Effect of Finclipping on Survival of Sockeye Salmon (<i>Oncorhynchus nerka</i>)

Weber, Douglas D.; Wahle, Roy J.

doi:10.1139/f69-112

Cited by 23 publications

(14 citation statements)

References 1 publication

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“…A maxillary clip is a simple form of physical mark that has generally been shown to be benign (Stauffer and Hansen 1969;Weber and Wahle 1969) and provides a very effective, easily identified, and durable mark. Nevertheless, removal of bone can occasionally result in deformities that make later mark identification difficult.…”

Section: Discussionmentioning

confidence: 99%

Retention Rates of Passive Integrated Transponder Tags, Visible Implant Elastomer Tags, and Maxillary Marks in Wild Trout

Mamer

Meyer

2016

N American J Fish Manag

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Tagging or marking is a common method to identify individuals or groups of fish, but these tools are compromised if tags or marks are shed or deteriorate over time. We evaluated retention rates of passive integrated transponder (PIT) tags, visible implant elastomer (VIE) tags, and maxillary clips in stream‐dwelling Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri and Rainbow Trout O. mykiss of spawning size. We tagged 2,891 fish ≥150 mm TL with PIT tags in the body cavity, muscle tissue posterior to the cleithrum, or muscle tissue ventral to the dorsal fin. Retention of PIT tags in the body cavity of fish at large for 1 year (72.1%) was lower than those implanted in the dorsal musculature (94.1%) or cleithrum (83.5%) locations. For PIT tags implanted in the body cavity, retention was lower for females (59.4%) than males (89.7%), suggesting that PIT tags implanted in the body cavity were expelled with eggs during spawning events. Retention of PIT tags implanted in the cleithrum and dorsal musculature were unaffected by sex, but retention rates decreased as body size increased for the body cavity tagging location. Annual growth rates were not affected by any PIT tag location. We observed a PIT tag failure rate of 1.7%. The likelihood of a PIT tag being retained in muscle tissue after filleting the fish was highest for the dorsal musculature location (65.1%), followed by the cleithrum (64.9%) and body cavity (4.0%) locations. One‐year retention rates were 95.4% for VIE tags and 93.0% for maxillary clips. While our results demonstrate higher PIT tag retention in the musculature than the body cavity, human consumption concerns may prohibit the use of musculature implantation where angler harvest is possible. Received January 28, 2016; accepted May 11, 2016 Published online August 31, 2016

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Section: Discussionmentioning

confidence: 99%

Retention Rates of Passive Integrated Transponder Tags, Visible Implant Elastomer Tags, and Maxillary Marks in Wild Trout

Mamer

Meyer

2016

N American J Fish Manag

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“…Fin erosion is a common malady of hatchery-raised salmonids and is often used in the field as an indicator of hatchery origin (Sternberg 1988). While some studies on fin clipping have reported detrimental effects of fin loss on survival (Saunders and Allen 1967;Weber and Wahle 1969;Nicola and Cordone 1973;Mears and Hatch 1976), others have reported no significant differences from unclipped fish (Heimer et al 1985; Gjerde and Refstie 1988). However, while the effect of partial fin loss may be minimal, active fin erosion of hatchery fish is often accompanied by microbial infection and hemorrhage (Schneider and Nicholson 1980;Goede and Barton 1990) which could compromise survivability when fish are released into the wild.…”

mentioning

confidence: 99%

A Survey of Trout Fin Erosion, Water Quality, and Rearing Conditions at State Fish Hatcheries in Utah

Bosakowski¹,

Wagner²

1994

J World Aquaculture Soc

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A total of 600 hatchery trout were examined for signs of fin erosion including rainbow trout Oncorhynchus mykiss, cutthroat trout O. clarki, brook trout Salvelinus fontinalis and brown trout Salmo trutta. A scoring system was used to evaluate erosion on all fins from 20 fish samples. Water quality and hatchery rearing variables were also determined for corresponding raceways or ponds. For rainbow trout groups (N= 24), stepwise multiple linear regression was used to interpret the relationship between fin erosion and the other variables. These fish groups averaged between 92 and 243 mm in total length and no significant correlation was observed between length and a fin erosion index (r = 0.045). The best‐fit regression model (adjusted R2= 0.689) suggested that fin erosion was correlated with lower alkalinities, unnatural bottom substrates (concrete or steel), higher unionized ammonia levels, and higher fish densities. Despite significant variation between hatcheries, fin condition was significantly better in rainbow trout than in cutthroat trout in three of four hatcheries containing both species and the same substrate. Fin erosion in rainbow trout occurred primarily on dorsal fins, followed in order of decreasing severity, by pectoral, caudal, anal, and ventral fins.

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“…Some authors suggested that the existence of a high degree of erosion in any of the fins could be a major impediment for migratory movement, escape from predators or to capture prey, and therefore, for survival of the escaped fish (Saunders and Allen, ; Weber and Wahle, ; Nicola and Cordone, ; Mears and Hatch, ). Comparing the swimming performance of farmed and wild seabream, Basaran et al.…”

Section: Discussionmentioning

confidence: 99%

“…This could highlight the idea that such splits in the caudal fins of escaped seabass are the result of having to survive in the wild, although it might not lead to ecological implications for escapees. Some authors suggested that the existence of a high degree of erosion in any of the fins could be a major impediment for migratory movement, escape from predators or to capture prey, and therefore, for survival of the escaped fish (Saunders and Allen, 1967;Weber and Wahle, 1969;Nicola and Cordone, 1973;Mears and Hatch, 1976). Comparing the swimming performance of farmed and wild seabream, Basaran et al (2007) found that wild seabream had a significantly higher critical swimming speed than the farmed fish.…”

Section: Discussionmentioning

confidence: 99%

Does fin damage allow discrimination among wild, escaped and farmed Sparus aurata (L.) and Dicentrarchus labrax (L.)?

et al. 2012

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Summary The present study compares fin damages in gilthead seabream (Sparus aurata) and European seabass (Dicentrarchus labrax) according to their wild, escaped or farmed origins. In addition, the potential applicability of fin condition indices (Fin Erosion Index ‘FEI’ and Fin Splitting Index ‘FSI’) as identification tools is discussed. Farmed seabream fins evidenced more erosion and splitting (FEI ± SD: 2.1 ± 0.3; FSI ± SD: 1.9 ± 0.6) than wild seabream fins (FEI: 0.8 ± 0.6; FSI: 1.2 ± 0.9), a result of farming conditions in open‐sea cages. Escaped seabream fin erosion was between that of farmed and wild seabream (FEI: 1.6 ± 0.4), which could indicate that fins in farmed fish recover over time from farming abrasions once they are in the wild. However, the fins of escaped seabream seem to be weaker than those of the wild fish, and therefore might be more susceptible to suffer other types of erosion such as splitting or nipping (FSI: 2.3 ± 0.7). No significant differences were found in seabass FEI according to their origins, although wild seabass presented significantly more split caudal fins (FSI: 3.3 ± 2.8) than the farmed seabass (FSI: 1.2 ± 1.1) and escapees (FSI: 2.5 ± 1.6). Therefore, FEI for seabream could be used as tools not only to distinguish between wild and farmed fish, but also to identify recent escapees, improving further assessments on the contribution of seabream escapees in fishery landings. However, the healing potential of damaged fins must be considered for the proper identification of escapees. Use of fin condition indices from both species could be helpful for aquaculture management, to assess fish welfare in fish farms stocks, and improve the knowledge of handling, stock densities and open‐sea cage environment conditions.

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Effect of Finclipping on Survival of Sockeye Salmon (Oncorhynchus nerka)

Cited by 23 publications

References 1 publication

Retention Rates of Passive Integrated Transponder Tags, Visible Implant Elastomer Tags, and Maxillary Marks in Wild Trout

Retention Rates of Passive Integrated Transponder Tags, Visible Implant Elastomer Tags, and Maxillary Marks in Wild Trout

A Survey of Trout Fin Erosion, Water Quality, and Rearing Conditions at State Fish Hatcheries in Utah

Does fin damage allow discrimination among wild, escaped and farmed Sparus aurata (L.) and Dicentrarchus labrax (L.)?

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