نوع مقاله : مقاله پژوهشی
نویسنده
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
A research experiment carried out to pike-perch culture for enhancement program in south-west Caspian Sea. Brood-stock achieve spawning time during March-April when the ambient temperature in local climate ranges 12 – 14 ֯C. Man-made nests prepared by wooden frames and which synthetic wool bunches are fastened and placed in pond water at intervals of 5 meters each. The spawners preferred the green texture nest material which were placed close to bottom. The eggs drop on the nest and average fertilization occurred 30 - 90%. The nests, eggs on them are kept in mist chamber and also collected fertilized eggs placed into 200 lit zugjar for development. The former method and technique produced better survival rate. Appearance of eye pigmentation on the eggs observed during the 3th or 4th day of incubation process. Yolk-sac absorption lasted 9-13 days. The water temperature recorded 12-16 ֯C during the culture. The numbers of 1g dry eggs computed 1900-2050 and swelled eggs 1120-1170. Avera.....
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