Features of fishery and indices of reproduction for pink salmon Oncorhynchus gorbuscha of Iturup Island (Kuril Islands)

Annual data on the 1976–2019 year-classes of pink salmon from Iturup Island are presented, as their number spawning grounds, abundance wild and hatchery juveniles migrating downstream, returns adult fish after marine period life. On average, 1.48 . 106 spawners entered annually rivers in these years 237 fry rolled down (the downstream migration index was 165 per conventional producer), plus 133 hatcheries. After fattening sea, annual were 16.56 ind., so survival 4.70 %. This is highest value return for Sakhalin-Kuril region, relative to area grounds spawners. The odd dominated until middle 1990s, then even became more numerous. Biological parameters (body length weight, fecundity) fluctuated year both year-classes, though averaged a long observation had no difference between well indices reproduction efficiency.