Differential Use of the Campbell River Estuary, British Columbia by Wild and Hatchery-Reared Juvenile Chinook Salmon (Oncorhynchus tshawytscha)
Abstract
From March 1982 to December 1983, juvenile chinook salmon (Oncorhynchus tshawytscha) were sampled by beach-seine in the Campbell River estuary and adjacent waters of Discovery Passage in order to examine estuarine use by wild and hatchery stocks. Wild juvenile chinook entered the estuary as migrant fry and were present in the estuarine zone mainly in late April to June, in the transition zone in mid-May to July, and in the marine zone in July. Hatchery fish were released from early May to early July. Maximum catches of wild stocks were similar in the estuarine and transition zones, while the maximum catches of most hatchery stocks were higher in the transition zone. For both wild and hatchery chinook, catches in the marine zone were much lower than in the estuarine and transition zones. Wild fry resided in the estuary for 40–60 d, while most hatchery fish used the estuary for about one-half this period. Wild stocks showed a relatively constant rate of increase in mean size from May to September. Higher rates of increase in the mean size of hatchery fish were shown by groups with earlier release dates and smaller mean sizes. Residency time and growth rates for wild fish were comparable with those observed in an estuary without hatchery fish. Potential for interaction between wild and hatchery stocks was greatest in the transition zone, where hatchery fish were most abundant and because hatchery releases occurred when catches of wild fish were highest in this foreshore area.
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Most estuarine food webs supporting subyearling Chinook salmon are a function of marsh production.
“Most estuarine food webs supporting subyearling Chinook salmon are a function of marsh production (Levings et al. 1986).”
From Evidence‐based evaluation of the cumulative effects of ecosystem restoration (2016) · cites this paper as Levings et al. 1986
The interaction of juvenile salmon with wetland sites can include multiple visits to multiple sites, as well as both direct and indirect interactions with tidal wetlands as the salmon migrate through the lower LCRE.
“Second, the interaction of juvenile salmon with these wetland sites can include multiple visits to multiple sites, as well as both direct and indirect interactions with tidal wetlands as the salmon migrate through the lower LCRE (Healey 1982, Levings et al. 1986, Maier and Simenstad 2009).”
From Evidence‐based evaluation of the cumulative effects of ecosystem restoration (2016) · cites this paper as Levings et al. 1986
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- Authors
- Levings, C. D., McAllister, C. D., & Chang, B. D.
- ORCID
- Levings, C. D.
- Venue
- Canadian Journal of Fisheries and Aquatic Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1986-07-01
- Volume
- 43
- Issue
- 7
- Pages
- 1386-1397
- ISSN
- 0706-652X (ISSN-L)
- 1205-7533
- OpenAlex
- W2142027341
- Cited by
- 79
- References
- 3
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 4 · 2023: 1 · 2021: 2 · 2019: 4 · 2018: 3 · 2017: 1 · 2016: 7 · 2015: 3 · 2014: 2 · 2013: 5 · 2012: 3
- FWCI
- 0.69
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Canadian Journal of Fisheries and Aquatic Sciences (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Keywords
- Oncorhynchus tshawytscha, hatchery-reared fish, wild fish, juvenile salmon, habitat use, residence time, growth rate, Discovery Passage
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