Evaluation of salmon and steelhead spawning habitat quality in the South Fork Trinity River Basin, 1997

Borok, Sara L. and Jong, Howard W. (1997) Evaluation of salmon and steelhead spawning habitat quality in the South Fork Trinity River Basin, 1997. Sacramento, CA, California Department of Fish and Game, (Inland Fisheries Division Administrative Report, 97-8)

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Abstract

Sediment sampling was used to evaluate chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) spawning habitat quality in the South Fork Trinity River (SFTR) basin. Sediment samples were collected using a McNeil-type sampler and wet sieved through a series of Tyler screens (25.00 mm, 12.50 mm, 6.30 mm, 3.35 mm, 1.00 mm, and 0.85 mm). Fines (particles < 0.85 mm) were determined after a l0-minute settling period in Imhoff cones. Thirteen stations were sampled in the SFTR basin: five stations were located in mainstem SFTR between rk 2.1 and 118.5, 2 stations each were located in EF of the SFTR, Grouse Creek, and Madden Creek, and one station each was located in Eltapom and Hayfork Creeks. Sample means for fines(particles < 0.85 mm) fer SFTR stations ranged between 14.4 and 19.4%; tributary station sample mean fines ranged between 3.4 and 19.4%. Decreased egg survival would be expected at 4 of 5 mainstem SFTR stations and at one station in EF of SFTR and Grouse Creek where fines content exceed 15%. Small gravel/sand content measured at all stations were high, and exceed levels associated with reduced sac fry emergence rates. Reduction of egg survival or sac fry emergence due to sedimentation in spawning gravels could lead to reduced juvenile production from the South Fork Trinity River. (PDF contains 18 pages.)

Item Type: Monograph or Serial Issue
Title: Evaluation of salmon and steelhead spawning habitat quality in the South Fork Trinity River Basin, 1997
Personal Creator/Author:
CreatorsEmail
Borok, Sara L.
Jong, Howard W.
Series Name: Inland Fisheries Division Administrative Report
Number: 97-8
Date: 1997
Publisher: California Department of Fish and Game
Place of Publication: Sacramento, CA
Issuing Agency: California Department of Fish and Game
Uncontrolled Keywords: sediment; habitat; chinook salmon; Oncorhynchus tshawytscha; steelhead; Oncorhynchus mykiss; South Fork Trinity River Basin; Grouse Creek; Madden Creek; Eltapom Creek; Hayfork Creek
Subjects: Ecology
Fisheries
Earth Sciences
Item ID: 2845
Depositing User: Joan Parker
Date Deposited: 17 Feb 2010 12:52
Last Modified: 29 Sep 2011 18:14
URI: http://aquaticcommons.org/id/eprint/2845

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