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Diadromous Migration
Potamodromous migration.
- Binamra Adhikari
- Bikram Rayamajhi
- Bibush Bajracharya
- Ishan Magar
Migration between river and sea water and vice versa.
Types of diadromous migration.
- Within long distant freshwater for spawning.
- After laying eggs they return to their original place for feeding.
For eg; carp and trout fishes.
- Anadromous: Migration from sea to the river water for breeding. For eg; salmon, hilsa, etc.
- Catadromous: Migration from river to sea for breeding. For eg; anguilla.
- Amphidromous: Migration between river and sea water and vice versa but not for breeding, may be for feeding ,survival. For eg: Gobies fish.
Classification of migratory fishes.
Ocenodromous Migration.
Within sea water for spawning and later return to thier feeding sites
- Alimental or feeding migration; Migration in response to feeding.
- .Gametic or spawning migration; Migration in response to spawning.
- Climatic or wintering migration; Migration in response to climate.
- Diadromous: Between river and sea water and vice versa.
- Potamodromous: Within long distant freshwater for spawning.
- Ocenodromous: Within sea water for spawning and later return to thier feeding sites
Table of contents.
Cause of fish migration.
What is fish migration??
physical factor -1. temperature,2 light intensity, 3 turbidity, 4 depth of water,5 current of water chemical factor- PH of water, 2 salinity, 3 smell of water biological factor- 1, sortage of food,2, pressure of pridotars comprititars,3 physiological clock,5 hormonal change,6 food memory, 7 blood pressure etc.
- Introduction
- Classification of migratory fishes
- Causes of migration
- Advantages of fish migration
- Disadvantages of migration
- Disadvantages of fish migration
The movement of fishes from one place to another to feed, reproduce and escape from predators.
Advantages of fish migration.
1)Find better climate
2)Better availability of food
3)Less competition
4)Better adaptability in new place
5)Promote geographical dispersion
Disadvantages of fish migration.
Fish Migration
1)Chance of loss of life due to predators.
2)They may die due to natural disasters like tsunami,cyclone,etc.
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