Seasonality of Reproduction and Embryonic Growth of Spiny Dogfish (Squalus acanthias L., 1758) in the Eastern Black Sea

Authors : Sefa Ayhan DEMİRHAN, Kadir SEYHAN

Pages : 433-443

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The seasonality of reproduction and embryonic development of spiny dogfish insert ignore into journalissuearticles values(Squalus acanthias); sampled from the Eastern Black Sea were studied. The gestation period of spiny dogfish, starting in August, September and October, takes around 23-24 months. Fertilized females were caught at a depth of 30-45 m in July and August. Females with full-term pups and empty uteri were found at 50-60 m depth, where the temperature was 10 °C. Lengths of pups at birth were around 28-29 cm, whereas their weights ranged from 68 to 78 g. The models of embryonic growth and development of ova were described as TLe = 0.8124 – 0.334 x mo + 0.1289 x mo2 - 0.03 x mo3 insert ignore into journalissuearticles values(r = 0.92); and Do = 0.7364 – 0.1503 x mo + 0.0221 x mo2 - 0.004 x mo3 insert ignore into journalissuearticles values(r = 0.94);, respectively.
Keywords : Reproduction, embryo, Squalus acanthias, Black Sea