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Migration In Fish

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Migration is a periodic movement of a fish species from one place to another for the purpose of breeding. On the other it may be due to threat in aquatic medium because of escape from strong predator and also to escape from a particular nature of polluted environment. Therefore, migration in fish is related to many parameters, of course fish breeding is one of the important parameters. Heape (1931) has defined migration as “a class of movement which impels migrants to return to the region from which they have migrated”. Generally migration is from feeding ground to breeding ground and vice-versa. Migration may be seasonal or annual. Migration in fishes is not common. …show more content…

Salmo salar (Atlantic salmon), Acipencer (sturgeon) and Hilsa b) Catadromous – These fishes spent major part infresh water but migrate tosea sea for spawing. e.g. Anguilla anguilla (eel fish) c)Amphidromous – These fishes migrate from fresh water to sea and vice versa., but it is not for the purpose of breeding. e.g. Gobies d)Potamodromous – Migratory fishes are confined to fresh water e.g. Carps and trouts. d) Oceanodromous – Migration is confined to sea only e.g. Clupea (herring), Thunnus (tuna) and Scomber …show more content…

*Migratory behavior of eel was described for the first time by Schmidt (1922). *Eels take a long journey of about 4500-6000 km to find their breeding grounds. *European eel lay their eggs in Sargasso sea near Bermuda islands during spring. *These eggs hatch into leaf shaped larvae called “leptocephalia”. *These larvae of about 6 mm in length start homeward journey. *During the movement, larvae maintain a depth of 150 ft. *In one year, these larvae are 25 mm in size and starts swimming on the surface. *In the second year, these larvae attain size of about 50-55 mm. *In the third year, they are of about 75

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