Biofilters in recirculating aquaculture — waste treatment, ammonia to nitrate, phosphorus increase
Question
With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements: How many of the statements given above are correct?
- 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.
Options
Only one
Only two
All three
None
Explanation
Only Statement 2 is correct. The primary function of a biofilter is biological: nitrifying bacteria cultivate inside it to convert highly toxic ammonia (from fish waste) into less toxic nitrate. Statement 1 is incorrect; mechanical filters (not biofilters) remove solid waste like uneaten feed. Statement 3 is incorrect; biofilters do not generate or increase phosphorus nutrients.
Answer: (a).
Question details
Year
2023
Paper
GS Paper 1
Question
Q55
Subject
Science & Technology
Sub-topic
Biotechnology & Genetics
Type
How-many counting
Difficulty
Medium
Nature
Static
Source hint
NCERT Biology Cl.12 / Recirculating Aquaculture Nitrification
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