Your question: Which of the following are marine but migrate for spawning to freshwater?

Anadromous fishes spend most of their adult lives at sea, but return to fresh water to spawn. Catadromous is a term used for a special category of marine fishes who spend most of their adult lives in fresh water, but must return to the sea to spawn.

Which migrate to freshwater for spawning?

Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.

Are marine but migrate for spawning to fresh water?

Cyclostomes are marine vertebrates but they show migration to fresh water for the process of spawning. Spawning means the condition to lay the eggs to give rise to new individuals. After spawning, these fishes die within a few days. Their larvae that remain return back to the ocean after metamorphosis.

What is Oceanodromous?

Oceanodromous fish, which occur widely throughout the world’s oceans, live and migrate wholly in the sea. They differ mainly from one another by the method and extent of their migration.

What is Diadromous?

Diadromous is a general category describing fish that spend portions of their life cycles partially in fresh water and partially in salt water. These represent both anadromous and catadromous fish. Anadromous fishes spend most of their adult lives at sea, but return to fresh water to spawn.

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Is Hilsa a migratory fish?

Hilsa (Tenualosa ilisha)is an anadromous migratory fish. It migrates from the Bay of Bengal to the freshwater Brahmaputra for spawning. Hilsa is known to ascend several kilometers from the sea. The range of migration in the Hilsa migrate about 540 Km.

Which factor is responsible for fish migration?

(a) Anadromous migration: When fresh water fish exhibit migration from spawning areas (fresh water) to feeding areas (ocean). e.g. Brown trout, Petromyzon, Gasterosteus etc. Physical factor: Bottom materials, depth of water, temperature, turbidity, photoperiodism etc.

Which part of a fish’s body does not help it to hear?

Only the tail region of the fish don’t possess the hearing capacity.

What is Catadromous life cycle?

Starting life at sea but then migrating into freshwater is known as a catadromous life history. Freshwater eels migrate thousands of kilometres into the Pacific Ocean to release eggs and sperm in a process called spawning. During this migration, eels do not feed.

What is the biggest threat to anadromous fish?

The top threats to anadromous species are overwhelmingly estuary alteration, major dams, and agriculture, while inland species face threats from alien species, fire, and hatcheries.

Population movement