Aineiston tiedot

Tekijä (t):Fukushima, Michio
Quinn, Terrance
Smoker, William W.
Aineiston nimi:Estimation of eggs lost from superimposed salmon (Oncorhynchus gorbuscha) redds
Asiasanat:arviointi, kuolleisuus, kutu, kyttyrälohi, lohikalat
Lehti/sarja ym.:
Lisätietoa:Eripainos: Canadian Journal of Fisheries and Aquatic Sciences, March 1998: pages 618-625 This study investigated whether repeated use of limited spawning grounds (i.e., redd superimposition) by pink salmon (Oncorhynchus gorbuscha) can cause density-dependent mortality. Loss of eggs from part of Auke Creek, Alaska, was estimated from a series of mark-recapture experiments and maximum likelihood models. The number of eggs lost per day during the 5-week spawning season and for 2 weeks afterward was roughly proportional to spawner abundance and weakly related to stream discharge. Freshets after cessation of spawning induced negligible egg loss. The maximum daily egg loss estimated by one model was 398 000 eggs (80% CI = 267 000 - 1 581 000) or equivalently a loss of about 300 female spawners when the daily spawner abundance (both male and female) in the study area was at most 1000.
Sijainti:I-Kalatutkimus: Kyttyrälohi (avokotelo 1)