Question

Stenohaline fishes are represented by
A. Fresh water fishes only
B. Marine fishes only
C. Those which can tolerate a narrow range of salinity in water only
D. Those which can tolerate a wide range of salinity in water

Answer 1

Hint: In Stenohaline, steno means narrow haline means salt. This will help us find our answer more easily. This means that organisms that can survive in narrow or low salt content waters.

Complete answer:
Stenohaline fishes or any stenohaline organisms describe that they cannot tolerate a wide range of salinity in water whereas euryhaline organisms can tolerate a wide range of salinity in water.

> Option A- Freshwater fishes only: Fresh water fishes are those fishes that spend their life in fresh waters such as rivers, lakes. These fresh water rivers are very different from marine conditions and these have salinity less than 1.05 %. These are not stenohaline fishes.

> Option B- Marine fishes only: These are fishes that live in ocean water or we can say saltwater fishes. These are not stenohaline fishes.

> Option C- Those which can tolerate a narrow range of salinity in water only: Stenohaline fishes are those fishes that tolerate narrow salinity in water hence, this is the correct option.

> Option D-Those which can tolerate a wide range of salinity in water: No stenohaline fishes cannot tolerate a wide range of salinity in water.

Hence, the correct answer is option (C).

Note: Goldfish is a freshwater fish. This fish only survives in freshwater and dies when left in sea water because it cannot tolerate high salinity of seawater. So this is a stenohaline fish.
Haddock fish is a marine fish that cannot survive in freshwater due to low salt content of water. This is a euryhaline fish.