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Regulatory effect of surfagon—a synthetic analog of gonadotropin-releasing hormone—on the gonad state of rainbow trout (Kamchatka steelhead Parasalmo mykiss (=Oncorhynchus mykiss)) juveniles is investigated. The juveniles were 2.5 months old and were exposed to brief (4 days) heat stress (19–20°C). The increase of water temperature was followed by anomalies of gonads after 1 month (destruction of...
Growth, age composition, gonad maturity and patterns of life history strategy adoption in the population of Dolly Varden from the Kol River (West Kamchatka) are studied. Major factors controlling differentiation of juveniles and trajectories of ontogenetic developments, growth rate and gametogenesis in generations in particular years. The differentiation in a generation into anadromous and resident...
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