It also exempted hatcheries, feed plants, commercial aquaria, movement of fish/ shrimp and fish products, fish seed/feed and workers for all these activities.
It said social distancing and hygiene should be observed during the work related to the sectors granted the exemption.
The Home Ministry has issued the fifth addendum to the consolidated guidelines regarding the nationwide lockdown to fight COVID-19.
The 21-day lockdown came into effect from March 25.
( With inputs from ANI )