Which of the following is a freshwater fish?

Which of the following is a $Mackerel$?

Which of the following is an exotic Indian fish?

Blue revolution is enhancement in production of

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.

People living in coastal areas mainly depend on which of the following for food?