lauttimur.com - Many species of fishes are doing migration on the basis of their needs from daily to annually. Fish migrating usually in matter of searching food or reproduce. Migration means the move of the fish from one place to another place on a large group and certain duration than those arising during normal activities. Some example of fish migrations is anadromous and catadromous. These are some comparison between those two.

Similarity between Anadromous and Catadromous Fish

•    Both anadromous and catadromous fish are type of fish that experiencing different life stage at different habitats.
•    It is a migration that has purpose on a reproduction or to find new feeding ground.
•    Both anadromous and catadromous fish are euryhaline, which can adapt to a wide range of salinity.

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Anadromous

Anadromous fish is a fish that spend most of their live in the saltwater or sea and will return to the freshwater to spawn. after the eggs are hatch, the juvenile will stay in freshwater for a while and at some points their young would go back to the sea to undergo maturation. The adults fish will eventually back to freshwater when it is time to spawn. Some species of fish would travel more than hundreds of kilometres between their breeding ground and their marine habitat. Other species just migrate a few distance to spawn in to the brackish water. The term ‘anadromous’ generally means upward-running. 

Some species of fish that categorized as anadromous fish are striped bass, salmon, steelhead trout, sturgeon, smelt, shad and herring.

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Catadromous 

Catadromous fish is a fish that live most of their lives in the freshwater and will return to the saltwater to spawn. Catadromous fish eggs will hatch and experiencing juvenile period in the seawater. Their young will migrate to freshwater in order to undergo the maturation. Catadromous fish will spend most of their life in freshwater. The term ‘catadromous’ is generally means downward-running.

The main type of catadromous fish is true eels, which their females will spend most of their life in freshwater. The males usually tend to live in the brackish water.