The Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, CAFS, Qingdao 266071, China.
J Fish Biol. 2014 Jan;84(1):85-105. doi: 10.1111/jfb.12257. Epub 2013 Dec 17.
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°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.
通过孵化实验，确定了来自日本北部海域的太平洋鳕鱼（ Gadus macrocephalus ）受精卵的存活、发育和孵化反应的实验室验证数据。存活到孵化的最佳温度范围为 4 至 8°C。尽管样本可能属于不同的 Gadus macrocephalus 种群，但来自日本 Mutsu 湾和加拿大西部沿海水域的种群之间的发育率没有显著差异。尽管在发育过程中在相同的环境下孵化，但 Gadus macrocephalus 幼虫从卵批量中异步孵化。孵化温度和温度介导的孵化等级都会影响大小和卵黄储备。这些数据表明，生态范围内水温的变化明显影响 Gadus macrocephalus 的卵的发育率、存活率和孵化率，以及孵化时幼虫的阶段。异步孵化和产生具有不同大小和卵黄储备的后代被认为是进化上的套期保值策略，使该物种能够在温度变化的环境中最大限度地提高其生存的可能性。
