Title: Effects of fine sediment on fish populations
Author: Thurow, Russ; King, Jack;
Source: In: Fan, Shou-Shan; Kuo, Yung-Huang, eds. Proceedings of the Fifth Federal Interagency Sedimentation Conference, Vol. 2; March 18-21, 1991; Las Vegas, NV. Interagency Advisory Committee on Water Data, Subcommittee on Sedimentation. p. 11-49-11-56.
Publication Series: Paper (invited, offered, keynote)
Description: To describe conditions in natural redds of steelhead trout (Oncorhynchus mykiss), we evaluated the particle size distribution of egg pockets, redd pits and tailspills, artificially constructed redds, and undisturbed substrate outside redds. Egg pockets were located in upper strata an average of 14.9 cm below the substrate surface. Egg pockets contained fewer fines (<6.35 mm) than other sites, except in artificial redds. As substrate depth increased, percent fines tended to increase at all sampling sites and variability in percent fines among sites was reduced. We observed no change in percent fines sampled from May to July, except in cleaned intrusion sites where free interstitial areas rapidly accumulated sediments. Dissolved oxygen levels declined in redds during incubation. Limitations of the data are discussed.
Keywords: sediment, natural redds, steelhead trout, Oncorhynchus mykiss
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Thurow, Russ; King, Jack. 1991. Effects of fine sediment on fish populations. In: Fan, Shou-Shan; Kuo, Yung-Huang, eds. Proceedings of the Fifth Federal Interagency Sedimentation Conference, Vol. 2; March 18-21, 1991; Las Vegas, NV. Interagency Advisory Committee on Water Data, Subcommittee on Sedimentation. p. 11-49-11-56.
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