Abstract
In the northwestern part of the Sea of Japan, skate Bathyraja parmifera in catches of the bottom trawl occurs at depths of 40 to 830 m at the near-bottom temperature of 0.4–4.9°C. Throughout the year, the skate performs migrations within the continental slope and, in the feeding period, inhabits mainly the depth range of 300 to 500 m. Maximal average density of aggregations of B. parmifera is observed in waters of northern Primorye; minimal average density is observed in Peter the Great Bay and on the Yamato Bank. In catches, skates with a length of 17–130 cm and a weight of 0.5–18.8 kg are recorded; however, fish with a length of 80–115 cm dominate. Individuals with a length of up to 40 cm feed mainly on amphipods, and larger immature and adult individuals feed on decapods, cephalopods, and fish. The value of the daily ration of B. parmifera with its growth decreases from 2.4 to 0.9% of the body weight. Specific ecological features of B. parmifera are a cause of its considerable underfishing by the bottom trawl; therefore, the total resource of this species in the considered region may be at the level of maximal estimates obtained during surveys and comprise no less than 20000 t.
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Original Russian Text © D.V. Antonenko, O.I. Pushchina, S.F. Solomatov, 2007, published in Voprosy Ikhtiologii, 2007, Vol. 47, No. 3, pp. 311–319.
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Antonenko, D.V., Pushchina, O.I. & Solomatov, S.F. Distribution and some biological features of skate Bathyraja parmifera (Rajidae, Rajiformes) in the northwestern part of the Sea of Japan. J. Ichthyol. 47, 279–287 (2007). https://doi.org/10.1134/S0032945207040042
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DOI: https://doi.org/10.1134/S0032945207040042