Temperature-mediated survival, development and hatching variation of Pacific cod Gadus macrocephalus eggs
文献类型： 外文期刊
作者： Bian, X. 1 ; Zhang, X. 2 ; Sakrai, Y. 3 ; Jin, X. 1 ; Gao, T. 2 ; Wan, R. 1 ; Yamamoto, J. 3 ;
作者机构： 1.CAFS, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China
2.Ocean Univ China, Coll Fisheries, Qingdao 266003, Peoples R China
3.Hokkaido Univ, Fac Fisheries, Hakodate, Hokkaido 0418611, Japan
关键词： asynchronous hatching;daily mortality;hatch rank;Mutsu Bay;stage duration;temperature-dependent
期刊名称：JOURNAL OF FISH BIOLOGY （ 影响因子：2.051； 五年影响因子：2.25 ）
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收录情况： SCI
摘要： Laboratory-validated data on the survival, development and hatching responses of fertilized Pacific cod Gadus macrocephalus eggs from the northern Japan stock were determined through an incubation experiment. The optimum temperature for survival until hatching ranged from 4 to 8 degrees C. No significant difference in development rates was found between the populations from Mutsu Bay, Japan, and western Canadian coastal waters even though the samples may belong to different G. macrocephalus stocks. Gadus macrocephalus larvae hatched asynchronously from egg batches despite incubation under the same environment during their development. Both incubation temperature and temperature-mediated hatch rank affect size and yolk reserve. These data suggest that variations in water temperatures within an ecological range markedly influence the development rates, survival and hatching of the eggs, as well as the stage at hatch larvae of G. macrocephalus. Asynchronous hatching and the production of offspring with variable sizes and yolk reserves are considered evolutionary bet-hedging strategies that enable the species to maximize their likelihood of survival in an environment with variable temperatures.
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