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Effects of sedimentation on the gravels of an industrial river system
Author(s) -
Turnpenny A. W. H.,
Williams R.
Publication year - 1980
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1980.tb02802.x
Subject(s) - salmo , siltation , hatching , biology , rainbow trout , fishery , sedimentation , trout , incubation , brown trout , fish <actinopterygii> , zoology , sediment , paleontology , biochemistry
The natural recovery of trout ( Salmo trutta L.) populations in an industrial river, the Ebbw Fawr, South Wales, has been depressed by problems of natural recruitment. Rainbow trout ( Salmo gairdneri Richardson) eggs were planted in river gravels to assess the effects of siltation on salmonid spawning success. In reaches where siltation due to the coal industry has occurred, 98–100% of eggs died during incubation in the gravels. Experiments using standpipe techniques measured gravel permeabilities and rates of dissolved oxygen (DO) supply to artificially planted eggs, the results showed a strong dependence of hatching success and alevin size on these two parameters. The median lethal DO supply rate was about 50 μg cm ‐2 h ‐1 .