Александр Олегович Золотов, кандидат биологических наук, ведущий научный сотрудник
690091; пер. Шевченко, 4; Владивосток
Alexander O. Zolotov, Ph.D., leading researcher
690091; Shevchenko Alley, 4; Vladivostok
На основе данных по размерному составу уловов, биологическому состоянию, а также результатов определения возраста по отолитам исследованы особенности размерно-возрастной структуры уловов, линейного роста и полового созревания восьми массовых видов камбал Карагинского и Олюторского заливов. Выполнен сравнительный анализ половых и межвидовых различий по скорости линейного роста и созревания, а также между несколькими группировками камбал, обитающих на разных участках шельфа п-ова Камчатка и в западной части Берингова моря. Приведены результаты расчетов параметров уравнения роста Берталанфи и оценки длины и возраста 50 %-ного полового созревания самцов и самок для каждого из видов, подтверждена информация о половом диморфизме по темпу линейного роста. Полученные результаты могут быть использованы для оценки запасов дальневосточных камбал и при проведении популяционных исследований.
Size and age structure, linear growth and maturation are considered for eight mass flatfish species in the Karaginsky and Olyutorsky Bays (southwestern Bering Sea) on the data of size measurements and biological analyses in catches and the results of age determination by otoliths. Asymptotic patterns are determined for their growth, with the maximum gains of 4–6 cm per year in the first 3–4 years of life. Sexual dimorphism in linear growth rate with females larger than males is observed for all investigated species. The earliest size difference is noted for alaska plaice — by the end of the first year of life, and the latest for longhead dab — by the age of 6 years. Longhead dab and sakhalin sole reach the body length close to the highest limit earlier than other species; length of their males and females exceeds 90 % of the maximum values in 7 and 10 years for the former species and 8 and 11 years for the latter one, respectively. The longest life expectancy is detected for starry flounder (38 years) and rock sole (31 years), the shortest — for longhead dab (age of the oldest fish did not exceed 15 years). Yellowfin sole, rock sole, and juvenile starry flounder grow faster in the Karaginsky and Olyutorsky Bays than the same species in adjacent areas of the Bering Sea and shelf of Kamchatka. On the contrary, sakhalin sole and longhead dab grow slower in these bays than on the western and eastern Kamchatka shelves. Starry flounder form two ecological groupings in the Karaginsky Bay with different growth rate. After 4–5 years of common life in the coastal zone, one group of this species migrates to greater depth on the shelf where they grow faster than fish in another group that remains at the coast. Longhead dab become mature earlier than other species; 50 % of their females reach sexual maturation at the 4th year of life with the length of 23.0 cm. Alaska plaice and flathead sole are distinguished by the slowest maturing and reach the same level of puberty on average in the age of 9.0 and 9.3 years with the length of 35.0 and 35.3 cm, respectively. The results obtained are useful for the stocks assessment and in population studies of these species.
The authors declare that there are no conflicts of interest present.