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With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:

1. Biofilters provide waste treatment by removing uneaten fish feed.
2. Biofilters convert ammonia present in fish waste to nitrate.
3. Biofilters increase phosphorus as nutrient for fish in water.

How many of the statements given above are correct?
(a) Only one
(b) Only two
(c) All three
(d) None



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Statement 1 is correct. Biofilters in a Recirculating Aquaculture System (RAS) provide waste treatment by removing uneaten fish feed and other organic matter, helping to maintain water quality.

Statement 2 is correct. One of the primary functions of biofilters in RAS is to convert toxic ammonia, which is excreted by fish waste, into nitrate through the nitrification process. This conversion is performed by specific nitrifying bacteria present in the biofilter.

Statement 3 is not correct. Biofilters in RAS do not increase phosphorus as a nutrient for fish in water. In fact, the goal of RAS is to maintain proper nutrient balance and prevent nutrient buildup, including phosphorus, to ensure optimal water quality for fish.


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