Nursery concept is good for grow out farming. Generally it is advised that hatchery and nursery should be at two places however the distance between the two can be location specific.

Dear Amit Ranjan,

It does not matter how far the nursery is. It matters you do not put any kind of stress to the fry/fingerlings including light stress. Obviously the more distance to transport the more stress on the fry.

Temperature, D. O. , pH, salinity (for marine fish or shrimp) should be more or less same. nursery could be to the next door of the rearing tank in the hatchery.

The main concept of nursery is giving more space with slow exposure to light and more specifically environmental adaptation of the baby species. This system increases the survival rate of fry in the grow out farm.

Please let me know if you want to know more.

I hope this info helps.

Mohammed Khandaker

Dear Mohammed,

Thanks for your answer. Distance between hatchery and nursery has advantages e.g. discharge water and wastewater and phytoplankton after treatment and release to sea, will not come back to the system. But have some disadvantages e.g. management in high distance is difficult, as you mentioned stress is more and etc. Now question is that if we have both hatchery and nursery in the same site, how to treat and release wastewater to sea that dose not threaten the system health and provide good biosecurity?

Dear Hamed,

Apology for the gap in answering the question as I am in a Scientific training in Switzerland ( Zurich University of Applied Sciences, ZHAW).

Treating waste water varies according to the national policy of that country. It is necessary to check with the Department of Environment and/or Fisheries department of the country. Most of the countries have strict regulations regarding releasing aquaculture effluent in the river or sea.

As a responsible citizen of a country, we would not do any activity that deteriorates the environment.

Thanks.