Which of the following industries is a significant sector in India for food production?

Which of the following are freshwater fishes that have great food value?

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.

Aquaculture includes which of the following?

$S$ - Statement: The world is covered by $2/3$ water.
$R$ - Reason: Approximately $90\%$ of the world's fish production comes from the sea.

Which of the following is not a freshwater fish?