Author: Nathan Gail SmithPublisher:
ISBN:
Category :
Languages : en
Pages : 154
Book Description
Natural Reproduction and Recruitment of Chinook Salmon in the Salmon River, NY
Author: Nathan Gail SmithNatural Reproduction and Recruitment of Chinook Salmon in the Salmon River, New York: An Application of Otolith Microstructure Analysis
Author: Nathan Gail SmithPublisher:
ISBN: 9780542350764
Category :
Languages : en
Pages : 72
Book Description
Stocking of hatchery-reared Chinook salmon (Oncorhynchus tshawytscha) in Lake Ontario has led to the development of a sport fishery that provides high economic returns to local communities. Changes in habitat quality, including changes in flow associated with Federal Energy Regulatory Commission reauthorization protocols since the mid 1990s in the Salmon River, NY, may have led to increased natural reproduction in this river. Increases in natural production of Chinook in Lake Ontario could lead to changing management practices in the fishery. In order to measure wild reproduction I used known origin young-of-the-year (YOY) Chinook salmon from hatchery and wild sources as a baseline for separating these groups using otolith microstructure. Measuring 20 days growth from 300 mum inward toward the origin correctly classified 100% of known hatchery fish, and 89% of known wild fish. These measurements were used to determine the origin of Chinook salmon smolts caught in the nearshore of Lake Ontario adjacent to the Salmon River, NY in 2000 (85%) and 2001 (89%). I also evaluated the potential for carbon and oxygen stable isotopes in otoliths for differentiation of hatchery and wild YOY Chinook. Stable isotope methods show promise in separating hatchery and wild fish based on known-origin otoliths from 1999 and 2001, but further research is required before large scale application in Lake Ontario. In addition to sampling outmigrating smolts, I applied the 300 mum method to a sample of adults returning to the Salmon River from 2000-2002. Wild origin fish contributed between 10 and 25% of the returning adults for the 6 year classes 1995-2000. There was no time trend in the proportion of wild fish and therefore no evidence for an increase in natural production due to water flow changes in the Salmon River during the late 1990s. Because of the life history of Chinook salmon and time limitations of the study, I was unable to directly compare estimates of smolts from 2000-2001 with returning adults from those year classes, however my results for both YOY and adult Chinook indicate that natural reproduction may play a larger role in Lake Ontario than previously thought.
Natural Reproduction and Spawning Site Characteristics of Chinook Salmon (Oncorhynchus Tshawytscha) in the Salmon River, New York
Author: Dustin W. EverittPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 184
Book Description
Food web constraints on Chinook salmon recruitment in a large Lake Michigan tributary
Author: Damon M. KruegerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 308
Book Description
Natural reproduction of Chinook salmon now supplies half of all recruits to the Lake Michigan sport fishery but may vary greatly due to environmental variability and biotic interactions in tributary nursery areas. From 2004 to 2007, I evaluated the relative effect of predation by stocked sport fish species on Chinook salmon recruitment variability in the Muskegon River, a large Lake Michigan tributary. Together, walleye and brown trout annually consumed from 17 to 47% of available Chinook salmon parr. Although brown trout consumed large quantities of Chinook parr, I found that hatchery trout dominated walleye diets. Walleye were size-selective for small hatchery trout but prey size was independent of predator size. In general, walleye showed neutral selection for prey species although they positively selected for rainbow trout and selected against Chinook parr in some years. Brown trout consumed smaller-than-average Chinook salmon parr although prey size was also independent of predator size. Chinook parr were positively selected as prey by brown trout but only in April when parr were
Fishery Bulletin
Author: Spatial and Temporal Distribution of Wild and Hatchery Juvenile Chinook Salmon in Nearshore Lake Ontario
Author: Micah John DeanDissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 848
Book Description
Rearing of Chinook Salmon in Tributaries of the South Fork Salmon River, Idaho
Author: William S. PlattsPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 20
Book Description
The Potential for Natural Reproduction of Chinook Salmon in the Chippewa River, Isabella County, Michigan
Author: Dennis Jay HamlinPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 142
Book Description
Coastlines
Author: Publisher:
ISBN:
Category : Coastal zone management
Languages : en
Pages : 264
Book Description