Dear Experts,
Can anyone elaborate and explain what is a Closed RAS with BFT for Shrimp farming. What are the steps involved in this method.
Thanks and Best regards
Where am I?
In ShrimpList you can ask and answer questions and share your experience with others!
Hi Dr, Kada,
I apologise for answering your question since I don't consider myself as one of the experts in the shrimp aquaculture industry of this planet... but in my humble opinion the best indoor shrimp farming is done using BFT with some RAS amenities.
Not the other way around. At least in my personal opinion as a mediocre unqualified person of this industry.
Kind regards,
Nelson
Oligotrophic RAS (clear-water) technique devoid of tank-natural food productivity in indoor shrimp farming works only when you have the best quality shrimp feed that can provide all the nutrient needs of the cultured shrimp for physiological maintenance, growth, and development.
On the other hand, a non-oligotrophic RAS (turbid-water) is just an inefficient RAS system with poor recirculation filtration capability that is inefficacious in holding its own biomass density in conjunction with its feed input requirement.
Kind regards,
Nelson
Dear Nelson,
Can you kindly elaborate what is an Oligotrophic RAS. As you mentioned it to be a Clear water system, does it mean water needs to be transparent and crystal clear. Correct me if I am wrong. If so, how do we achieve clear water in RAS. Does installation of UV and Ozone helps to achieve clear water or good solid filtration with biofilter such as an MBBR is sufficient?
Dear Dr. Kada,
The Clearwater Shrimp Farm in Missouri, a landlocked states in midwestern U.S.A., is an example of a commercial indoor closed-marine clearwater (oligotrophic) shrimp RAS where the culture water is maintained clear all the way from nursery to grow-out continuously within repetitive production cycles.
https://www.youtube.com/watch?v=u63kV7TrmMA
Where the suspended solids and dissolved nutrients are continuously removed through a series of inline sequential compartmentalized life support filtration system (both physical and biological).
Hence, the term Clearwater Shrimp RAS.
Kind regards,
Nelson
In the words of Dr. Andrew J. Ray et al. (2017) and I quote: “By nearly eliminating solids from the water and using an external biofilter, substantially better water quality was maintained in the clearwater system (CW), which may have been a major contributor to the improved shrimp production in that treatment.”
https://www.sciencedirect.com/science/article/abs/pii/S0144860916302084
But once again, in my humble personal opinion, clearwater shrimp RAS only works if you have the best quality shrimp feed that can provide all the nutrient needs of the cultured shrimp for physiological maintenance, growth, and development in a closed recirculating shrimp production system devoid of tank natural food productivity.
Kind regards,
Nelson