Size-Selectivity of the Northwest Atlantic Sea Scallop (Placopecten magellanicus) Dredge

Yochum, Noëlle; DuPaul, William D.

doi:10.2983/0730-8000(2008)27[265:sotnas]2.0.co;2

Cited by 22 publications

(28 citation statements)

References 10 publications

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“…Recruits were defined as any scallop with a shell height of < 75 mm (based on shell height frequencies), the scallop's sexual maturity (gonad dry weight > 0.5 g producing >10 million eggs; MacDonald & Thompson 1985, Langton et al 1987, McGarvey et al 1992, and the confounding effect of the selectivity of the fishery operating with both 89 mm (3.5') and 102 mm (4.0') rings in the dredge bag between 2003 and 2009. The dredge gear with a 102 mm ring in the 2005 and 2006 scallop fishery showed 50% retention at 100.1 mm shell height (Yochum & DuPaul 2008). Natural mass mortalities in sea scallop populations may be caused by extremes in the physical environment, such as temperature change, or biological factors, such as predation or the effects of senescence, including parasitism by shell borers and prokaryotic infection (Dickie & Medcof 1963.…”

Section: Methodsmentioning

confidence: 99%

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

Stokesbury¹,

Carey²,

Harris³

et al. 2011

Mar. Ecol. Prog. Ser.

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Section: Methodsmentioning

confidence: 99%

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

Stokesbury¹,

Carey²,

Harris³

et al. 2011

Mar. Ecol. Prog. Ser.

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“…Demersal trawl-gear selectivity studies for scallops are limited because most other scallop fisheries operate dredging gear. In the North West Atlantic sea scallop (Placopecten magellanicus) fishery, both experimental and commercial trials have shown that as the dredge ring size increases the escapement of small scallops increases as well as does increased harvest efficiency for larger scallops (DuPaul et al 1996;Rudders et al 2000;Yochum and DuPaul 2008). There have been four dredge-ring size changes in this fishery since 1994, which highlights the importance of ongoing gear modifications to improve fishing practices and resource management.…”

Section: Discussionmentioning

confidence: 99%

Performance of square-mesh codends in reducing discards and by-catch in the Shark Bay scallop fishery

Chandrapavan

Kangas

Sporer

2012

Mar. Freshwater Res.

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Abstract. The performance of square-mesh codends (as opposed to the conventional diamond mesh) was examined as a discard and by-catch reduction device for the Shark Bay saucer-scallop trawl fishery. Of the three different-sized squaremesh codends (50, 55, 60 mm) tested against the standard 100-mm diamond-mesh codend, the 50-mm square-mesh codend performed poorly with relatively high retention of small (,85 mm shell height) scallops, whereas the 55-and 60-mm square-mesh codends retained 22-33% less smaller scallops than did the diamond-mesh codend. Overall, a mean of 5% loss in commercial-sized scallops across all three square-mesh codends and significant by-catch reductions of up to 95% were achieved compared with the diamond mesh. Catch rate of prawns by the square-mesh codend was less than 2% of that of the standard prawn net. The performance of the 60-mm square-mesh codend presents a good basis for its use in commercial trials in the Shark Bay scallop trawl fishery. A move to square-mesh codends could result in a significant reduction of small scallops and by-catch and may potentially increase the catches of commercial-sized scallops as a result in improvements in water flow and net efficiency.

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“…Understanding the selective profile of fishing gear is a critical aspect of fisheries management and stock assessments. Selectivity is defined as the proportion of a population that is captured when encountered using fishing gear and provides a probabilistic framework for a fish at a given size being retained by the commercial gear (Millar 1992, Millar et al 2004, Yochum & DuPaul 2008, Cadrin et al 2016. Modifying selectivity through changes to fishing gear decreases the catch of juvenile fish, improves exploitation patterns, and can increase future yield by limiting growth overfishing while allowing fish to reach maturity (Kvamme & Frøysa 2004, Millar et al 2004, Stepputtis et al 2016.…”

Section: Introductionmentioning

confidence: 99%

“…Estimation of the selective profile of a gear can inform the development of management measure ranging from minimum landing sizes to gear regulations to minimize the catch of juveniles or undesired size classes (Revill & Holst 2004, Stepputtis et al 2016. Selectivity is also used for estimating the sources of mortality, i.e., fishing and incidental, development of length frequencies, and is used in fully integrated assessment models (Millar & Fryer 1999, Yochum & DuPaul 2008, Cadrin et al 2016. The treatment of selectivity in assessment models can vary.…”

Section: Introductionmentioning

confidence: 99%

Selectivity of Two Commercial Dredges Fished in the Northwest Atlantic Sea Scallop Fishery

Roman

Rudders

2019

Journal of Shellfish Research

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Size selectivity curves were estimated for two commercial dredge configurations used in the United States Atlantic sea scallop (Placopecten magellanicus) fishery. Traditionally, the New Bedford Style dredge (New Bedford dredge) has been used by the commercial fleet; however, since 2013, the Coonamessett Farm Turtle Deflector Dredge (turtle dredge) has been required seasonally in the Mid-Atlantic region to minimize the capture of sea turtles. This analysis provides estimates of selectivity and relative efficiency for the turtle dredge and the New Bedford dredge. Selectivity information for the turtle dredge is currently unknown, and selectivity for the New Bedford dredge was originally assessed in 2008. The Share Each LengthÕs Catch Total method was used to model scallop catch-at-length data for each commercial dredge with data collected during the Virginia Institute of Marine Science fishery-independent surveys in 2015 to 2017, conducted onboard commercial fishing vessels. The surveys were conducted in the Mid-Atlantic and Georges Bank regions of the resource in three distinct areas. A paired study design was used, where a nonselective National Marine Fisheries Service sea scallop survey dredge and either the turtle dredge or New Bedford dredge were towed simultaneously at each survey station. To assess for time-varying changes in selectivity, results were compared with the 2008 New Bedford dredge analysis. Results indicated the 50% retention length was 98.2 mm, with a selection range of 28.2 mm and a relative efficiency of 0.83 for the turtle dredge. New Bedford dredge results estimated a 50% retention length of 107.4 mm, selection range of 50.5 mm and relative efficiency of 0.81. Comparing selectivity profiles for the turtle dredge and New Bedford dredge with the 2008 results indicated a shift toward increased retention probability for smaller size classes of scallops.

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Size-Selectivity of the Northwest Atlantic Sea Scallop (Placopecten magellanicus) Dredge

Cited by 22 publications

References 10 publications

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

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

Performance of square-mesh codends in reducing discards and by-catch in the Shark Bay scallop fishery

Selectivity of Two Commercial Dredges Fished in the Northwest Atlantic Sea Scallop Fishery

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