Neco Model Questions Vol1 2025 Agricultural Science Question 36

An earthen fish pond covering (2\) ha is stocked with catfish fingerlings at a density of (10{,}000\) fingerlings per ha. During the first (3\) months, (80\%\) of the fingerlings survive; thereafter, the survival rate for the remaining period is (70\%\) of the survivors. The average weight of a fish after the first (3\) months is (0.2\) kg and each fish gains (0.15\) kg each subsequent month. The farmer plans to harvest the fish after a total of (9\) months. The market price of catfish is \(\text{₦}500\) per kg for fish harvested in the first (6\) months and \(\text{₦}650\) per kg for fish harvested in the last (3\) months. Feed cost is \(\text{₦}120\) per kg of weight gain. Fixed costs amount to \(\text{₦}50{,}000\). Assuming the farmer sells half of the surviving fish at month 6 and the remainder at month 9, calculate the net profit (in Naira) from this culture.