Embryonic and larval development of pacific cod Gadus macrocephalus from the Tauyskaya Bay (northern Okhotsk Sea)

• Published in: Izvestiya TINRO
• Main Author: Ravil R. Yusupov
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Transactions of the Pacific Research Institute of Fisheries and Oceanography 2015
• Subjects: тихоокеанская треска; эмбриональное развитие; эмбрион; предличинка; личинка; Aquaculture. Fisheries. Angling; SH1-691; Okhotsk; Pacific; Teardrop; okhotsk sea
• Online Access: https://doi.org/10.26428/1606-9919-2015-182-23-37; https://doaj.org/article/08a00f9ccf8f4ac2840782a596e82ba8

Early embryogenesis and post-embryonic development of pacific cod Gadus macrocephalus Tilesius from the Tauyskaya Bay is investigated in experiment. Its fertilized eggs at stage II had the diameter 1.000-1.250 mm, on average 1.103 ± 0.003 mm. Numerous teardrop-shaped inclusions were observed in plasma of the blastodisk and in the blastomeres, presumably important for prevention of the eggs freezing under low temperature during incubation in vivo . Duration of the embryogenesis in vitro under the temperature 2.2 and 5.2оC was 490 and 768 hours, respectively. The prelarvae hatched at the length 4.28-5.10 mm, on average 4.34 ± 0.03 mm, and turned to mixed and exogenous feeding in 6 and 10 days, at the mean length 4.97 and 5.18 mm, respectively.