Question
In: Biology
1. The krill Euphausia pacifica, feeding on the diatoms, increased in dry weight by an average...
1. The krill Euphausia pacifica, feeding on the diatoms, increased in dry weight by an average of 1.6 mg per month, while consuming an average of 5.0 mg dry weight of prey. This krill assimilates its prey with 80% efficiency. Calculate the gross growth efficiency and the net growth efficiency for this krill.
2. In general, growth efficiency for marine fish is much higher than that in terrestrial mammals. Explain reasons for that.
Solutions
Expert Solution
Answer:
Based on the given information:
- Increased in dry weight by an average of 1.6 mg / month, therefore Growth G = 1.6 mg / month
- Diatoms consumed = 5.0 mg
- Assimiliation efficiency = 80%
- Ingestion rate (R) = 5 mg /month
- Gross growth efficiency is the ratio of growth to ingestion =
Growth / total food ingested
- Gross growth efficiency = 100%*(G/R) = 100*(1.6 / 5) = 32%
- Net growth efficiency can be determined from growth and
assimilation efficiency
- Net growth efficiency = 100%*(Growth / Assimilated ratio)
- Net growth efficiency = 100%*(G/AR) = 100%*(1.6/(0.8*5)) = 40%
Growth efficiency for marine fish is much higher than that in terrestrial mammals:
- For zooplankton and fish the growth efficiency is usually between 30-80% which is much higher than in terrestrial mammals which is around 2-5%. The reason for this is the low metabolic requirements of marine fish as compared to terrestrial mammals. Fish are also more efficient feed converters as compared to terrestrial mammals.
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