Estimates of biomass, sustainable yield, and harvest: neither necessary nor sufficient for the management of non-commercial urban intertidal shellfish fisheries

Hartill, Bruce; Cryer, Martin; Morrison, Mark A.

doi:10.1016/j.fishres.2004.08.032

Cited by 32 publications

(34 citation statements)

References 25 publications

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“…The enormous variability in the clam population abundance, the lack of concern and assessment about harvesting numbers, and underestimates of clam consumption due to lack of commercial sales in small-scale fisheries have led to a dearth of management efforts and of integration between policy makers and resource users (Murray-Jones and Steffe 2000; Castilla and Defeo 2001;Hartill et al 2005;Wiber et al 2010;Aburto and Stotz 2013). Lack of information and control measures may lead to dramatic consequences for the clam stocks, intertidal benthic community, organisms that depend on clams as a food source, and even social, economic, and cultural aspects of local and traditional communities.…”

Section: Management Considerationsmentioning

confidence: 99%

“…On the other hand, in contrast to the significant number of studies on most temperate sandy-beach bivalves, there is a lack of information on clam-harvesting issues, including the social aspects of clammers, for most clam species worldwide and this is even more pronounced for smallsized tropical species (Narchi 1976;Schaeffer-Novelli 1980;Viegas 1981;Paes 1989;Lima et al 2000;Laudien et al 2003;Hartill et al 2005;Herrmann et al 2009;Abrahão et al 2010). This situation is often an important factor preventing the establishment of appropriate management strategies to allow sustainable use of these resources.…”

mentioning

confidence: 99%

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Population Structure, Growth, and Production of the Wedge ClamDonax hanleyanus(Bivalvia: Donacidae) from Northern Argentinean Beaches

Herrmann

Carstensen

Fischer

et al. 2009

Journal of Shellfish Research

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Section: Management Considerationsmentioning

confidence: 99%

mentioning

confidence: 99%

Population Structure, Growth, and Production of the Wedge ClamDonax hanleyanus(Bivalvia: Donacidae) from Northern Argentinean Beaches

Herrmann

Carstensen

Fischer

et al. 2009

Journal of Shellfish Research

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“…Management strategies based on inaccurate or incomplete knowledge are often unsuitable because they can lead either to overfishing and thus fishery collapse, or they can result in overly‐conservative catch restrictions that reduce economic potential (Smith 1993). This issue is a particular problem in low value or developing fisheries where limited information prevents development of the most appropriate harvest strategies (Hartill et al. 2005).…”

Section: Introductionmentioning

confidence: 99%

Optimising harvest strategies in a multi‐species bivalve fishery

Gorman¹,

Mayfield²,

Ward³

et al. 2011

Fisheries Management Eco

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Optimising harvests from fishery resources requires appropriate data. In this study, fishery-independent survey and size-at-first maturity (L 50 ) data were used to assess the suitability of current minimum legal sizes (MLS) and total allowable commercial catches (TACC) in the South Australian, mixed-species, mud-cockle (Katelysia spp.) fishery. Estimates of L 50 suggested the MLS was conservative in one fishing zone (Coffin Bay), but appropriate elsewhere. Harvestable-biomass estimates (HB) demonstrated that TACCs were excessive in the Port River (41% of HB), suitable in Coffin Bay (10% of HB) and precautionary in the West Coast (1.5% of HB) fishing zones. Consequently, the MLS was decreased by 5 mm shell length in Coffin Bay and the TACCs for the Port River (reduced by 80%) and West Coast (increased by 40%) amended. This study demonstrated that harvest strategies in mixed-species fisheries can be optimised by explicitly considering data on species composition, abundance and population biology.

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“…While this kind of monitoring aimed at understanding system dynamics is standard in commercial fisheries, where catch and effort data, and fishery-independent surveys form the basis for stock assessments, this level of data collection is unlikely to be feasible for these localised, low value, non-commercial fisheries (Hartill, Morrison, and Cryer, 2005). Furthermore, given the difficulty of collecting adequate data on recreational and customary fishing levels, a more complete and mechanistic understanding of population dynamics will likely remain elusive for these bivalve populations.…”

Section: Discussionmentioning

confidence: 99%

“…Owing to the limited knowledge of factors determining local population dynamics, these fishing regulations are largely an intuitive, and possibly inadequate management tool (Hartill, Morrison, and Cryer, 2005). For example, when significant habitat degradation (i.e., erosion and changes in sediment properties) causes the decline or disappearance of bivalve populations (e.g., as implicated at Waikawau Beach, Coromandel Peninsula; Berkenbusch and Neubauer, 2015), fisheries closures would be ineffective in reversing the population declines.…”

Section: Introductionmentioning

confidence: 99%

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Supplemental Information 2: Appendix B: Hauraki Gulf Forum Monitoring Programme Details

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Population monitoring programmes are used to gain knowledge about system functioning or about the response of a system's state to management measures. The current study provided an assessment of comprehensive monitoring data of intertidal bivalve populations in northern New Zealand. In this region, a number of bivalve species are targeted in recreational and customary fisheries, including cockles (Austrovenus stutchburyi) that are one of the main target species. To monitor the sustainability of cockle populations, regular population surveys have been conducted since the 1990s at different northern New Zealand sites, although the sampling frequency has varied greatly across sites. Furthermore, a general lack of fishing data for the target populations prevents a systematic assessment of management measures and population trends within a fishery assessment framework. In view of these shortcomings, the current study provided a systematic phenomenological assessment of the survey data to make general recommendations about the effectiveness of management and for guiding prioritisation and design for future surveys. The assessment was based on a Bayesian state-space model that simultaneously analysed monitoring data from 21 incomplete survey time-series between 1999-2000 and 2014-15. The model showed that the predictability of estimated large-size cockle densities was highly site-specific. Across all sites, the predictability of density trends could be used to guide the prioritisation of sites to be included in the survey, or to adjust the sampling frequency at individual sites. Based on the current analysis, existing management measures in the form of fishery closures at some of the sites appear to be effective in allowing recovery of depleted cockle populations. Only those sites that had management measures in place showed an increase in large cockle densities. In the absence of fishing data, adaptive management and targeted intervention could be used to further assess the efficacy of management measures.

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Estimates of biomass, sustainable yield, and harvest: neither necessary nor sufficient for the management of non-commercial urban intertidal shellfish fisheries

Cited by 32 publications

References 25 publications

Population Structure, Growth, and Production of the Wedge ClamDonax hanleyanus(Bivalvia: Donacidae) from Northern Argentinean Beaches

Population Structure, Growth, and Production of the Wedge ClamDonax hanleyanus(Bivalvia: Donacidae) from Northern Argentinean Beaches

Optimising harvest strategies in a multi‐species bivalve fishery

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