Interpreting catch per unit effort data to assess the status of individual stocks and communities

Maunder, Mark N.; Sibert, John; Fonteneau, Alain; Hampton, John; Kleiber, Pierre; Harley, Shelton J.

doi:10.1016/j.icesjms.2006.05.008

Cited by 459 publications

(320 citation statements)

References 51 publications

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“…However, differences between surveys indicated that spillover did not occur consistently. This inconsistency may be related to differences in abundance (Harmelin et al 1995) or catchability (Maunder et al 2006) of the species due to seasonal variation.…”

Section: Discussionmentioning

confidence: 99%

Effects of habitat on spillover from marine protected areas to artisanal fisheries

Forcada

Valle²,

Bonhomme³

et al. 2009

Mar. Ecol. Prog. Ser.

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Marine protected areas (MPAs) potentially enhance the long-term sustainability of coastal fish resources that have been overexploited. The types and quality of habitats, both inside and outside the MPAs, may determine the likelihood of migration by fish to surrounding unprotected areas where spillover to fisheries occurs. We assessed whether MPAs enhanced catches of artisanal fisheries, using an experimental fishing study with the same fishing gear as that used by local fishers. This approach allowed us to test the hypothesis of increased catches along the borders of MPAs in comparison with those in other fishing grounds located at medium and far distances from 3 Mediterranean MPAs: Tabarca Marine Reserve, Carry-le-Rouet Marine Reserve and Cerbère-Banyuls Marine Reserve. Surveys were done over 2 homogeneous habitats (Posidonia oceanica meadow and sand), in 3 different seasons. Catches were significantly higher for some species near the borders of the MPAs when fishing on P. oceanica meadows, but not when fishing on sandy bottoms. The spillover effect appears to be limited by a lack of continuous suitable habitat through the boundaries of the MPA. Some of the species that showed a significant response to protection and concurrent higher catches near the MPA borders, such as Dentex dentex, Mullus surmuletus, Phycis phycis, Sciaena umbra and Scorpaena porcus, are target species of artisanal fisheries. Although we found that the spatial scale of the spillover-induced density gradient was localized, it was sufficient to provide local benefits to artisanal fisheries. We conclude that spillover effects are not a universal consequence of siting MPAs in temperate waters and that they are related to the distribution of habitats inside and around MPAs.

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Section: Discussionmentioning

confidence: 99%

Effects of habitat on spillover from marine protected areas to artisanal fisheries

Forcada

Valle²,

Bonhomme³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…Hilborn and Walters 1992;Punt et al 2000;Harley et al 2001;Aires-da-Silva et al 2008). The second hypothesis also relates to the fact that catchability may change over time with changing fishing practices (see Maunder et al 2006 for a review). If fishers actively avoid catching elephant fish, catchability will decrease, resulting in a hyper-depleted index of abundance (Hilborn and 1975(Hilborn and 1980(Hilborn and 1985(Hilborn and 1990(Hilborn and 1995 Walters 1992).…”

Section: Cpue Standardisationmentioning

confidence: 99%

Subjective judgement in data subsetting: implications for CPUE standardisation and stock assessment of non-target chondrichthyans

Braccini¹,

Étienne²,

Martell³

2011

Mar. Freshwater Res.

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Abstract. Standardisation of catch-per-effort (CPUE) data is an essential component for nearly all stock assessments. The first step in CPUE standardisation is to separate the comparable from the non-comparable catch and effort records and this is normally done based on subjective rules. In the present study, we used catch-and-effort data from the elephant fish (Callorhinchus milii) to illustrate the differences in CPUE when using expert judgement to define different ad hoc selection criteria used to subset these data. The data subsets were then used in the standardisation of CPUE and the stock assessment of elephant fish. The catch-and-effort subsets produced different patterns of precision and trends, each of which led to different estimates (and related uncertainty) of model parameters and management reference points. For most CPUE series, there was a very high probability that the elephant fish stock is overexploited and that overfishing is occurring. The estimates of total allowable catch (TAC) and the uncertainty around these estimates also varied considerably depending on the CPUE series used. Our study shows how sensitive TAC estimation is when there is high uncertainty in the definition of the fishing effort targeted at the species analysed.

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“…Catch composition was also assessed based on sub-sampling from the catches of fishermen at the landing sites (Campos et al 1994;Maunder et al 2006).…”

Section: Reef Fishery Assessmentmentioning

confidence: 99%

Ecological and economic assessment of two marine protected areas in the island garden city of Samal, Davao Gulf, Philippines

Naola

Plasabas

Ballesteros

et al. 2013

Galaxea, Journal of Coral Reef Studies

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The performance of two marine protected areas (MPAs) in Samal Island, Coral Garden and Aundanao MPAs were evaluated after more than 10 years of exis tence. The evaluation tools used were fishery dependent (i.e. focus group discussion) and independent (i.e. fish census, benthic assessment and crown of thorns density) samplings. All sampling was conducted at least twice for one year. In all sites, COTs densities were just above the alarming stage (~1 individual.250 m −2 ). Aundanao MPA showed a positive feedback system by supporting the spillover effect. There is high density of sexually mature fish (＜30 cm Total length and significantly higher fish biomass estimates of target species (16 mt km −2 ) inside than outside the MPA. The relatively small catch (20 mt year −1 ) from fishing adjacent to the MPA is attributed to the limited capacity of the core zone (only 3 ha) to support the fishery. It also serves as a refuge site for small pelagic fishes (i.e. ox-eye scad, Selar boops) that aggregate along the slope. In contrast, the Coral Garden MPA had very low fish biomass (4.0 mt km −2 ) and only a couple of sexually mature individuals both inside and outside the sites.Intermittent guarding which have resulted to occasional poaching in the no take area was one of the reasons.

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Interpreting catch per unit effort data to assess the status of individual stocks and communities

Cited by 459 publications

References 51 publications

Effects of habitat on spillover from marine protected areas to artisanal fisheries

Effects of habitat on spillover from marine protected areas to artisanal fisheries

Subjective judgement in data subsetting: implications for CPUE standardisation and stock assessment of non-target chondrichthyans

Ecological and economic assessment of two marine protected areas in the island garden city of Samal, Davao Gulf, Philippines

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