Q85.
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?
Answer
B
Explanation
aquaculture systems (RAS) are unique ecosystems that minimize environmental by reducing nutrient pollution discharge. are indoor, tank-based systems in which fish are at high density under controlled environmental biofilter system purify the water and remove or harmful waste products and uneaten feed. use microorganisms, which are capable of many compounds, fixed to an medium to break down pollutants Hence statement 1 is correct. is removed from an aquarium system through use of a biofilter. The biofilter provides a substrate which nitrifying bacteria grow. These nitrifying consume ammonia and produce nitrite, which also toxic to fish. Other nitrifying bacteria in the consume nitrite and produce nitrate. Hence 2 is correct. are also used to remove phosphorus waste generated by fish. Thus biofilters do not phosphorous content in aquatic systems. statement 3 is not correct.