Neco 2019 Agricultural Science Question 48

A fish pond has a surface area of 2 ha and an average depth of 1.5 m. The farmer intends to stock the pond at a density of 5,000 fingerlings per hectare. Each fingerling weighs 20 g at stocking and is expected to reach 500 g after 6 months. The feed conversion ratio (FCR) is 1.8 kg feed per kg fish gain. The feed contains 35\% protein with a digestibility of 90\%, and fish require 2.8 g digestible protein for every 100 g of weight gain. Each gram of feed results in 0.12 g of nitrogen excreted, and the water can sustain a maximum nitrogen load of 150 kg per month. Determine (i) the total amount of feed required for the whole pond over the 6‑month period, and (ii) whether the average monthly nitrogen excretion exceeds the permissible limit.