What is the length of the coastline of Gujarat (in $, km$)?

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.

The organization of fish and fishermen in a specific area is known as ...

Which of the following is a $Mackerel$?

Which of the following is a freshwater fish?

Which of the following is a migratory fish?