Almost all natural bodies of water bear fish life, the exceptions being very hot thermal ponds and extremely salt-alkaline lakes such as the Dead Sea and Great Salt Lake. The fishes belong to the most numerous and diversified group among vertebrates. They dominate the water bodies of the world through a variety of morphological, physiological and behavioral adaptations. They have been in existence for more than 450 million years. A total of 24618 species of fishes belonging to 482 families and 4258 genera have so far been described. About 58% of the fish species are marine while 41% are freshwater inhabitants and 1% migrants. In our Indian region alone, there are 2,500 species of which 930 are inhabitants of freshwater and the rest live in the seas. In other words, India harbours 11.5% of the fish fauna so far known in the world. There are over 800 living species of sharks and rays, 30 species of chimaeras and ratfishes, 6 species of lung fishes, 1 species of coelacanths, 36 species of long ray finned bichirs, sturgeons and paddlefishes. The Neopterygii are the rest of the known species of modem fishes. All these fishes inhabit various niches in the aquatic environment. The diversified habitats of fishes include open oceans, deep oceanic trenches, nearshore waters, saline coastal embayments, brackishwaters, estuaries, intermittent streams, tiny desert springs, vernal pools, cold mountain streams, lakes, ponds, etc.
Modern developments in transport technology are from two levels; one is from an understanding of internal physiological mechanisms of the fish and the optimal requirements, ensuring maximum survival of fish under transport and the other is from a study of the environmental parameters of the medium in which fish are transported. Under anaesthesia fish can be transported without water even, provided the skin and gills are kept moist under low temperature. The cryopreservation of fish sperm for use at any convenient time can be referred to here, though this would concern seed production more directly than live seed transport.
Almost all natural bodies of water bear fish life, the exceptions being very hot thermal ponds and extremely salt-alkaline lakes such as the Dead Sea and Great Salt Lake. The fishes belong to the most numerous and diversified group among vertebrates. They dominate the water bodies of the world through a variety of morphological, physiological and behavioral adaptations. They have been in existence for more than 450 million years. A total of 24618 species of fishes belonging to 482 families and 4258 genera have so far been described. About 58% of the fish species are marine while 41% are freshwater inhabitants and 1% migrants. In our Indian region alone, there are 2,500 species of which 930 are inhabitants of freshwater and the rest live in the seas. In other words, India harbours 11.5% of the fish fauna so far known in the world. There are over 800 living species of sharks and rays, 30 species of chimaeras and ratfishes, 6 species of lung fishes, 1 species of coelacanths, 36 species of long ray finned bichirs, sturgeons and paddlefishes. The Neopterygii are the rest of the known species of modem fishes. All these fishes inhabit various niches in the aquatic environment. The diversified habitats of fishes include open oceans, deep oceanic trenches, nearshore waters, saline coastal embayments, brackishwaters, estuaries, intermittent streams, tiny desert springs, vernal pools, cold mountain streams, lakes, ponds, etc.
Modern developments in transport technology are from two levels; one is from an understanding of internal physiological mechanisms of the fish and the optimal requirements, ensuring maximum survival of fish under transport and the other is from a study of the environmental parameters of the medium in which fish are transported. Under anaesthesia fish can be transported without water even, provided the skin and gills are kept moist under low temperature. The cryopreservation of fish sperm for use at any convenient time can be referred to here, though this would concern seed production more directly than live seed transport.
Exotic fish introduction to india and their impact on indigenous speciesAshish sahu
The exotic varieties of fish have been found to encroach the natural water bodies and adversely affect the indigenous fish species. ... Owing to extensive practice of composite culture, three fast growing exotic fishes are introduced along with the three Indian major carps.
Fish Tagging methods used to monitor fish populations are movement mapping, or tracking, and mark and recapture. Tracking is a process in which marine biologists and resource managers use technology to tag fish and map their movements.
In aquatic animals such as fish respiration takes place through special respiratory organs called gills, however lung fish respiration takes place through lungs. Gills are present on both the sides of the head of fish. The gills are covered by gill covers also called operculum. When the fish open its mouth, water is drawn into the buccal cavity and passed through the gills. The gills contain special type of cells that absorb the oxygen present in water. The absorbed oxygen is then supplied to all the cells of body through blood. In the cells, oxygen is converted into carbon dioxide and returned back to gills through blood. Ultimately, the gills release the carbon dioxide in water passing through them.
Respiration in Fish
The gills of fish are very efficient; it is estimated gills can extract about 80% oxygen dissolved in water. In addition to the respiratory organs, the gills have an important role in maintaining the right balance of salts in the body.
lobsters and crab fisheries in INDIA is a vast and enormous amount of catch and exports are being made.
this slide describes about the methods, distribution, annual landings and important species of lobster and crabs in India.
Fish has a air bladder system ,its a sac containing gas especially air .it provide buoyancy to the fish and help them to stay and swim in water current swimming. It include air bladder and its function and also focus to weberian ossicles and its function.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
Exotic fish introduction to india and their impact on indigenous speciesAshish sahu
The exotic varieties of fish have been found to encroach the natural water bodies and adversely affect the indigenous fish species. ... Owing to extensive practice of composite culture, three fast growing exotic fishes are introduced along with the three Indian major carps.
Fish Tagging methods used to monitor fish populations are movement mapping, or tracking, and mark and recapture. Tracking is a process in which marine biologists and resource managers use technology to tag fish and map their movements.
In aquatic animals such as fish respiration takes place through special respiratory organs called gills, however lung fish respiration takes place through lungs. Gills are present on both the sides of the head of fish. The gills are covered by gill covers also called operculum. When the fish open its mouth, water is drawn into the buccal cavity and passed through the gills. The gills contain special type of cells that absorb the oxygen present in water. The absorbed oxygen is then supplied to all the cells of body through blood. In the cells, oxygen is converted into carbon dioxide and returned back to gills through blood. Ultimately, the gills release the carbon dioxide in water passing through them.
Respiration in Fish
The gills of fish are very efficient; it is estimated gills can extract about 80% oxygen dissolved in water. In addition to the respiratory organs, the gills have an important role in maintaining the right balance of salts in the body.
lobsters and crab fisheries in INDIA is a vast and enormous amount of catch and exports are being made.
this slide describes about the methods, distribution, annual landings and important species of lobster and crabs in India.
Fish has a air bladder system ,its a sac containing gas especially air .it provide buoyancy to the fish and help them to stay and swim in water current swimming. It include air bladder and its function and also focus to weberian ossicles and its function.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
Migration in fish including different types of movements, types of migration, physiological changes during migration and challenges during navigation is shared in the presentation. it is useful for the students studying ichthyology at PG level.
Locomotion in fishes has been classified into three types: Anguilliform or ...RirisLindiawati
Locomotion of fishes means movement of fishes for their survival .
It provides a number of interesting information to the Ichthyologists.
The knowledge of the different methods of locomotion is yet not fully understood because fishes in aquaria or somewhere else other than their natural inhabitation tend to behave in a manner somewhat different from the normal.
Catadromous migration: The movement of large number of individuals from fresh water to sea water, generally for spawning as happens in the case of eels.
Anadromous fishes live and feed in ocean waters but their spawning grounds lie in the tributaries of rivers.
Palestine last event orientationfvgnh .pptxRaedMohamed3
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Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
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In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. Introduction
Migration - The movement of large number of
animals from one place to another for various
reasons like
1. Food Gathering
2. Breeding
3. Temperature Adjustments
3. Causes
I. To avoid unfavorable conditions
II. To enhance the survival of offspring's
III. To exploit the available food in feeding areas
IV. Population pressure (competition and
predation)
4. Types of Migration
SPAWNING MIGRATION
DIADROMOUS
ANDROMOUS CATADROMOUS
POTAMODROMOUS OCEANODROMOUS
From sea
water to
Fresh water
From fresh
water to
sea water
From one
freshwater
habitat to
another fresh
water
From sea
water to
sea water
5. • Diadromons fishes – migrate between sea
& fresh water
– Anadromous – major part sea but fresh water
during breeding season e.g. Salmon & Hisla
– Catadromous – major part fresh water but sea
during breeding e.g. Anguilla (eel fish)
– Amphidramons – fresh water to sea & vice
versa. Eg. Gobies
• Potamodromons – migratory, confined to
fresh water eg. Corps and trouts, Mahasees
move up stream along Himalaya rivers
• Oceanodromons – migratory, confined to
sea only eg. Tunnas, Mackerels
6. Causes of migration in fishes
Heape (1961) – 4 primary reasons of fish migration
Gametic migration (Spawning/breeding migration)
◦ Better survival & proper development of egg/larva
◦ Stop feeding prior to migration or reduced drastically
◦ Energy requirement (fat deposit) e.g. Chum salmon spp. 25,810 Ca &
28,390 cal by male and female respectively
Alimental of Feeding Migration
◦ Due to shortage of food (Suitable/wintering/spawing)
◦ Better food facilities, better survival & fast growth
◦ Grow fast in size & mature & produce more eggs.
Climate or Wintering Migration
◦ Due to inactive physical condition and low BMR (Basic Metabolic rate)
◦ Depends on fish condition and environment
◦ Achieved by hormonal and physiological changes
◦ Deposit mainly as fat deposits
◦ Among freshwater species (Grass corp.) more to wintering grounds.
Osmoregulatory or Protective Migration
◦ Spwing, feeding & wintering migration can all be regards as protection
migration as they ensure further life of fish
◦ These migration are not cyclical
9. Anadromous
• Fishes which migrate from the sea into fresh water to
spawn
‘OR’
• Ones which stay entirely in sea water and migrate
upstream to spawn
• An Anadromous fish, born in fresh water, spends most
of its life in the sea and returns to fresh water to spawn
• Adults usually die after spawning
• Their adaptations to conditions of different habitats are
particularly with regard to salinity of the water
• Common examples - Salmon, Trout, Hilsa, striped bass,
Sea lamprey and sturgeon
10. Anadromous adaptations by salmon
• Salmon hatch in small freshwater streams
• From there they migrate to the sea to mature (1
to 5 years)
• When mature, the salmon return to the same
streams where they were hatched to spawn, this
homing behaviour has been shown to depend on
olfactory memory
• Salmon are capable of going hundreds of
kilometres upriver, and humans must install fish
ladders in dams to enable the salmon to get pass
12. Death
Egg
Alevin
Fry
Parr
Smolt
Adult
Spawner
SPAWN IN
Redd
Spawning beds in FW
Adults change
significantly once they
enter freshwater. They
change color, stop
eating, males develop a
kype (hooked jaw), and
they stop drinking
Entering fresh water
After spawning spawners die
Average number of eggs
deposited per female is
around 3,000 eggs,
Remain in the gravel for
another 1-2 months, yolk sac
2-3 months for hatching
Young free-
swimming, 1-2
inches, learn to
feed
2-5 inches, Parr marks, As
salmon mature into a smolt,
the Parr marks disappear
When salmon prepare
to migrate from
freshwater to the
ocean, they become
smolts, spend some
time in estuaries
before heading to
the ocean
Salmon spend 1-5
years in the ocean,
80% of their life cycle
Entering into Sea water
14. CATADROMOUS
• Catadromous fishes are ones which migrate
from fresh water into the sea to spawn
‘OR’
• Ones which stay entirely in fresh water and
migrate downstream to spawn
• Best examples - eels of the genus Anguilla,
numbering 16 species, the best-known of
which are the North American eel (A. rostrata)
and the European eel (A. anguilla)
15. Cont’d…
• It travels several thousand km starting from rivers
reaching spawning grounds in sea
• After spawning adults die
• Larvae of eel drift from spawning grounds, takes
several months to 3 years, to reach river &
undergo metamorphosis to become adults
• Young ones are born in the ocean, mature in
freshwater or estuarine habitats, and return to
the ocean to spawn
• This makes them Catadromous fish
19. POTAMODROMOUS
• Truly migratory fishes
• The movement is confine to fresh water
• Some examples- carps, trouts, catfishes etc.,
• Travels long distances in rivers to locate
suitable spawning grounds (Some migrates
Upstream and some downstream)
• After laying eggs, the parents return to the
feeding area as food is available only for the
young ones & cannot support the adults
20. Cont’d…
• Besides spawning needs, this type of
migration may also be due to competition
• Such as increase in population,
• Scarcity of food may also force fishes to
migrate other places, where food is abundant
22. OCEANODROMOUS
• These are truly migratory marine fishes
• Travel long distances with in sea to spawn & return to
the feeding areas
• There are no barriers within the sea and fishes have
learned to migrate in order to take advantage of
favourable conditions wherever they occur
• They differ mainly from one another by the extent of
their migration
• Examples- Mackerels, Tunas, Cod, Herrings, etc.,
• During migration these species visit spawning areas,
nursery areas, feeding areas, winter area etc.,
23.
24. Showing pattern of movements in
Oceanodromous fish migration
Spawning
area
Nursery
area
Feeding
area
Winter
area
Winter
area
Feeding
area
Recruitment into
Adult population
25. Migration of Herring
• Herrings are found in the North Atlantic and
North pacific Oceans, and exhibit seasonal
migration covering a large
• Also undertake daily vertical migration (short
distance and for food)
• Also undertakes annual spawning migration
to the spawning ground near the coast (during
this they do not exhibit vertical migration)
26. Cont’d…
• After spawning , the larvae drift along the
water current to wintering area near the
coast, where they feed and grow
• On becoming adult, they join the older fish in
migration cycle
• And return to spawning area when mature
• This takes 4-6 years
27. Factors influencing migration
Influenced by several Physical, Chemical, and
Biological factors
Physical factors
Temperature
Light intensity
Photoperiod
Water current
Turbidity
depth
Temperature is of more importance,
in sea water rise in temperature
provides stimulus to Salmon for
Migration.
In fresh water temperature rise
fishes moves upstream for
spawning
28. Chemical factors
Chemical factors
pH
Salinity
Odour
Taste of water
Salinity of water restricts the movement of fishes.
Freshwater species are stenohaline (intolerant to large salinity changes).
Hence they remain confined to fresh water do not undertake migration involving long
distances
But some species like Salmon, Hilsa, Anguilla etc., are euryhaline and can adjust to
large salinity variations i.e. Diadromous fishes
29. Biological factors
• Biological factors
Food
Memory
Stage of sexual maturity
Predators and competitors
Hormones
Availability of food is the primary factor for the survival of juveniles
Memory guides some species during migration e.g. Salmon returns to the same
area of river for spawning, where its own hatching & development took place
30. Role of Hormones
• Observed in Diadromous fishes
• The osmo - and ionic regulation in these species
is controlled by Hormones such Prolactin,
Corticotrophin, growth Hormone, etc., secreted
by the pituitary gland
• Prolactin is the most important hormone that
acts on gills, skin, kidney, urinary bladder and the
intestine and influence the water and ion
regulation
• It also reduces the loss of Na ions in the fresh
water fishes (Eel)
31.
32. • Fish ways commonly called fish ladders but also known as fish passes.
• Definition :
A fish ladder (or fish way , fish pass) is a structure designed to allow
fish the opportunity to migrate upstream over or through a barrier to fish
movement.
• In Australia also referred to as fish steps.
33. In 1852–1854, the Ballisodare Fish Pass was built in County Sligo,
Ireland, to draw salmon into a river that had not supported a fishery.
In 1880, the first fish ladder was built in Rhode Island on the Pawtuxet Falls
Dam.
34. • Natural: In this type of fish passes the approach routes of fish may be
strengthened with concrete to the natural rock with the natural rock with the
object of concentrating flows previously diffuse, reducing turbulence and
deepening pools.
35. • The Pool design (Fish ladder) : It consists of a series of pools arranged in a ladder-
like manner from downstream to upstream. The flow of water from pool to pool
may be over solid obstacles or through passages between obstacles or a
combination of two types. Each pool is designed in such a way that it provides
adequate resting grounds for the ascending fishes.
36. Pool-Weir Fish way
The oldest styles of fish ladders.
Series of small dams and pools of regular length.
Effective for jumping fish.
Create a long, sloping channel for fish to travel around
the obstruction.
Fish must jump over from box to box in the ladder.
37. Flows.
Energy dissipation.
Resting areas.
Drop between pools (fish way slope).
Attraction velocities.
Entrance locations.
Space in pools.
38. • The Deniel design: It is a narrow channel with closely spaced baffles set at
an angle with the axis of the channel. In this kind of fish way, the force of
fast flowing water is minimized and fishes can negotiate them easily.
39.
40. The same principle as Denil fish ways.
Use many baffles to simulate a rapids to a fish and present
the fish with many options with respect to water speeds.
•
Narrower than Denil fish ways.
Made up of any metal.
Work best at small barriers where inexpensive passage is
needed.
41.
42. vertical-slot fish passage
Allows fish to swim upstream without leaping
over an obstacle.
Tend to handle reasonably well the seasonal
fluctuation in water levels on each side of the
barrier.
Used by all types of migrating fish.
43. FISH LOCK
• The Fish lock: It is an arrangement for the
regulation of flow of water with the help of
mechanical gates. The inflow and outflow can
be regulated thus providing fishes with the
passage to move either way.
44. Simple sluice or inclined chute
• Simple sluice or inclined chute: The chute is
an inclined channel or a sort of waterfall with
deep descent. The effective width of the
channel is actually much less than the width
of sluice and many sharp turns cause cross
currents that are very difficult to be
counteracted by large fishes.