Question

If a sweet water fish enters a sea, the fish will

• A. swell
• B. be squeezed
• C. remain as it is
• D. suffer none of these

Answer 1

The correct option is B be squeezed

Liquid pressure is given by =$\rho \times g\times h$

The water from river has a lower density than the sea water. So, at equal depth, sweet water or river water exerts less pressure than sea water. Body of a sweet water fish is habituated with this lower pressure of river water. Naturally, when the fish will enter the sea, it will suffer greater pressure due to increase in density and hence the body of the fish will be squeezed slightly.