Arrow-Toothed Halibuts Atheresthes spp. (Pleuronectiformes, Pleuronectidae) and Their Role in the Fish Community of Olyutorsky-Navarin Region and Adjacent Areas of the Bering Sea

摘要

Based on the trawl surveys of 1996—2012, regularities and biological features have been studied in the arrow-toothed halibuts (Atheresthes evermanni and A. stomias) from Olyutorsky-Navarin region and adjacent waters of the Bering Sea. The abundance of the species has increased since 2004. Their remunerative concentrations have been found on the continental slope and shelf. The majority of fish captured during our survey were mature specimens with a length of 37—54 cm and a weight of 0.8—1.4 kg; inthe course of our investigation, there was a trend towards a decrease in the average sizes. According to the data obtained in the recent years, if one considers the biomass parameters, arrow-toothed halibuts are among ten dominant species (0.1—0.5% ofthe total biomass of fish registered in Olyutorsky-Navarin region) and prevail among flatfish (Pleuronectidae). Currently, arrow-toothed flounders are undesirable bycatch in the fishery of Reinhard-tius hippoglossoides and Hippoglossus stenolepis.