Replacement of Wild Coho Salmon by Hatchery-Reared Coho Salmon in the Strait of Georgia over the past Three Decades

Sweeting, R. M.; Beamish, Richard; Noakes, Donald J.; Neville, Chrys

doi:10.1577/1548-8675(2003)023<0492:rowcsb>2.0.co;2

Cited by 55 publications

(59 citation statements)

References 21 publications

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“…Reducing vaterite prevalence may also be important for wild fish conservation and stock enhancement, as restocking (or supportive breeding) programmes rely on the survival of hatchery-reared juveniles (Sweeting et al, 2003). Rearing environments are typically optimised to maximise juvenile size at release, with the aim of reducing mortality (Cross et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Rapid growth causes abnormal vaterite formation in farmed fish otoliths

Reimer

Dempster

Wargelius

et al. 2017

Journal of Experimental Biology

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Sagittal otoliths are essential components of the sensory organs that enable all teleost fish to hear and maintain balance, and are primarily composed of calcium carbonate. A deformity, where aragonite (the normal crystal form) is replaced with vaterite, was first noted over 50 years ago but its underlying cause is unresolved. We evaluated the prevalence of vateritic otoliths from two captive rearing studies which suggested that fast growth, due to environmental rather than genetic control, led to vaterite development. We then tested this by varying light and temperature to create phenotypes with different growth rates, which resulted in fast growers (5 times larger) having 3 times more vaterite than slow growers. A decrease in either the ratio of otolith matrix proteins (otolin-1/OMM-64) or [Ca 2+ ]/[CO 32− ] may explain why fast growth causes vaterite deposition. As vaterite decreases hearing sensitivity, reducing growth rates in hatcheries may improve the welfare of farmed fish and increase the success of conservation efforts.

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Section: Discussionmentioning

confidence: 99%

Rapid growth causes abnormal vaterite formation in farmed fish otoliths

Reimer

Dempster

Wargelius

et al. 2017

Journal of Experimental Biology

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“…The trawl survey methodology and trawl net design are reported in Beamish et al (2000) and Sweeting et al (2003). The set locations within the Gulf Islands, Strait of Georgia and Juan de Fuca Strait are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Wild chinook salmon survive better than hatchery salmon in a period of poor production

et al. 2011

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“…Fishing was conducted during daylight hours with sets of 15 to 30 minutes duration. The net was towed with the head rope either at the surface, or at 15 m, 30 m, 45 m or 60 m, with the majority of eff ort in the top 30 m. A more detailed description of the protocols and gear are described in Beamish et al (2000) and Sweeting et al (2003). This survey fi shed standard track lines that have been used for juvenile salmon surveys in the SOG since 1998 (Fig.…”

Section: Migration Through the Strait Of Georgiamentioning

confidence: 99%

Initial Estimates from an Integrated Study Examining the Residence Period and Migration Timing of Juvenile Sockeye Salmon from the Fraser River through Coastal Waters of British Columbia

Neville¹,

Johnson²,

Beacham³

et al. 2016

NPAFC Bull.

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Many stocks of Pacifi c salmon enter into and transit through the Strait of Georgia during their migration to off shore waters. Knowledge of the duration of juvenile sockeye salmon residency in the Strait of Georgia and when they migrate out of the strait is essential to understand both natural and anthropogenic factors that may be regulating their early marine survival. We present results from the fi rst year of a multi-year integrated study that demonstrates stock-specifi c diff erences in the migration timing of juvenile Fraser River sockeye salmon over the fi rst eight to 12 weeks of their marine life. The geography of the study region provides a unique opportunity to sample virtually the entire population as they migrate down the Fraser River and as they leave the Strait of Georgia through the Discovery Islands and lower Johnstone Strait. This analysis indicated that juvenile 1-year-old sockeye salmon were resident in the Strait of Georgia for seven to eight weeks in 2014. The catch rates in the Discovery Islands indicated that, in 2014, the peak migration period for Fraser River sockeye salmon occurred over approximately two weeks, with about 80% of all sockeye salmon caught between June 12 and June 19. The results suggest that the Strait of Georgia and the Discovery Islands/Johnstone Strait regions function in a similar manner as the nursery lakes and main river ways in the Fraser River watershed. The Strait of Georgia provides abundant food in a relatively protected habitat similar to their rearing lakes in the watershed. The Discovery Islands and Johnstone Strait, an area of lower food availability, is similar to the river, where fi sh move in concentrated numbers through high current fl ow areas over a relatively short period of time.

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Replacement of Wild Coho Salmon by Hatchery-Reared Coho Salmon in the Strait of Georgia over the past Three Decades

Cited by 55 publications

References 21 publications

Rapid growth causes abnormal vaterite formation in farmed fish otoliths

Rapid growth causes abnormal vaterite formation in farmed fish otoliths

Wild chinook salmon survive better than hatchery salmon in a period of poor production

Initial Estimates from an Integrated Study Examining the Residence Period and Migration Timing of Juvenile Sockeye Salmon from the Fraser River through Coastal Waters of British Columbia

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