Integrated silkworm waste and fish culture
1991
Pradit Sripatrprasite
Two experiments were conducted to study the use of the waste from silkworm (Bombyx mori) production in fish culture. The first experiment determined nutrient release characteristics of silkworm waste in water. Silkworm waste obtained from two types of silkworm production systems in Northeast Thailand contained 2.29 % total Kjeldahl nitrogen and 0.20 % total phosphorus. The cumulative total nitrogen released from silkworm waste in water was 7.2 mg/g DM (31.6 % released) and total phosphorus was 0.71 mg/g DM (35.6 %) over a period of 9 days. The second experiment replaced inorganic fertilizers with silkworm wastes in the culture of Nile tilapia (Oreochromis niloticus) in static water tanks. After an 8 week culture period, the best fish yield (2.1 g/square m/day) was attained by replacing 25 % of the total nutrients with silkworm waste (equivalent to 54.4 kg DM/ha/day). Treatments using inorganics alone or egg-layer chicken manure performed more poorly (1.34 and 0.7 g/square m/day respectively) despite having slightly higher nutrient loadings (3 kg N and 0.6 kg P/ha/day compared to 2.7 kg N/ha/day in the silkworm waste treatment). Treatments with higher loadings of silkworm waste were characterized by poor dissolved oxygen regimes and very poor fish survival.
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