Question

the fish that is a sea water fish but it returns to its fresh water home to lay eggs​

Answer 1

Answer:

Petromyzon (Lamprey) belongs to the Class- Cyclostomata of Phylum-Chordata. It is a jawless fish which lays eggs in fresh water. The eggs hatch in about 3 weeks into minute transparent larvae called ammocoetes...

Answer 2

Answer: The fish that is a sea water fish but returns to its fresh water home to lay eggs is called anadromous fish.

Explanation:

These are fish that are born in fresh water, migrate to saltwater to mature, and then return to freshwater to breed and lay their eggs. This unique behavior is observed in several species of fish, including salmon, shad, and eels.

Anadromous fish are able to make the transition from freshwater to saltwater and back again through a variety of physiological and behavioral adaptations. For example, they have specialized organs that allow them to regulate the salt content in their bodies, and they are able to navigate complex river systems using their sense of smell.

The migration of anadromous fish to their freshwater homes is an essential part of their life cycle, and it plays a critical role in maintaining the health of freshwater ecosystems. The nutrients that these fish bring with them from the ocean help to fertilize the rivers and streams, which in turn supports the growth of a variety of aquatic plants and animals.

Despite the challenges that anadromous fish face during their migration, including predation and changes in water temperature and quality, they are able to complete their journey successfully year after year. This remarkable behavior is just one example of the incredible diversity and adaptability of the natural world.

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