Lake Roosevelt Fisheries Monitoring Progam; Thyroid-Induced Chemical Imprinting in Early Life Stages and Assessment of Smoltification in Kokanee Salmon Implications for Operating Lake Roosevelt Kokanee Salmon Hatcheries; 1993 Supplement Report.

Technical Report · Wed Jun 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10194657· OSTI ID:10194657

Tilson, Mary Beth; Galloway, Heather; Scholz, Allan T ^[1]

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1. Eastern Washington University, Upper Columbia United Tribes Fisheries Research Center, Cheney, WA

In 1991, two hatcheries were built to provide a kokanee salmon and rainbow trout fishery for Lake Roosevelt as partial mitigation for the loss of anadromous salmon and steelhead caused by construction of Grand Coulee Dam. The Sherman Creek Hatchery, located on a tributary of Lake Roosevelt to provide an egg collection and imprinting site, is small with limited rearing capability. The second hatchery was located on the Spokane Indian Reservation because of a spring water source that supplied cold, pure water for incubating and rearing eggs.`The Spokane Tribal Hatchery thus serves as the production facility. Fish reared there are released into Sherman Creek and other tributary streams as 7-9 month old fry. However, to date, returns of adult fish to release sites has been poor. If hatchery reared kokanee imprint to the hatchery water at egg or swim up stages before 3 months of age, they may not be imprinting as 7-9 month old fry at the time of stocking. In addition, if these fish undergo a smolt phase in the reservoir when they are 1.5 years old, they could migrate below Grand Coulee Dam and out of the Lake Roosevelt system. In the present investigation, which is part of the Lake Roosevelt monitoring program to assess hatchery effectiveness, kokanee salmon were tested to determine if they experienced thyroxine-induced chemical imprinting and smoltification similar to anadromous salmonids. Determination of the critical period for olfactory imprinting was determined by exposing kokanee to different synthetic chemicals (morpholine or phenethyl alcohol) at different life stages, and then measuring the ability to discriminate the chemicals as sexually mature adults. Whole body thyroxine content and blood plasma thyroxine concentration was measured to determine if peak thyroid activity coincided with imprinting or other morphological, physiological or behavioral transitions associated with smoltification.

• Research Organization: Eastern Washington Univ., Cheney, WA (United States). Upper Columbia United Tribes Fisheries Research Center
• Sponsoring Organization: United States. Bonneville Power Administration.
• OSTI ID: 10194657
• Report Number(s): DOE/BP-91819-7; ON: DE95003116
• Country of Publication: United States
• Language: English

Related Subjects

13 HYDRO ENERGY
130600
54 ENVIRONMENTAL SCIENCES
550800
551000
59 BASIC BIOLOGICAL SCIENCES
ACTIVITY LEVELS
DOSE-RESPONSE RELATIONSHIPS
ENVIRONMENTAL ASPECTS
ENVIRONMENTAL EFFECTS
FISHERIES
HYDROELECTRIC POWER PLANTS
MIGRATION
MITIGATION
MORPHOLOGICAL CHANGES
MORPHOLOGY
PHYSIOLOGICAL SYSTEMS
SALMON
Salmon fisheries - Northwest
Pacific
THYROID
THYROXINE
TROUT