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Q.
Which of the following fish is famous for migration?
NTA AbhyasNTA Abhyas 2020
Solution:
Salmon is a bony fish belonging to the subclass Actinopterygii (ray finned fishes), which is one of the two subclasses of the class Osteichthyes. Adult fishes of this class have a bony endoskeleton, hence they are named bony fishes.
Some peculiar features of Salmon include-
They have 4 pairs of gills that are covered by an operculum on each side that helps them breathe without having to swim.
The presence of air bladder is also an advantage, as it regulates buoyancy.
The heart is 2 chambered (one auricle and ventricle each).
They are cold-blooded or poikilothermic.
Ammonia is the primary nitrogenous waste.
Sexes are separate.
Fertilization is generally external and development is direct.
Salmons are particularly famous for migration. Migration is the movent of an organism from one place to another place for feeding, breeding and to escape adverse condition. Salmons migrate to other places for breeding by using the earth’s magnetic field and inclination of earth. Most of the species of salmon are anadromous i.e., live in both fresh and marine waters. This nature of salmon is attributed to the fact that, they hatch in fresh water, then migrate to oceanic waters and again come back to fresh water to reproduce.