To the problem of production of viable juveniles of haarder from spawners from natural populations
YugNIRO scientists carried out research on production of larvae and fingerlings of the haarder Mugil soiyu in the Kerch Strait from May to July 1993. Comparison of the physiological state data for spawners from wild populations with those for breeding stocks from ponds in the northwestern Black Sea region shows high heterogeneity of the latter as to the degree of their maturity. Wild spawners were in better shape for reproduction, they had larger eggs, although variation in size composition of ovocytes was fairly high. The hypophysis from carp Cyprinus carpio was used for hormonal stimulation of haarder females. An effective dose of hypophysis to secure full ovulation was, on an average, 10-12 mg/kg body mass, with 2 to 3 days to riper. Haarder from wild population in the Kerch Straits were more sensitive to hormonal preparations than fish from pond-reared breeding stock. Of 28 females treated, 21 individuals had full ovulation. A total of 21 batches of haarder eggs were incubated. The eggs were stocked in culture tanks at a density of 70-110 eggs/l. At early fission stages, the survival rate considerably varied, ranging from 10 to 90% in different batches. A total of 800,000 larvae were produced from incubation, which accounted for 11.8% of the egg input.
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1994
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| Subjects: | Mugil so-iuy, Fingerlings, Larvae, Natural populations, Breeders, Aquaculture development, Hormones, Survival rate, Incubation, Ovulation, Овуляция, Сеголетки, Пиленгас, Природные популяции, Развитие аквакультуры, Производители, Гормоны, Спермиация, |
| Online Access: | http://hdl.handle.net/1834/15810 |
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| Summary: | YugNIRO scientists carried out research on production of larvae and fingerlings of the haarder Mugil soiyu in the Kerch Strait from May to July 1993. Comparison of the physiological state data for spawners from wild populations with those for breeding stocks from ponds in the northwestern Black Sea region shows high heterogeneity of the latter as to the degree of their maturity. Wild spawners were in better shape for reproduction, they had larger eggs, although variation in size composition of ovocytes was fairly high. The hypophysis from carp Cyprinus carpio was used for hormonal stimulation of haarder females. An effective dose of hypophysis to secure full ovulation was, on an average, 10-12 mg/kg body mass, with 2 to 3 days to riper. Haarder from wild population in the Kerch Straits were more sensitive to hormonal preparations than fish from pond-reared breeding stock. Of 28 females treated, 21 individuals had full ovulation. A total of 21 batches of haarder eggs were incubated. The eggs were stocked in culture tanks at a density of 70-110 eggs/l. At early fission stages, the survival rate considerably varied, ranging from 10 to 90% in different batches. A total of 800,000 larvae were produced from incubation, which accounted for 11.8% of the egg input. |
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