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Title: Development of a Natural Rearing System to Improve Supplemental Fish Quality, 1996-1998 Progress Report.

Abstract

This report covers the 1996-1998 Natural Rearing Enhancement System (NATURES) research for increasing hatchery salmon postrelease survival and producing fish with more wild-like behavior, physiology, and morphology prior to release. Experiments were conducted evaluating automatic subsurface feeders; natural diets; exercise systems; seminatural raceway habitat enriched with cover, structure, and substrate; and predator avoidance conditioning for hatchery salmonids. Automatic subsurface feed delivery systems did not affect chinook salmon depth distribution or vulnerability to avian predators. Live-food diets only marginally improved the ability of chinook salmon to capture prey in stream enclosures. A prototype exercise system that can be retrofitted to raceways was developed, however, initial testing indicated that severe amounts of exercise may increase in culture mortality. Rearing chinook salmon in seminatural raceway habitat with gravel substrate, woody debris structure, and overhead cover improved coloration and postrelease survival without impacting in-culture health or survival. Steelhead fry reared in enriched environments with structure, cover, and point source feeders dominated and outcompeted conventionally reared fish. Exposing chinook salmon to caged predators increased their postrelease survival. Chinook salmon showed an antipredator response to chemical stimuli from injured conspecifics and exhibited acquired predator recognition following exposure to paired predator-prey stimuli. The report also includes themore » 1997 Natural Rearing System Workshop proceedings.« less

Authors:
Publication Date:
Research Org.:
United States. National Oceanic and Atmospheric Administration.
Sponsoring Org.:
United States. Bonneville Power Administration.
OSTI Identifier:
789584
Report Number(s):
DOE/BP-00004768-1
TRN: US200201%%198
DOE Contract Number:  
00004768
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Sep 2001; Related Information: "1996-1998 : final report."--cover page ; prepared by Desmond J. Maynard, ... [et al.].
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AVOIDANCE; COLORATION; DISTRIBUTION; HABITAT; MORPHOLOGY; MORTALITY; PHYSIOLOGY; POINT SOURCES; REARING; SALMON; STIMULI; TESTING; VULNERABILITY; HATCHERY FISHES - MORTALITY; CHINOOK SALMON - NORTHWEST, PACIFIC; FISHERY RESOURCES - HATCHERY VS. WILD STOCKS - NORTHWEST, PACIFIC

Citation Formats

Maynard, Desmond J. Development of a Natural Rearing System to Improve Supplemental Fish Quality, 1996-1998 Progress Report.. United States: N. p., 2001. Web. doi:10.2172/789584.
Maynard, Desmond J. Development of a Natural Rearing System to Improve Supplemental Fish Quality, 1996-1998 Progress Report.. United States. doi:10.2172/789584.
Maynard, Desmond J. Thu . "Development of a Natural Rearing System to Improve Supplemental Fish Quality, 1996-1998 Progress Report.". United States. doi:10.2172/789584. https://www.osti.gov/servlets/purl/789584.
@article{osti_789584,
title = {Development of a Natural Rearing System to Improve Supplemental Fish Quality, 1996-1998 Progress Report.},
author = {Maynard, Desmond J},
abstractNote = {This report covers the 1996-1998 Natural Rearing Enhancement System (NATURES) research for increasing hatchery salmon postrelease survival and producing fish with more wild-like behavior, physiology, and morphology prior to release. Experiments were conducted evaluating automatic subsurface feeders; natural diets; exercise systems; seminatural raceway habitat enriched with cover, structure, and substrate; and predator avoidance conditioning for hatchery salmonids. Automatic subsurface feed delivery systems did not affect chinook salmon depth distribution or vulnerability to avian predators. Live-food diets only marginally improved the ability of chinook salmon to capture prey in stream enclosures. A prototype exercise system that can be retrofitted to raceways was developed, however, initial testing indicated that severe amounts of exercise may increase in culture mortality. Rearing chinook salmon in seminatural raceway habitat with gravel substrate, woody debris structure, and overhead cover improved coloration and postrelease survival without impacting in-culture health or survival. Steelhead fry reared in enriched environments with structure, cover, and point source feeders dominated and outcompeted conventionally reared fish. Exposing chinook salmon to caged predators increased their postrelease survival. Chinook salmon showed an antipredator response to chemical stimuli from injured conspecifics and exhibited acquired predator recognition following exposure to paired predator-prey stimuli. The report also includes the 1997 Natural Rearing System Workshop proceedings.},
doi = {10.2172/789584},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {9}
}

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