MIGRATORY FISH IN THE WORLD & IN THE BANGLADESH & THEIR POSSIBLE MIGRATORY ROUTE

1. MIGRATORY FISH IN THE WORLD & IN
THE BANGLADESH & THEIR POSSIBLE
MIGRATORY ROUTE

2. INTRODUCTION

 Migration, in ethology, the regular, usually seasonal,
movement of all or part of an animal population to
and from a given area. Familiar migrants include in
East Africa and in the Arctic tundra; bats; whales
and birds; seals; and fishes, such as salmon.
 Migration can be contrasted with emigration.
 The migration cycle is often annual and thus closely
linked with the cyclic pattern of the seasons.
 The distance traversed may be a few miles or several
thousands of miles.

3. CLASSIFICATION:

 Three types:
 Anadromous fishes are ones which migrate from the sea into
fresh water to spawn (e.g. salmon),; or, ones which stay entirely in
fresh water and migrate upstream to spawn.
 Catadromous fishes are ones which migrate from fresh water into
the sea to spawn (e.g. salmon),; or, ones which stay entirely in
fresh water and migrate downstream to spawn.
 Diadromous refer to all fishes which migrate between the sea and
fresh water. These included:
 amphidromous (fishes which migrate from fresh water to the seas,
or vice versa, but not for the purpose of breeding),
 potadromous (fishes whose migrations occur wholly within fresh
water), and
 oceanodromous (fishes which live and migrate wholly in the sea).

4. 
STATE:
 There are about 8 000 species of fish which live in
freshwater and
 About 12 000 which live in the sea; and
 There are about 120 species which move regularly
between the two (Cohen, 1970).

5. LIST OF FRESH WATER MIGRATORY SPECIES IN BANGLADESH & IN THE WORLD:
Fish Base
name
Species Distribution Migratory status
Knifetooth
sawfish
Anoxypristis
cuspidate
Australia,Bangladesh,China,India,Indonesia,Malaysia,
Myanmar, Oman, Pakistan, Papua New Guinea,
Philippines, Singapore, Somalia, Sri Lanka, Thailand,
Anadromous
Largetooth
sawfish
Pristis
microdon
Australia, Bangladesh, Cambodia, India,
Indonesia,Malaysia,Mozambique,Myanmar, Papua
New Guinea, Philippines, South Africa, Sri Lanka,
Thailand
Anadromous
Smalltooth
sawfish
Pristis
pectinata
Angola, Australia, Bangladesh, Belize, Benin, Brazil,
Cameroon, Cape Verde, Colombia, Cuba, Dem. Rep.
of the Congo, Congo, Cote d'Ivoire, Ecuador, (France
Guyana, Réunion), Equatorial Guinea, French Guiana,
Gabon, Gambia, Ghana, Guinea, Guinea Bissau,
India, Indonesia, Israel, (Spain – Canary Islands), Sri
Lanka, South Africa, Suriname, Syrian Arab Rep,
Thailand, Trinidad & Tobago, United Rep. of
Tanzania, Togo, United Kingdom (Bermuda,
Gibraltar), USA, Venezuela, Western Sahara
Anadromous
Large-tooth
sawfish
Pristis
perotteti
USA (Texas (historically), Louisiana, and occasionally
south Florida), Mexico, Belize, Guatemala, Honduras,
Nicaragua, Costa Rica, Colombia, Venezuela,
Caribbean Sea, Mediterranean Sea. Present reported
range: Senegal, Gambia, Sierra Leone, Liberia, Ivory
Coast, Congo, Democratic Republic of Congo and
Angola.
Anadromous

6. LIST OF ATLANTIC HIGHLY MIGRATORY PELAGIC
FISHERIES
Species/stocks Major Ocean area Migratory status
Albacore (T. alalunga) Northern Pacific Ocean
Southern Pacifc Ocean
Mediterranean Sea
Northern Atlantic Ocean
South Atlantic Ocean
Indian Ocean
Oceanodroumous
Eastern Pacific Ocean
Western and Central Pacific
Ocean
Atlantic Ocean
Indian Ocean
Oceanodroumous
Bigeye tuna (T. obesus)
Pacific bluefin tuna (T.
orientalis)
Pacific Ocean
Atlantic bluefin tuna (T.
thynnus)
East Atlantic and
Mediterranean Sea
West Atlantic Ocean
Oceanodroumous

7. LIST OF MIGRATORY SHARK SPECIES:
Species/stock
Bluntnose sixgill shark (Hexanchus griseus)
Basking shark (Cetorhinus maximus)
Thresher shark (Alopias pelagicus)
Thresher shark (Alopias superciliosus)
Thresher shark (Alopias vulpinus)
Thresher shark (Alopias spp.)
Whale shark (Rhincodon typus)
Requiem shark (Carcharhinus falciformis)
Whitetip shark (Carcharhinus longimanus)
Blue shark (Prionace glauca)
Winghead shark (Eusphyra blochii)
Scalloped bonnethead (Sphyrna corona)
Whitefin hammerhead (Sphyrna couardi)
Scalloped hammerhead (Sphyrna lewini)
Scoophead (Sphyrna media)
Great hammerhead (Sphyrna mokarran)
Bonnethead (Sphyrna tiburo)
Smalleye hammerhead (Sphyrna tudes)

8. COMMON NAME AND SCIENTIFIC NAME OF POTAMODROMOUS FISH
Serial
no
Common name scientific name
7 eastern mudminnow Umbra pygmaea)
8 emerald shiner Notropis atherinoides)
9 Fallfish Semotilus corporalis)
10 golden shiner Notemigonus crysoleucas)
11 goldfish Carassius auratus)
12 northern pike Esox lucius)
13 largemouth bass Micropterus salmoides)
14 mud sunfish Acantharchus pomotis)
15 green sunfish Lepomis cyanelluss)
16 eastern mudminnow Umbra pygmaea)
17 emerald shiner Notropis atherinoides)

9. MIGRATORY ROUTE:

YELLOWFIN TUNA :
 migrate all together is
in spawning season. They
will move closer to the
equator for the warmer
water. Each night
Yellowfin Tuna swim 9
miles out to sea to feed
and then returns to
shore by the next day.
This is repeated every
night.

10. 
LAMPREY:
 are "diadromous".
 In the spring, sexually mature adult sea lamprey migrate up
tributaries to spawn.

11. SALMON
  Most Atlantic salmon follow an anadromous fish migration
pattern, in that they undergo their greatest feeding and growth
in salt water; however, adults return to spawn in native
freshwater streams where the eggs hatch and juveniles grow
through several distinct stages.
 Atlantic salmon do not require salt water. Numerous
examples of fully freshwater (i.e., "landlocked") populations of
the species exist throughout the Northern Hemisphere.In North
America, the landlocked strains are frequently known as
ouananiche.

12. 
TROUT
 The brown trout is a non-native, introduced anadromous
species, of which some sea-run strains are found in a few
locations on Long Island in the Bight study area. The anadromous
form of brook trout, a closely related species, is not found in the
study area, but is found in some of the adjacent New England
waters.

13. MIGRATORY ROUTE OF ILISH

 Each year a large number of fish are caught in the
Padma-Meghna-Jamuna delta, which flows into the
Bay of Bengal. It is a sea fish but it lay eggs in large
rivers
 migrates up to 1,200 km inland through rivers in the
Indian sub-continent for spawning. Distances of 50–100 km
are usually normal in the Bangladesh rivers.
 Ilish is also found in the deltaic region of southern Pakistan, in
the province of Sindh. Here it is commonly referred to as the Palla
fish.

15. POSSIBLE SPAWNING GROUND OF HILSA IN BANGLADESH
1. Dhalerchar of Charfasion in Bhola ( area at about 80 square km)
2. Monpura

16. Migratory route of eel :

 The American eel is a catadromous species that lives its
adult life within inland waters along the Atlantic and Gulf
coasts of North America, the St. Lawrence Seaway, and
the Great Lakes; and spawns in the open ocean waters of
the Sargasso Sea in the northwest Atlantic.

17. FISHING GROUND:

 There are four fishing grounds in Bangladesh. These are:
 Elephant Point,
 Kohinur Point ,
 South of South Patch in Cox's Bazar and
 Sowatch of no Ground near the Sundarbans

18. IMPACT ON FISHING GROUND:

 - Loss of flooded habitat during the monsoon, resulting in a loss
of fish production. - Blockage of the movements of fish (adults,
juveniles and hatchlings) between external rivers and
floodplains.
 - Reduced diversity of fish due to the prevention of migratory
species entering the floodplains.
 - Increased fishing pressure on smaller areas of water during
the monsoon, resulting in damage to the long-term
sustainability of the fisheries.
 - Reduced dry season habitat resulting in higher fishing
pressure and increased catchability of overwintering fish
broodstock. The increasing use of water from beels to irrigate
surrounding rice fields is of particular concern.
 - Reduced groundwater recharge, resulting in a lower water
table in the dry season which, in turn, could lead to a reduction
in the area of perennial beels..

19. Recommended mitigation
measures

 - Production of deepwater aman.
- Habitat rehabilitation and protection.
- Increased fish migration across flood control structures.
- Fisheries conservation: Beel management.
- Fisheries conservation: Prohibited fishing zones at regulators.
- Fisheries conservation: Protection of river (duar) fisheries.
- Fisheries conservation: Etablishment of fish sanctuaries
- Conversion of full flood control to partial control.
- Provision of flood pathways in extensive areas protected by
submersible embankments.
- Increased fish migration across rural roads.
- Strengthening of technical assessment and planning
capabilities of BWDB/WARPO.
- Establishment of national database on FCD/I projects.

20. CONCLUSION:

 Finally, not only do they choose the numerical
assumptions of their quantitative models, they also choose
whether to use quantitative models at all.

21. 
THANKS TO ALL