Which of the following is a $Mackerel$?

What is aquaculture? Give an example of an animal that can be multiplied by aquaculture.

Blue revolution is enhancement in production of

Explain the concept of the Blue Revolution.

Which of the following are common edible freshwater fishes?

Identify the correct statements from the following:
$(i)$ Modern techniques are implemented to increase the production of plants and animals in marine habitats.
$(ii)$ $Catla$,$Rohu$,$Mrigal$,and $Hilsa$ are major carp fishes.
$(iii)$ $Hilsa$,$Sardines$,$Rohu$,and $Mrigal$ are marine food fishes.
$(iv)$ Fisheries can be either marine or freshwater.