Which of the following is a freshwater edible fish?

Consumption of fish is considered to be healthy when compared to the flesh of other animals because fish contains:

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.

Why are modern techniques implemented in fisheries?

Approximately ... of the world's fish production comes from the sea. (in $\%$)

Induced breeding is effective in which of the following?