[Solved] With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements. Biofilters provide waste treatmernt by removing uneaten fish feed. Biofilters conver ammonia present in fish waste to nitrate Biofilters increase phosphorus as nutrient for fish in water.

Q45. With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements.

1. Biofilters provide waste treatmernt by removing uneaten fish feed.
2. Biofilters conver 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?

1. Only one
2. Only two
3. All three
4. None

Answer: 2

Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity

All RAS relies on biofiltration to convert ammonia (NH4+ and NH3) excreted by the fish and organic matter (including uneaten feed) into nitrate.

Ammonia is a waste product of fish metabolism and high concentrations (>.02 mg/L) are toxic to most finfish.

Biofilters do not increase phosphorus levels.

Phosphorus is usually managed through feed composition or water exchange.