which
are use in fishing known “Fishing Unit”.
From the starting of fishing and up to delayed
the fishing process are called “Fishing Cycle”.
4. Principal of Fishing
Fishing are based on the three basic
thinks -:
1) Type of fishes
2) Nature of water body
3) Weather
5. Fish Gear
Those equipments which are used in fishing
called “Fish Gear”.
Fish gears like as -: Different type of net,
Traps, Hooks etc.
6. Method of Fishing
On the basis of use of gear, fishing are of basic
two types -:
1) Fishing without gear (Hand Fishing)
2) Fishing by gear (Gear Fishing)
7. Fishing by Gear
1) Fish Screens
2) Fish Traps
3) Line Fishing
4) Net Fishing
5) Fish Attraction Devices (FADs)
6) Electrical Fishing
8. Fish Screens
The screen are set to surrounded a shallow tidal
area at the time of high floods. When the flood
water recedes the fish are left behind in the
muddy pool and are collected.
Screen are also set to mark off shallow areas of
river.
By this method is employed to catch Carps,
Catfish, Murrells etc.
10. Fish Traps
Various type of traps are used to catch of fish
which are allowed and prevent from escaping of
fish.
It is also called as Cover-pot or Basket trap.
A large number of fisherman are together in
muddy water by this method.
Live fishes like : Channa, H. fossilis, Clarias
batrachus are easily catch by trapping.
12. Hooks & Line Fishing
Long-lining is one of the most fuel-efficient catching
methods.
This method is used to capture all type of fishes and also
able to perform in Rivers, Sea, Ponds, Lacks, Pools etc.
The lines may be set vertically in the water column, or
horizontally along the bottom.
The size of fish and the species caught is determined by
hook size and the type of bait used.
13. Types of Lining Fish Catching
Lining is a modern fishing method. Modern fishing lines are usually
made from artificial substances.
Lining method are basically divided into three types -:
1) Droplining - A Dropline usually shorter than longlines and
have fewer hooks. Droplines have a weight at the bottom and a float
at the top.
2) Handlining - It is a single fishing line method by a single
person. Handlining can be done from boats or from the shore.
3) Longlining - is a commercial technique that uses a long
heavy fishing line with a series of hundreds or even thousands of
baited hooks hanging from the main line by means of branch lines
called "snoods". Longlines are usually operated from specialised boats
called longliners.
15. Net Fishing
Netting is the principal method of commercial fishing.
The most common form of fishing for recreational
fishers is “net” called netting. It is mostly used by
commercial fisherman to catch fish in large scales.
While there are many types of nets, all rely on the fish
getting snared or caught in the net's mesh. Nets are
typically long, narrow and flat, weighted at the bottom
edge and supported at the top edge by floats.
16. Types of Net
1) Dip net or Lift net
2) Cast net
3) Purse net
4) Drag net
5) Shore sienes or Rampani net
6) Trawl net
17. Dip Net or Lift Net
Dip net are formed in a several shapes like : square
or rectangular, triangular, etc.
Dip net lowered into the water in the hope that
fish would swim over them and lifted out of water.
Lift nets can be categorized into four names -:
1) Hela Jal
2) Kharra Jal
3) Bhesal Jal
4) Khoursal Jal
19. Cast Net
It is also called “Ghagaria Jal”.
It is a circular net which is looks like the umbrella
shape.
It is extensively used in ponds and rivers and all
along the sea coast.
It is can’t be used in weedy place or rocky bottom
place.
21. Purse net
It is a purse shaped net and operated from a boat.
The net is then "pursed", drawing the bottom closed
and entrapping the fish.
Purse nets cannot be used by recreational fishers.
Two kinds of purse net are used to catching fishes-
1) Kharki Jal
2) Shangla Jal
24. Drag net
Drag net are used in a large skills in fishing.
Drag net are categorized in two types -:
1) Gill Net
2) Drift Net
25. GILL NET
It is also known “Fixed Net”.
Gill nets are walls of netting which may be set at or below
the surface, on the water bed, or at any depth in between.
Gill netting is probably the oldest form of net fishing,
having been in use for thousands of years.
Netting is almost invisible, fish swim right into it; and their
gills get caught
Different type of gill net are make for the caught of
different kinds of fishes.
28. DRIFT NET
• Large floating nets
• Unbreakable and invisible to most sea species
• likely to entangle large pelagic species : dolphins,
whales, sharks, turtles, and rays.
• Driftnets have earned the nickname “walls of
death”.
• These nets which are not anchored.
31. Shore sienes or Rampani net
Rampani nets are a wall of net divided into three
layers.
An inner fine-meshed net is sandwiched between
two outer, larger meshed nets.
Rampani Net are also two types -:
1) Fixed Rampani Bag Net
2) Moveable Rampani Net
33. Trawl Net
It is very efficient net for capturing bottom
fishes.
Trawl net is the conical bag like structure.
This net are of two types -:
1) Beam Trawl
2) Otter Trawl
36. Fish Attraction Devices
Various species of fish often associate with
other living creatures.
e.g. tuna associate with dolphins and whale
sharks.
Some associate with objects floating or
suspended in the sea.
This natural phenomenon has been
exploited to attract fish to floating or
suspended structures.
37. Fish Attraction Devices
Such structures can provide known locations for
congregating fish, around which vessels can
operate a wide range of fishing techniques
including purse seines, pole and line or trolling
FADs may be used to concentrate fish in
sufficiently high numbers which are then
surrounded with a purse seine net.
38. Use of explosives (dynamite)
or
poisons (sodium cyanide, bleach)
Dynamite fishing : In some countries such as the
Philippines, explosives (dynamite or blast
fishing) are used on coral reefs to capture fish.
Blast fishing is a particularly destructive method
of fishing and is prohibited in many regions.
39. ELECTRICAL FISHING
Electric fishing is a new technique has been
developed by using of low voltage electric current.
The fish always swim towards the positive pole of
electric current and electrode with increasing
potential.
The advantage of this method is that even the large
size of fishes which escape being caught by taking
shelter under stones, rocks etc., can be easily caught.
40. Fishing method, according to their use in
fish catching in INDIA as well as World
S.N. Fishing Methods In INDIA In WORLD
1. By net fishing 67.00% 54.00%
2. By fish screening 11.00% 17.50%
3. By fish traping 12.00% 12.50%
4. By line fishing 09.50% 14.00%
5. By FAD’s 00.40% 01.50%
6. By electrical
fishing
00.10% 00.50%
41. Graphical Representation of Fishing method’s, according to
their use in fish catching in INDIA as well as World
0%
10%
20%
30%
40%
50%
60%
70%
80%
By Net Fishing By Fish Screening By Fish Traping By Line Fishing BY FAD's By Eletrical Fishing
In India
In world