Estimates of Shark Species Composition and Numbers Associated with the Shark Fin Trade Based on Hong Kong Auction Data

Clarke, Shelley; McAllister, Murdoch K.; Michielsens, Catherine

doi:10.2960/j.v35.m488

Cited by 28 publications

(43 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2006a, b). Hong Kong is considered the centre of world trade in shark fins, controlling an estimated 50–85% of the total market (Clarke et al . 2004).…”

Section: Modelling the Marketmentioning

confidence: 99%

“…dorsal, pectoral, caudal). Clarke et al . (2004) obtained a sample of the Hong Kong trade records for the period October 1999 to March 2001, and used a Bayesian imputation procedure to estimate the total volume of trade, including the auctioned weights of fins by trade name.…”

Section: Modelling the Marketmentioning

confidence: 99%

“…Surveys of large commercial markets can be an effective means of estimating true levels of exploitation or ‘takes’ where the sources of supply are diffuse, such as for many fisheries, or when reliable records of trade are lacking (e.g. Clarke et al . 2004).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A truer measure of the market: the molecular ecology of fisheries and wildlife trade

Baker

2008

Molecular Ecology

View full text Add to dashboard Cite

Wildlife and fisheries markets are end-points in the supply chain of both legitimate and illegitimate or unregulated trade in species and natural products. Molecular ecology provides powerful tools for surveillance and estimation of this trade. Here, I review the application of these tools to market surveys and species in trade, including species identification and molecular taxonomy, population assignment and 'mixed-stock' analysis, genetic tracking and capture-recapture by individual identification. I consider the analogy of markets to natural populations and also the unique features that require novel analytical approaches and sampling design. In the most developed of these applications, the molecular ecology of market surveys and confiscated trade shipments has provided independent estimates of illegal, unregulated or unreported exploitation for sharks, elephants and whales. Although each study has taken advantage of information from trade records or official government reports concerning the ostensible levels of exploitation, it is telling that the truer measure of exploitation seems to arise from the market end-point of the supply chain.

show abstract

“…2006a, b). Hong Kong is considered the centre of world trade in shark fins, controlling an estimated 50–85% of the total market (Clarke et al . 2004).…”

Section: Modelling the Marketmentioning

confidence: 99%

Section: Modelling the Marketmentioning

confidence: 99%

See 1 more Smart Citation

A truer measure of the market: the molecular ecology of fisheries and wildlife trade

Baker

2008

Molecular Ecology

View full text Add to dashboard Cite

show abstract

“…Where national governments require reporting of bycatch or directed hunting, market surveys can validate official records and, where misreporting is detected, help point to sources of illegal, unregulated and unreported (IUU) exploitation (Baker et al, 2000a. Similarly, unofficial trading records, such as those kept by Hong Kong shark-fin traders (Clarke, McAllister & Michielsens, 2004), could provide a quantitative basis for estimation of IUU exploitation or bycatch in some fisheries.…”

Section: Introductionmentioning

confidence: 98%

Incomplete reporting of whale, dolphin and porpoise ‘bycatch’ revealed by molecular monitoring of Korean markets

Baker

Lukoschek

Lavery

et al. 2006

Animal Conservation

View full text Add to dashboard Cite

We report the results of molecular monitoring of 'whalemeat' markets in the Republic of (South) Korea based on nine systematic surveys from February 2003 to February 2005. As Korea has no programme of commercial or scientific whaling and there is a closure on the hunting of dolphins and porpoises, the only legal source of these products was assumed to be incidental fisheries mortalities ('bycatch') as reported by the government to the International Whaling Commission. Species identification of 357 products using mitochondrial DNA control region or cytochrome b sequences and the web-based programme DNA-surveillance revealed three species of baleen whales (North Pacific minke, common form Bryde's and humpback), three species of beaked whales (Cuvier's, Stejneger's and Blainville's), seven species of dolphins (short-finned pilot, false killer and killer whales; Risso's, bottlenose, common and Pacific white-sided dolphins) and two species of porpoises (harbour and finless). Comparison of market products with official records revealed a number of discrepancies. Of the eight species identified on the markets in 2003, three were not reported in official records for that year. Of the 11 species identified in 2004, five were not reported as bycatch, although one species, a humpback whale, was reported as 'stranded'. We also found significant inconsistencies in the expected frequencies of products from most species, including a large over-representation of finless porpoises and false killer whales. We suggest ways in which market surveys could be improved to provide better information on the magnitude of fisheries bycatch and other illegal, unregulated and unreported (IUU) exploitation of wildlife.

show abstract

“…2004), especially when combined with genetic identification of products (Baker et al . 2000; Clarke et al . 2004).…”

Section: Introductionmentioning

confidence: 99%

Estimating the number of whales entering trade using DNA profiling and capture‐recapture analysis of market products

et al. 2007

View full text Add to dashboard Cite

Surveys of commercial markets combined with molecular taxonomy (i.e. molecular monitoring) provide a means to detect products from illegal, unregulated and/or unreported (IUU) exploitation, including the sale of fisheries bycatch and wild meat (bushmeat). Capture-recapture analyses of market products using DNA profiling have the potential to estimate the total number of individuals entering the market. However, these analyses are not directly analogous to those of living individuals because a 'market individual' does not die suddenly but, instead, remains available for a time in decreasing quantities, rather like the exponential decay of a radioactive isotope. Here we use mitochondrial DNA (mtDNA) sequences and microsatellite genotypes to individually identify products from North Pacific minke whales (Balaenoptera acutorostrata ssp.) purchased in 12 surveys of markets in the Republic of (South) Korea from 1999 to 2003. By applying a novel capture-recapture model with a decay rate parameter to the 205 unique DNA profiles found among 289 products, we estimated that the total number of whales entering trade across the five-year survey period was 827 (SE, 164; CV, 0.20) and that the average 'half-life' of products from an individual whale on the market was 1.82 months (SE, 0.24; CV, 0.13). Our estimate of whales in trade (reflecting the true numbers killed) was significantly greater than the officially reported bycatch of 458 whales for this period. This unregulated exploitation has serious implications for the survival of this genetically distinct coastal population. Although our capture-recapture model was developed for specific application to the Korean whale-meat markets, the exponential decay function could be modified to improve the estimates of trade in other wildmeat or fisheries markets or abundance of living populations by noninvasive genotyping.

show abstract

Estimates of Shark Species Composition and Numbers Associated with the Shark Fin Trade Based on Hong Kong Auction Data

Cited by 28 publications

References 7 publications

A truer measure of the market: the molecular ecology of fisheries and wildlife trade

A truer measure of the market: the molecular ecology of fisheries and wildlife trade

Incomplete reporting of whale, dolphin and porpoise ‘bycatch’ revealed by molecular monitoring of Korean markets

Estimating the number of whales entering trade using DNA profiling and capture‐recapture analysis of market products

Contact Info

Product

Resources

About