عنوان مقاله [English]
To obtain the normative s of artificial breeding biotechnique of Aspius aspius, mass production through artificial breeding and also recruitment of this valuable species, a project called “Artificial propagation of Aspius aspius” was planned and implemented. The project results indicate that: The reproduction season of this species is winter and its exact duration is from mid February to late march, in the climatic condition of Guilan province. The suitable spawning temperature range is 10-13 ˚C and egg incubation duration is 9-10 days- The effective dosage of pituitary gland to induce spawning is 3-4 mg per kg of fish weight. Hormone injection and egg stripping were carried out at time intervals of 25.5-30.5 hours. During the two years of project implementation (two spawning seasons, from February-march) 15 tests were carried out and 3.9 female breeders were injected. The number of normal eggs was 386-536 per gram and the swollen eggs were counted to be 117-277 per gram. The normal eg.....