期刊
FISHERIES MANAGEMENT AND ECOLOGY
卷 7, 期 3, 页码 225-237出版社
WILEY-BLACKWELL
DOI: 10.1046/j.1365-2400.2000.00177.x
关键词
brown trout; competition; rainbow trout; spawning
类别
Spawning runs of brown trout Salmo trutta L., and rainbow trout, Oncorhynchus mykiss Walbaum, were compared in three tributaries of two lakes for timing, numbers and redd characteristics. Redd characteristics for the two species in four other streams were examined. No significant differences in redd characteristics between the two species were observed, but in all lake tributaries the possibilities of superimposition of spring spawning rainbow trout on redds of brown trout were examined. A common feature was the high ratio of numbers of spawners to the area of preferred spawning gravel, and it was concluded that in the lake tributaries, superimposition resulted in increased mortality of brown trout eggs, and in one case elimination of the brown trout population. Management possibilities for control of the species proportions in comparable situations are discussed.
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