Bycatch quotas in the Gulf of Mexico shrimp trawl fishery: can they work?

Diamond, Sandra L.

doi:10.1007/s11160-004-7121-0

Cited by 46 publications

(41 citation statements)

References 33 publications

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“…Third, the interplay among competing users in the GOM (20) should be considered in evaluating collapses, e.g., commercial and recreational fishers as well as a trawl fishery for penaeid shrimp that captures many juveniles as bycatch (23). In addition, the Gulf States Marine Fisheries Commission (www.gsmfc.org/) has encouraged member states to designate several species that once were fished commercially as game fish.…”

mentioning

confidence: 99%

Reanalyses of Gulf of Mexico fisheries data: Landings can be misleading in assessments of fisheries and fisheries ecosystems

Mutsert

Cowan

Essington

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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We used two high profile articles as cases to demonstrate that use of fishery landings data can lead to faulty interpretations about the condition of fishery ecosystems. One case uses the mean trophic level index and its changes, and the other uses estimates of fishery collapses. In earlier analyses by other authors, marine ecosystems in the Gulf of Mexico (GOM) and U.S. Atlantic Ocean south of Chesapeake Bay were deemed to be severely overfished and the food webs badly deteriorated using these criteria. In our reanalyses, the low mean trophic level index for the GOM actually resulted from large catches of two groups of low trophic level species, menhaden and shrimp, and the mean trophic level was slowly increasing rather than decreasing. Commercial targeting and high landings of shrimps and menhaden, especially in the GOM, drove the index as previously calculated. Reanalyses of fishery collapses incorporating criteria that included targeting, variability in fishing effort, and market forces discovered many false cases of collapse based simply upon a decline of catches to 10% of previous maximum levels. Consequently, we suggest that the low mean trophic level index calculated in the earlier article for the GOM did not reflect the overall condition of the fishery ecosystem, and that the 10% rule for collapse should not be interpreted out of context in the GOM or elsewhere. In both cases, problems lay in the assumption that commercial landings data alone adequately reflect the fish populations and communities. landings data ͉ mean trophic level index

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confidence: 99%

Reanalyses of Gulf of Mexico fisheries data: Landings can be misleading in assessments of fisheries and fisheries ecosystems

Mutsert

Cowan

Essington

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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“…Their distribution patterns, ecological roles, and status in bottom fisheries, with an emphasis on their relation with penaeid shrimps, are outlined in the "Appendix". These fish species were chosen because they ranked high in catches in the surveys as well as bycatch in the shrimp fishery (Diamond 2004). Both the junevile and adult individuals are well represented in the data (Monk et al 2015).…”

Section: Datamentioning

confidence: 99%

Finding regulation among seemingly unregulated populations: a practical framework for analyzing multivariate population time series for their interactions

2015

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The structure of ecological communities is often thought to be strongly influenced by population interactions. The interactions are often labeled as bottom-up and top-down control. Previous approaches to identify these processes often assume each population in the community is itself regulated. Therefore, each time series follows a stationary process. However, complex community structure and a lack of regulation in an individual population can result in inappropriate inferences based on traditional statistical approaches. Here, we introduce a statistical framework to analyze potentially non-stationary time series that are collectively regulated. We demonstrate the method with catch-per-unit-effort time series data of selected populations in the Gulf of Mexico. In the Gulf, we found that most of the time series data, which span 26 years, were non-stationary, thus individually unregulated. Species interaction patterns were location-dependent, but where brown shrimp interacted significantly with other species, we identified significant bottom-up forcing. On the other hand, we find almost no evidence of top-down forcing throughout the study areas.Handling Editor: Pierre Dutilleul. Electronic supplementary materialThe online version of this article (

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“…With the exception of A. lineatus and L. parva, the remaining four species mentioned above are commercially important (Vega-Cendejas and Hernández, 2004). Thus, the selective removal of juvenile fish can increase the risks of recruitment overfishing, which could lead to the depletion of commercially important fish stocks exploited at open seas (Diamond, 2004;Vianna and Almeida, 2005) or cascading higher order effects at the community or ecosystem levels (Lewison et al, 2004). Taking into account that the MS13 codend retained a greater number of fish species and had a significantly greater effect on diversity and evenness (see Figs.…”

Section: Spatio-temporal Variability Of the Ichthyofauna: Effects Of mentioning

confidence: 99%

“…Poorly selective fishing practices impact negatively the productivity of fishing grounds (Hall, 1996;FAO, 2001), affecting directly the discarded species and also modifying the trophic webs and habitats (Harrington et al, 2005). Many studies have been directed to evaluate discards in industrial fisheries worldwide (Polet, 2000;Campos et al, 2002;Halliday, 2002;Madsen and Holst, 2002;Broadhurst et al, 2004;Diamond, 2004). However, discarding from artisanal fisheries is poorly known (for exceptions see Kelleher, 2005;Ambrose et al, 2005;Vianna and D'Incao, 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessing patterns of ichthyofauna discarded by an artisanal shrimp fishery through selectivity experiments in a coastal lagoon

et al. 2009

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Bycatch quotas in the Gulf of Mexico shrimp trawl fishery: can they work?

Cited by 46 publications

References 33 publications

Reanalyses of Gulf of Mexico fisheries data: Landings can be misleading in assessments of fisheries and fisheries ecosystems

Reanalyses of Gulf of Mexico fisheries data: Landings can be misleading in assessments of fisheries and fisheries ecosystems

Finding regulation among seemingly unregulated populations: a practical framework for analyzing multivariate population time series for their interactions

Assessing patterns of ichthyofauna discarded by an artisanal shrimp fishery through selectivity experiments in a coastal lagoon

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