Incidental fishing mortality may be responsible for the death of ten billion juvenile sea scallops in the mid-Atlantic

Stokesbury, Kevin D. E.; Carey, Jonathan D.; Harris, Bradley P.; O’Keefe, Catherine E.

doi:10.3354/meps09020

Cited by 16 publications

(22 citation statements)

References 26 publications

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“…They based their conclusion on the observed substantial decline in sea scallop abundance between 2003 and 2004, which they attributed to discarding because other potential causes seemed unlikely. We show that (1) the pattern of mortality described by Stokesbury et al (2011) is not consistent with high mortality due to discarding; (2) direct estimates of discarding from at-sea observers are more than an order of magnitude lower than the 10 billion discards suggested by Stokesbury et al (2011); and (3) predation related to the extremely high juvenile scallop densities observed in 2003 is a likely and credible alternative explanation for the decline.…”

Section: Introductionmentioning

confidence: 81%

“…because of dredge rings being clogged with scallops or debris, fishing-related mortality rates could still not be higher in small scallops than in large ones. Therefore, we find that the data in Stokesbury et al (2011) are inconsistent with high mortality from discarding.…”

Section: Patterns Of Mortalitymentioning

confidence: 89%

“…However, it is evident from Fig. 4 of Stokesbury et al (2011) that there was a much greater proportional reduction in the number of small scallops than large ones, indicating that the mortality rate was much higher for small scallops well below commercial size than it was for larger scallops. Even if the dredge was less selective for large scallops, e.g.…”

Section: Patterns Of Mortalitymentioning

confidence: 92%

“…Accurate estimation of discards is therefore important for understanding the dynamics of the discarded species and the effects of fisheries on marine ecosystems. Stokesbury et al (2011) concluded that 10 billion sea scallops Placopecten magellanicus -over half of the entire estimated scallop population -were probably killed by being discarded during scallop fishery operations in the Mid-Atlantic Bight be tween 2003 and 2004. They based their conclusion on the observed substantial decline in sea scallop abundance between 2003 and 2004, which they attributed to discarding because other potential causes seemed unlikely.…”

Section: Introductionmentioning

confidence: 99%

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ABSTRACT: Stokesbury et al (2011; Mar Ecol Prog Ser 425:167−173) concluded that 10 billion sea scallops Placopecten magellanicus probably died from discarding during fishing operations between surveys in 2003 and 2004, based on the observed reduction in scallops between these 2 surveys. The reported mortality primarily occurred in a very large 2001 year class that was below commercial size in 2003−2004, whereas mortality rates were lower for larger commercial-sized scallops.

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mentioning

confidence: 99%

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Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

Hart¹,

Shank²

2011

Mar. Ecol. Prog. Ser.

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Stokesbury et al. (2011; Mar Ecol Prog Ser 425:167−173) concluded that 10 billion sea scallops Placopecten magellanicus probably died from discarding during fishing operations between surveys in 2003 and 2004, based on the observed reduction in scallops between these 2 surveys. The reported mortality primarily occurred in a very large 2001 year class that was below commercial size in 2003−2004, whereas mortality rates were lower for larger commercial-sized scallops. This pattern is not consistent with mortality from discarding, because commercial scallop dredge gear is designed to retain commercial-sized scallops, allowing a substantial proportion of undersized scallops to escape through the dredge rings. Data from at-sea observers in the MidAtlantic indicate that only 319 million scallops were discarded during this period. Non-capture (incidental) fishing mortality was also too low to account for the observed mortality. However, juvenile scallop mortality due to predation increases with their density, primarily induced by crabs Cancer spp. The observed high mortality of juvenile scallops was therefore probably a result of increased predation, rather than discarding.KEY WORDS: Scallop · Cancer spp. · Predation · Fishery discards · Density dependence · Placopecten magellanicusResale or republication not permitted without written consent of the publisher

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Section: Introductionmentioning

confidence: 81%

Section: Patterns Of Mortalitymentioning

confidence: 89%

Section: Patterns Of Mortalitymentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

Hart¹,

Shank²

2011

Mar. Ecol. Prog. Ser.

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Discard Mortality of Sea Scallops Placopecten magellanicus Following Capture and Handling in the U.S. Dredge Fishery

et al. 2022

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Discard mortality can represent a potentially significant source of uncertainty for both stock assessments and fishery management measures. While the family Pectinidae is considered to be robust to the capture and handling process, understanding species-specific discard mortality rates is critical to characterize both population dynamics and to develop regulatory measures to meet management objectives. The discard mortality rate for the U.S. dredge fishery of sea scallop Placopecten magellanicus was estimated empirically via a retention study aboard industry vessels under commercial conditions. Over 16,000 sea scallops were assessed via a composite index of scallop vitality that consisted of semiqualitative measures of both overt trauma (shell damage) and response to stimuli. Results indicate that overall sea scallop discard mortality was 21% and consistent with the values currently assumed in the stock assessment. Survival mixture models support the utility of a simple metric of physical trauma as an effective predictor of mortality. Exposure time was also identified as a positively correlated factor that was important in describing the discard mortality process. Application of experimental results highlight the need to consider some operational characteristics of the fishery to reduce potential discard mortality.

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Complex habitat boosts scallop recruitment in a fully protected marine reserve

et al. 2011

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Incidental fishing mortality may be responsible for the death of ten billion juvenile sea scallops in the mid-Atlantic

Cited by 16 publications

References 26 publications

Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

Mortality of sea scallops Placopecten magellanicus in the Mid-Atlantic Bight: Comment on Stokesbury et al. (2011)

Discard Mortality of Sea Scallops Placopecten magellanicus Following Capture and Handling in the U.S. Dredge Fishery

Complex habitat boosts scallop recruitment in a fully protected marine reserve

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