Hilsa Fish Saad

Scientists associated with the study told the BBC that this is the reason.

They live in the Bay of Bengal along the mouth of the Meghna River in the Bay of Bengal. During the south-west monsoon air flow (January to February) these breeding periods. For leaving the eggs, they enter the Meghna River and leave the eggs and move towards the uprun and spread to the northern rivers of Bangladesh. In particular, the Meghna crosses the Padma and the end of the Jamuna river. The egg diameter of this fish ranges from 0.7 to 0.9 mm. They are found in the water under the depths of the river and in the water and there it is bamboo. A full-grown female-Hilsa contains about two million eggs. Egg-free pona and unmarried adult fish get increased in the river. When the fona length of this fish is 6-10 centimeters long, then it is called Jatka. Then they went back to the sea when they were a bit bigger.