Ảnh hưởng của các loại nền đáy khác nhau đến tăng trưởng và sinh khối của Trùn chỉ (Limnodrilus hoffmeisteri Claparede, 1862)

Abstract

The study aimed to determine the optimal substrate for L. hoffmeisteri culture in artificial conditions. The experimental period consisted of 4 treatments (T) randomly designed and replicated 4 times. It included T1 (control): 100% sludge; T2: 50% sludge + 50% chicken manure; T3: 50% sludge + 50% cow dung; and T4: 50% sludge + 25% cow dung + 25% chicken manure. The obtained results showed that L. hoffmeisteri biomass gained between 45.4 - 367g/m²; the highest biomass was found in T2 of 367 ± 39.9 g/m², while the lowest was recorded in T1. The population density ranged between 53,900 – 87,125/m²; the highest density was found in the T4 of 87,125 ± 14,766/m² and the lowest one in T2. Thus, it shows that 50% sludge + 50% chicken manure is the optimal substrate for raising bloodworms.