КамчатНИРО
91
yearsKamchatka Research Institute of Fisheries and Oceanography
years
Journal / Archives
УДК 597.553.2DOI: Download the full article
Biological characteristics for chinook salmon oncorhynchus tschawytcha (walbaum) of the Kamchatka river basin
Materials including both historical and present-day data are presented in this article. Analysis of the population structure of Chinook salmon of the Kamchatka River has been carried out. The aggregated biostatistical data provide evidence that the following considerable changes have occurred by the present time: “rejuvenation”, declines in the average size, reduction of the fecundity of females and their number.
The stock abundance of Chinook salmon of the Kamchatka River basin shows a significant decreasing trend caused by abrupt diminution of run size.
УДК 597.553.2 DOI: 10.15853/2072-8212.2018.50.5-26Download the full article
The status of the pacific salmon stocks in the rivers Nalychevo, Ostrovnaya and Vakhil (South-East Kamchatka) in 1980–2017
Stock abundance dynamics of sockeye salmon, pink salmon, chum salmon and coho salmon for the last 37 years was analyzed in the rivers Nalycheva, Ostrovnaya and Vakhil. Biological characteristics of spawners (including Chinook salmon) were analyzed in Nalycheva River, and a comparison to Ostrovnaya River was made for the first time (on the data about Nalycheva for 2017). Temporal groups were revealed for all salmon species (in exception of Chinook salmon) in the Nalycheva, and biological differences are demonstrated in case of occurence. Spatial and temporal diversity of Pacific salmon in each of the rivers mentioned was evaluated, and it is concluded, that urgent measures are required to protect salmon stocks in the rivers Nalycheva and Ostrovnaya were made.