On Biology of Sockeye Salmon Oncorhynchgus Nerka From the Zhupanova River (East Kamchatka)

Abstract

икр., встречаемость самок -55,3 %. В отличие от нерки ряда рек восточного побережья Камчатки, у нерки р. Жупанова за рассмотренный период отсутствует достоверный меж-годовой негативный тренд длины и массы тела.Ключевые слова: возраст, половозрелая нерка, длина и масса тела, плодовитость.

Genetic Structuring and Conservation of Asian Sockeye Salmon: Identification of Regional Stock Complexes

“…This region is characterized by a severe subarctic climate featuring long cold winters and short rainy summers. Palansky Lake, for example, remains ice-covered until late June, with ice cover fully restored by the end of October (Bugaev et al, 2002). The northern geographical location of the Palana River, far from the ocean growing areas, causes extensive migration of juvenile sockeye salmon along the coast of Western Kamchatka to reach the Pacific Ocean for feeding.…”

“…Furthermore, a distinctive feature of this population is that the spawning and freshwater feeding of juvenile sockeye salmon before migration to the sea are predominantly concentrated within the Palansky Lake. Here, in the vast majority of cases, sockeye salmon spend approximately 2 years (Bugaev et al, 2002), so all Palana sockeye salmon can be classified as a lake ecotype.…”

“…The northern geographical location of the Palana River, far from the ocean growing areas, causes extensive migration of juvenile sockeye salmon along the coast of Western Kamchatka to reach the Pacific Ocean for feeding. This migratory pattern inevitably impacts their biological characteristics and population dynamics (Bugaev et al, 2002).…”