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Your search keyword '"Melnychuk, Michael"' showing total 18 results
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18 results on '"Melnychuk, Michael"'

2. Quota use in mixed‐stock fisheries

Author

Karp, William A., primary, Melnychuk, Michael C., additional, Forrest, Robyn E., additional, Little, Lorne Richard, additional, McQuaw, Kristin, additional, Demarest, Chad, additional, Hilborn, Ray, additional, Baker, Nicole, additional, Mose, Brian, additional, Turris, Bruce, additional, and Lado, Ernesto Penas, additional

Published
2023
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5. Recent trends in abundance and fishing pressure of agency‐assessed small pelagic fish stocks

Author

Hilborn, Ray, primary, Buratti, Claudio C., additional, Díaz Acuña, Erich, additional, Hively, Daniel, additional, Kolding, Jeppe, additional, Kurota, Hiroyuki, additional, Baker, Nicole, additional, Mace, Pamela M., additional, de Moor, Carryn L., additional, Muko, Soyoka, additional, Osio, Giacomo Chato, additional, Parma, Ana M., additional, Quiroz, Juan‐Carlos, additional, and Melnychuk, Michael C., additional

Published
2022
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6. Geographical variation in the trait‐based assembly patterns of multitrophic invertebrate communities

Author

Srivastava, Diane S., primary, MacDonald, A. Andrew M., additional, Pillar, Valério D., additional, Kratina, Pavel, additional, Debastiani, Vanderlei J., additional, Guzman, Laura Melissa, additional, Trzcinski, Mark Kurtis, additional, Dézerald, Olivier, additional, Barberis, Ignacio M., additional, de Omena, Paula M., additional, Romero, Gustavo Q., additional, Ospina‐Bautista, Fabiola, additional, Marino, Nicholas A. C., additional, Leroy, Céline, additional, Farjalla, Vinicius F., additional, Richardson, Barbara A., additional, Gonçalves, Ana Z., additional, Corbara, Bruno, additional, Petermann, Jana S., additional, Richardson, Michael J., additional, Melnychuk, Michael C., additional, Jocqué, Merlijn, additional, Ngai, Jacqueline T., additional, Talaga, Stanislas, additional, Piccoli, Gustavo C. O., additional, Montero, Guillermo, additional, Kirby, Kathryn R., additional, Starzomski, Brian M., additional, and Céréghino, Régis, additional

Published
2022
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7. Global status of groundfish stocks

Author

Hilborn, Ray, primary, Hively, Daniel J., additional, Loke, Nicole Baker, additional, Moor, Carryn L., additional, Kurota, Hiroyuki, additional, Kathena, Johannes N., additional, Mace, Pamela M., additional, Minto, Cóilín, additional, Parma, Ana M., additional, Quiroz, Juan‐Carlos, additional, and Melnychuk, Michael C., additional

Published
2021
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9. Effects of biological, economic and management factors on tuna and billfish stock status

Author

Pons, Maite, Branch, Trevor A., Melnychuk, Michael C., Jensen, Olaf P., Brodziak, Jon, Fromentin, Jean-marc, Harley, Shelton J., Haynie, Alan C., Kell, Laurie T., Maunder, Mark N., Parma, Ana M., Restrepo, Victor R., Sharma, Rishi, Ahrens, Robert, Hilborn, Ray, Pons, Maite, Branch, Trevor A., Melnychuk, Michael C., Jensen, Olaf P., Brodziak, Jon, Fromentin, Jean-marc, Harley, Shelton J., Haynie, Alan C., Kell, Laurie T., Maunder, Mark N., Parma, Ana M., Restrepo, Victor R., Sharma, Rishi, Ahrens, Robert, and Hilborn, Ray

Abstract

Commercial tunas and billfishes (swordfish, marlins and sailfish) provide considerable catches and income in both developed and developing countries. These stocks vary in status from lightly exploited to rebuilding to severely depleted. Previous studies suggested that this variability could result from differences in life-history characteristics and economic incentives, but differences in exploitation histories and management measures also have a strong effect on current stock status. Although the status (biomass and fishing mortality rate) of major tuna and billfish stocks is well documented, the effect of these diverse factors on current stock status and the effect of management measures in rebuilding stocks have not been analysed at the global level. Here, we show that, particularly for tunas, stocks were more depleted if they had high commercial value, were long-lived species, had small pre-fishing biomass and were subject to intense fishing pressure for a long time. In addition, implementing and enforcing total allowable catches (TACs) had the strongest positive influence on rebuilding overfished tuna and billfish stocks. Other control rules such as minimum size regulations or seasonal closures were also important in reducing fishing pressure, but stocks under TAC implementations showed the fastest increase of biomass. Lessons learned from this study can be applied in managing large industrial fisheries around the world. In particular, tuna regional fisheries management organizations should consider the relative effectiveness of management measures observed in this study for rebuilding depleted large pelagic stocks.

Published
2017
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12. Effects of biological, economic and management factors on tuna and billfish stock status

Author

Pons, Maite, primary, Branch, Trevor A, additional, Melnychuk, Michael C, additional, Jensen, Olaf P, additional, Brodziak, Jon, additional, Fromentin, Jean M, additional, Harley, Shelton J, additional, Haynie, Alan C, additional, Kell, Laurie T, additional, Maunder, Mark N, additional, Parma, Ana M, additional, Restrepo, Victor R, additional, Sharma, Rishi, additional, Ahrens, Robert, additional, and Hilborn, Ray, additional

Published
2016
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13. Can catch share fisheries better track management targets?

Author

Melnychuk, Michael C., Essington, Timothy E., Branch, Trevor A., Heppell, Selina S., Jensen, Olaf P., Link, Jason S., Martell, Steven J. D., Parma, Ana María, Pope, John G., and Smith, Anthony D. M.

Subjects
FISHERY MANAGEMENT, PROPENSITY SCORE MATCHING, Otras Agricultura, Silvicultura y Pesca, OUTPUT CONTROL, INDIVIDUAL TRANSFERABLE QUOTA, CIENCIAS AGRÍCOLAS, MIXED-EFFECTS MODEL, OVERFISHING, Agricultura, Silvicultura y Pesca
Abstract

Fisheries management based on catch shares – divisions of annual fleet-wide quotas among individuals or groups – has been strongly supported for their economic benefits, but biological consequences have not been rigorously quantified. We used a global meta-analysis of 345 stocks to assess whether fisheries under catch shares were more likely to track management targets set for sustainable harvest than fisheries managed only by fleet-wide quota caps or effort controls. We examined three ratios: catch-to-quota, current exploitation rate to target exploitation rate and current biomass to target biomass. For each, we calculated the mean response, variation around the target and the frequency of undesirable outcomes with respect to these targets. Regional effects were stronger than any other explanatory variable we examined. After accounting for region, we found the effects of catch shares primarily on catch-to-quota ratios: these ratios were less variable over time than in other fisheries. Over-exploitation occurred in only 9% of stocks under catch shares compared to 13% of stocks under fleet-wide quota caps. Additionally, over-exploitation occurred in 41% of stocks under effort controls, suggesting a substantial benefit of quota caps alone. In contrast, there was no evidence for a response in the biomass of exploited populations because of either fleet-wide quota caps or individual catch shares. Thus, for many fisheries, management controls improve under catch shares in terms of reduced variation in catch around quota targets, but ecological benefits in terms of increased biomass may not be realized by catch shares alone. Fil: Melnychuk, Michael C.. University of Washington; Estados Unidos Fil: Essington, Timothy E.. University of Washington; Estados Unidos Fil: Branch, Trevor A.. University of Washington; Estados Unidos Fil: Heppell, Selina S.. Oregon State University; Estados Unidos Fil: Jensen, Olaf P.. Rutgers University; Estados Unidos Fil: Link, Jason S.. Northeast Fisheries Science Center; Estados Unidos Fil: Martell, Steven J. D.. University of British Columbia; Canadá Fil: Parma, Ana María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Pope, John G.. NRC (Europe) Ltd.; Reino Unido Fil: Smith, Anthony D. M.. Wealth From Oceans Flagship; Australia

Published
2011

16. Catch shares, fisheries, and ecological stewardship: a comparative analysis of resource responses to a rights-based policy instrument

Author

Essington, Timothy E., primary, Melnychuk, Michael C., additional, Branch, Trevor A., additional, Heppell, Selina S., additional, Jensen, Olaf P., additional, Link, Jason S., additional, Martell, Steven J. D., additional, Parma, Ana M., additional, Pope, John G., additional, and Smith, Anthony D. M., additional

Published
2012
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18. Can catch share fisheries better track management targets?

Author

Melnychuk, Michael C, primary, Essington, Timothy E, additional, Branch, Trevor A, additional, Heppell, Selina S, additional, Jensen, Olaf P, additional, Link, Jason S, additional, Martell, Steven J D, additional, Parma, Ana M, additional, Pope, John G, additional, and Smith, Anthony D M, additional

Published
2011
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