What is estuaries, how they are suitable for both marine and river fish to live?

● Estuaries are the place where seawater and fresh water mix together.

● It is resource of brackish water.

● Both local and imported fish species are used in such systems.

● In such a system, a combination of five or six fish species are used in a single fishpond.

● The species are selected I such as way that they do not compete for food and space among themselves.

● They have different types of food habits so that the all the food available in the different parts of the pond is used.

● For example, Catlas are surface feeders. Rohus feed in the middle zone of the pond. Mrigals and common carps are bottom feeders.