虾池基础饵料及对虾养成期敌害生物的初步调查

Preliminary investigation of basic diets in prawn culture pond and predator fishes in defferent prawn growth periods

作者于1983～1984年在普陀朱家尖和定海北蝉大成对虾养殖场调查时,发现虾池内基础饵料生物优势种有4种,主要敌害生物(鱼类)为23种。试验证明,用鱼藤精(1×10^(-6))杀灭敌害生物效果很好,而对对虾无不良影响。

(1) The basic food organisms in prawn culture pond are mainly composed of such species as Neomysis awatschemsis. Sinocalanus laevidactylas, Schmackeria dubia, Corophium spp.. They show effective results to culture plankton by artificial nourishment. (2) In the stage of prawn culture, twenty-three predator fishes were found. They are chiefly composed of such species as Portunus trituberculatus, Nibea albiflora, Eleutheronema tetradactylum, Lateolabrax japonicus, Triclentiger trigonocephalus. Eggs and larvals always appear in May and June. Predator fishes raised and grow in July and August. After the middle of September predator fishes decrease obviously. (3) The experiment to treat predator fishes with 1 ppm in pond was carried out and has got a satisfactory result. All fishes had been killed, but no prawn loas killed under this treatment.