Precocious and non-precocious 2-year-old rainbow trout (Salmo gairdneri) were observed for growth and relative survival for two consecutive years in a lake which was initially barren. In the first year, post-spawning precocious males weighed 39% more than the non-precocious fish when sampled as 2+ fish in the fall. In the second year, post-spawning precocious males weighed 7% less than the non-precocious fish.
There was no difference in relative survival of the post-spawning precocious males compared to the non-precocious fish in the first year, but in the following year, relative survival of precocious males was 54% of non-precocious fish.
Although results are somewhat contradictory, they indicate that precocious males may not contribute significantly to a sports fishery and should be reduced or eliminated from a hatchery stocking programme.
Tsumura, Kanji, Hume, Jeremy. 1987. Post-spawning Growth and Relative Survival of Precocious Rainbow Trout (Salmo gairdneri). BC Ministry of Environment and Parks. Fisheries Project Report. RD4
Topic: Fish and Fish Habitats
Keywords: British Columbia, BC, Lunborn, Hatheume, Menzies Lake, Merritt, Thompson, stocking, fry, juvenile, predator, non-precocious, sport, fishery, angling
Scientific Name: Oncorhynchus mykiss
English Name: Rainbow Trout
Other Identifier: FPR RD4
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