Spillover of Exploitable Fishes from a Marine Park and Its Effect on the Adjacent Fishery

McClanahan, Timothy R.; Mangi, S.

doi:10.2307/2641239

Cited by 119 publications

(169 citation statements)

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“…If this is the case, then this perceived benefit of the closure may be short-term as the resultant trap aggregation may cause local overfishing (McClanahan and Kaunda-Arara 1996;Miller and Hunte 2000). McClanahan and Mangi (2000) found that by increasing the number of traps a fisherman deployed, fishermen fishing adjacent the Mombasa Marine Park experienced a reduction in the catch per trap. If so, then the MPA management may need to regulate the number of pots inside the closed area if they need to demonstrate that the closure has both conservation and fisheries benefits.…”

Section: Discussionmentioning

confidence: 99%

“…Surveys indicate that primary stakeholders living adjacent to protected areas often disproportionately bear the costs of conservation management strategies, particularly those associated with the type of restrictions on the use of resources (Hough 1988;McClanahan and Mangi 2000). For instance, commercial fishermen who are displaced by closures arguably bear most of the costs in the short run when a protected area is established, as improvements in catch may only be realized in the distant future (Sanchirico 2002).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the Impacts of Establishing MPAs on Fishermen and Fish Merchants: The Case of Lyme Bay, UK

Mangi

Rodwell

2011

AMBIO

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Shortly after the implementation of a marine protected area (MPA) in Lyme Bay in 2008, inside which scallop dredging and bottom trawling is prohibited, a socio-economic impact assessment was initiated. This article presents the initial findings from this study. The aim was to understand the costs and benefits to fishermen and fish merchants of establishing the MPA. These were assessed using a combination of primary and secondary data. The results indicate that the impacts of the closure differ according to the gear type and the fishing location used by the fishermen. Static gear fishermen who fish inside the closed area have seen changes in terms of increased fishing effort, mostly because they have been able to increase the number of crab and whelk pots they deploy. The effects of the closure on static gear fishermen who fish outside the closed area has been reported in terms of increased conflicts with towed gear fishermen who now fish regularly in their traditional grounds. Fishermen using towed gear on the other hand have been impacted through displacement effects as they have been forced to look for other fishing grounds outside the closed area. Most fish merchants and processors initially claimed that they were heavily impacted by the closure but when they were interviewed 1 year after the closure they suggested a more stable picture. Preliminary analyses of landings data indicate that the introduction of the MPA has so far had minimal impacts on the average incomes and financial profits of fishermen and fish merchants. This conclusion, however, reflects a short-term view as the impacts of the closure of Lyme Bay are likely to be felt for a long time to come.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the Impacts of Establishing MPAs on Fishermen and Fish Merchants: The Case of Lyme Bay, UK

Mangi

Rodwell

2011

AMBIO

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“…Reserve function can be examined directly through quantifying movement into and out of reserves, as well as the animal movement response to boundary placement that often occurs along physical discontinuities. For the management of exploited species, the main aim of a refuge or a no-take reserve is that animal biomass will increase within the protected area and eventually high density forces relocation, resulting in "spillover" into surrounding waters where they are fished (Russ and Alcala, 1996;McClanahan and Mangi, 2000). For some reserves, the contribution a relocating individual makes to nearby fisheries will be a function of its mobility and resource requirements.…”

Section: Implications For Conservation and Resource Managementmentioning

confidence: 99%

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

Pittman

McAlpine

2003

Advances in Marine Biology

222

178

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“…Spillover distance estimates at the taxonomic level were nearly identical for density versus biomass for this study, so this decision had no effect on our results. For Mombasa Reserve (McClanahan & Mangi 2000), we used catch rather than mean fish size data, because mean size masks abundance and/or biomass patterns while catch is a direct measure of fisheries benefit. For Barbados Reserve (Rakitin & Kramer 1996), we used catch rather than density data as density gradients do not always reflect true spillover patterns (as discussed below), but we report both measures in Appendix 1 (see supplementary material at URL http://www.ncl.ac.uk/ icef/EC_Supplement.htm) to help illustrate this point.…”

Section: Synthesismentioning

confidence: 99%

Spillover from marine reserves and the replenishment of fished stocks

2009

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SUMMARYNo-take marine reserves are widely recognized as an effective conservation tool for protecting marine resources. Despite considerable empirical evidence that abundance and biomass of fished species increase within marine reserve boundaries, the potential for reserves to provide fisheries and conservation benefits to adjacent waters remains heavily debated. This paper uses statistical and population models to evaluate published empirical data on adult spillover from marine reserves and shows that spillover is a common phenomenon for species that respond positively to reserve protection, but at relatively small scales, detectable on average up to 800 m from reserve boundaries. At these small scales, local fisheries around reserves were likely unsustainable in 12 of 14 cases without the reserve, and spillover partially or fully offsets losses in catch due to reserve closure in the other two cases. For reserves to play a role in sustaining and replenishing larger-scale fished stocks, networks of reserves may be necessary, but as few exist this is difficult to evaluate. The results suggest reserves can simultaneously meet conservation objectives and benefit local fisheries adjacent to their boundaries.

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Spillover of Exploitable Fishes from a Marine Park and Its Effect on the Adjacent Fishery

Cited by 119 publications

References 0 publications

Assessing the Impacts of Establishing MPAs on Fishermen and Fish Merchants: The Case of Lyme Bay, UK

Assessing the Impacts of Establishing MPAs on Fishermen and Fish Merchants: The Case of Lyme Bay, UK

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

Spillover from marine reserves and the replenishment of fished stocks

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