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Pavlov E.D.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Tun N.V.,Research Institute Of Aquaculture No 3 Ria 3 | Tu N.T.H.,Research Institute Of Aquaculture No 3 Ria 3
Journal of Ichthyology | Year: 2010

Gonad morphology and structure of sex cells in juvenile triploid trout Oncorhynchus mykiss of the Donaldson breed incubated and reared at a trout plant under climatic conditions of South Vietnam have been studied. Anomalies in the structure of sex gonads and oocyte structure were found, and partial resorption of sex cells was detected. It was shown that sex inversion in triploid (unisexual) fingerlings of rainbow trout passed successfully on the whole since many sex gonads of these fish simultaneously had both female and male sex cells and sometimes were sterile. The connection of anomalies found in the structure of sex system of trout with species rearing under unusual for it climatic conditions and artificial sex inversion is discussed. © 2010 Pleiades Publishing, Ltd. Source


Orlov A.M.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Kulish E.F.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Mukhametov I.N.,Sakhalin Research Institute of Fisheries and Oceanography SakhNIRO | Shubin O.A.,Sakhalin Research Institute of Fisheries and Oceanography SakhNIRO
Journal of Ichthyology | Year: 2011

On the basis of materials collected from catches of drift salmon nets in Pacific waters off the Kuril Islands from 2005 to 2006, the age and rate of growth of Spiny Dogfish Squalus acanthias are considered. Individuals with a length of 67-123 cm and weight of 1140-5970 g aged 10-26 years were represented in catches. In almost all age classes, the length of males was greater and the weight smaller than in females. The lifespan of females is slightly higher as compared to males-26 and 25 years, respectively. The values of K coefficient of the Bertallanffi equation of growth in males and females comprised 0.10 and 0.05 and the calculated values of the asymptotic body length comprised 116.3 cm and 147.2 cm. A relationship was found between the age of spiny dogfish and the spine size: its length (rs = 0.693), base width (rs = 0. 815), and base length (rs = 0.823). © 2011 Pleiades Publishing, Ltd. Source


Orlov A.M.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Abramov A.A.,Russian Federal Research Institute of Fishery and Oceanography VNIRO
Journal of Ichthyology | Year: 2010

New data on fecundity, sex ratio in different size groups, and the rate of sexual maturation of shortspine thornyhead Sebastolobus alascanus in the northwestern part of the Pacific Ocean are provided. Individual absolute fecundity of the studied females varies in the range of 175 000-821000 (on average, 392500) eggs. In Pacific waters off the Kuril Islands and Kamchatka, among individuals with a length to 41 cm, males dominate; in size groups of 42-59 cm, sex ratio is almost equal; among larger fish, females prevail. In the western part of the Bering Sea among analyzed fish with a length to 44 cm, sex ratio is almost equal; among larger individuals, females dominate. Half of males and females of shortspine thornyhead off the eastern coast of the northern Kuril Islands and southeastern Kamchatka mature at a length of approximately 41 cm that can be recommended as a commercial size for the given species in this area. © 2010 Pleiades Publishing, Ltd. Source


Esin E.V.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Sorokin Y.V.,Russian Federal Research Institute of Fishery and Oceanography VNIRO | Leman V.N.,Russian Federal Research Institute of Fishery and Oceanography VNIRO
Journal of Ichthyology | Year: 2011

Comparative characteristics are presented of hydrological conditions, toxicological situation (chemical composition by 35 elements and water biotesting), macrozoobenthos, and Fish population in a salmon river at the impact zone of volcanic activity and in a pure tributary flowing in similar natural conditions. It is shown that extremal life conditions for hydrobionts are formed under the influence of volcanic activity: excess of maximum admissible concentration of injurious substances for water bodies of fish cultural importance by five elements, turbidity up to 371.5 mg/l, and pH up to 5.3. Mean abundance of macrozoobenthos and spawning density of salmons on a polluted stretch in comparison with the pure-water tributary is lower by 15 and 20 times, respectively. In sticklebacks of the genus Pungitius living in the polluted stretch, the part of fish with asymmetry of gill rakers, of rays in pectoral fins, and of lateral scutes is significantly higher (by 2.5 times), as well as the part of asymmetric characters per specimen (by 3.7 times). © 2011 Pleiades Publishing, Ltd. Source

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