TY - JOUR
T1 - Determining Discard Mortality of Monkfish in a Sea Scallop Dredge Fishery
AU - Weissman, Amelia
AU - Knotek, Ryan
AU - Mandelman, John
AU - Rudders, David
AU - Roman, Sally
AU - Sulikowski, James
N1 - Funding Information:
The authors extend their gratitude to all the undergraduate, graduate, and postgraduate students at the University of New England who aided in the fieldwork of this study. We would also like to thank the captains and crews of Eastern Fisheries who assisted in the collection of specimens for study aboard the F/V and F/V . This study was approved under the Institutional Animal Care and Use Committee Protocol 033117‐002. Funding for this research was provided by NOAA 2017 Sea Scallop Research Set‐Aside Program Grant No. NA17NMF4540040. There is no conflict of interest declared in this article. Friendship Reliance
Funding Information:
The authors extend their gratitude to all the undergraduate, graduate, and postgraduate students at the University of New England who aided in the fieldwork of this study. We would also like to thank the captains and crews of Eastern Fisheries who assisted in the collection of specimens for study aboard the F/V Friendship and F/V Reliance. This study was approved under the Institutional Animal Care and Use Committee Protocol 033117-002. Funding for this research was provided by NOAA 2017 Sea Scallop Research Set-Aside Program Grant No. NA17NMF4540040. There is no conflict of interest declared in this article.
Publisher Copyright:
© 2021 American Fisheries Society
PY - 2021/6
Y1 - 2021/6
N2 - Discard mortality studies are considered a primary research priority, particularly for species and fisheries where discard rates are high. Monkfish (the commercial name for Goosefish) Lophius americanus supports the most lucrative finfish fishery in New England, and it is also the second highest bycatch species by weight in the sea scallop dredge fishery. Despite its commercial importance, no data exist with respect to monkfish discard mortality estimates for any gear type. The goals of this study were to evaluate the discard mortality process for monkfish captured in sea scallop dredge gear, estimate mortality rate, and develop best handling/management practices to mitigate the impact of monkfish bycatch in the sea scallop dredge fishery. Discard mortality was estimated during a field study conducted between June and October 2017 on board sea scallop commercial fishing vessels on Georges Bank in the Northwest Atlantic. Pop-up satellite tags were affixed to 60 monkfish to track survival from 14 to 28 d postcapture. From these monitored individuals, high predation rates were observed (n = 18 out of 26 mortalities), and the bulk of mortalities (n = 21) occurred within the first 24 h of discarding. However, in light of having no clear method for disentangling capture-related and tag-induced predation, predation was noted exclusively as one or the other to account for uncertainty and provide an upper and lower bound of mortality. This approach suggested that the discard mortality rate was between 17.9% and 54.1% for monkfish discarded by scallop dredges and that elevated air temperatures (above thermal preferences) may contribute to increased mortality. Based on these results, it appears that monkfish discard mortality is lower than previous assumptions of 100%, and potential best-practice management suggestions moving forward may include minimizing fishing in areas of high monkfish abundance or scheduling rotating time/area closures during periods when air temperature exceeds monkfish thermal tolerance of 13°C.
AB - Discard mortality studies are considered a primary research priority, particularly for species and fisheries where discard rates are high. Monkfish (the commercial name for Goosefish) Lophius americanus supports the most lucrative finfish fishery in New England, and it is also the second highest bycatch species by weight in the sea scallop dredge fishery. Despite its commercial importance, no data exist with respect to monkfish discard mortality estimates for any gear type. The goals of this study were to evaluate the discard mortality process for monkfish captured in sea scallop dredge gear, estimate mortality rate, and develop best handling/management practices to mitigate the impact of monkfish bycatch in the sea scallop dredge fishery. Discard mortality was estimated during a field study conducted between June and October 2017 on board sea scallop commercial fishing vessels on Georges Bank in the Northwest Atlantic. Pop-up satellite tags were affixed to 60 monkfish to track survival from 14 to 28 d postcapture. From these monitored individuals, high predation rates were observed (n = 18 out of 26 mortalities), and the bulk of mortalities (n = 21) occurred within the first 24 h of discarding. However, in light of having no clear method for disentangling capture-related and tag-induced predation, predation was noted exclusively as one or the other to account for uncertainty and provide an upper and lower bound of mortality. This approach suggested that the discard mortality rate was between 17.9% and 54.1% for monkfish discarded by scallop dredges and that elevated air temperatures (above thermal preferences) may contribute to increased mortality. Based on these results, it appears that monkfish discard mortality is lower than previous assumptions of 100%, and potential best-practice management suggestions moving forward may include minimizing fishing in areas of high monkfish abundance or scheduling rotating time/area closures during periods when air temperature exceeds monkfish thermal tolerance of 13°C.
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U2 - 10.1002/nafm.10603
DO - 10.1002/nafm.10603
M3 - Article
AN - SCOPUS:85105240337
SN - 0275-5947
VL - 41
SP - 856
EP - 870
JO - North American Journal of Fisheries Management
JF - North American Journal of Fisheries Management
IS - 3
ER -