Question

Name the fish out of the following, which if taken out of water will die immediately.
A. Hilsa
B. Trout
C. Salmon
D. All of the above

Answer 1

Hint:-Fishes are the aquatic vertebrates The earliest known vertebrates to appear in fossil record were jawless
primitive fish like animals collectively known as the Ostracoderms and placed under the class Ostracoderm.

Complete answer:
Fishes generally remain submerged under water. They require gills and other accessory organs for breathing and respiration. Fishes die when they are taken out of water because their gills stop functioning. Fish taken out of water die of suffocation due to lack of oxygen. This is because the gill filaments stick together when taken out of water, thereby reducing the surface area.
Now let us gather information about given options:
Hilsa: these fishes belong to herrings. These fishes immediately die in 2-3 second as taken out of water as these fishes do not have air sacs. They are very much sensitive to light and temperature condition so they can not adapt themselves at outside temperature
Trout :- it is a freshwater fish. It dies after sometime when taken out of water. It usually takes 2-3 minutes because their gills stop functioning and they can not breathe oxygen in the terrestrial environment.
Salmon :- it is a salt water fish. These fishes can live up to 4 hours when taken out of water. They can thrive in the outside environment. They only needs to remain wet to breathe and live but after few hours they die
All of the above :- as only one option is correct this option can not be correct.

Our required option is Hilsa.

Note:- Hilsa is the only Indian fish that migrates from the seas to the river for breeding. so they require water for their every activity whether digestion, respiration and breeding. Thus it is the cause that they immediately die when taken out of water.