International shark fin markets and shark management: an integrated market preference–cohort analysis of the blacktip shark (Carcharhinus limbatus)

Fong, Quentin; Anderson, James L.

doi:10.1016/s0921-8009(01)00273-7

Cited by 37 publications

(26 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Baum and Myers (2004) assess baselines in shark populations in the Gulf of Mexico from 1950, as industrial long-line fishing in that region commenced in 1957. Given that, (1) Chagossian people who inhabited the islands until the early 1970s were copra plantation workers, rather than fishing communities, (2) coastal species of shark are not greatly affected by long-line fishing fleets (Baum and Myers, 2004), and (3) the shark fin trade really took off in the 1980s and 1990s (Fong and Anderson, 2002;Schindler et al, 2002), it seems possible that the 4.2 reef sharks observed per dive in the 1970s is a realistic baseline for Chagos. Such numbers correspond to numbers of sharks seen in some remote locations that are thought to have escaped poaching (JH Choat, personal communication).…”

Section: Discussionmentioning

confidence: 97%

“…Poor data quality and high variance make accurate stock assessments difficult (Dulvy et al, 2008). Greater efforts to monitor fisheries are necessary, with the implementation of species specific size limits, and the use of total allowable catches and individual transferable quotas (Fong and Anderson, 2002). However, as many reef shark populations are exploited in countries where fisheries enforcement and monitoring is not strong, such fisheries tools will be difficult to implement.…”

Section: Discussionmentioning

confidence: 99%

“…The decline of sharks has increased in the past two decades, linked to increases in the shark fin trade (Fong and Anderson, 2002;Schindler et al, 2002;Clarke et al, 2007), with fins selling for as much as US$700/kg (Verlecar et al, 2007). Direct targeting of sharks has become more widespread, but even when taken as bycatch, common in some longline and trawl fisheries, sharks are often more accurately considered as secondary targets rather than waste (Dulvy et al, 2008).…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Reef shark declines in remote atolls highlight the need for multi‐faceted conservation action

Graham

Spalding²,

Sheppard

2010

Aquatic Conservation

139

128

View full text Add to dashboard Cite

ABSTRACT1. The decline of large-bodied predatory species in the oceans is a concern both from a sustainability perspective and because such species can have important ecological roles. Sharks are particularly vulnerable to fishing as their life histories are characterized by late age at maturity, large body size, and low fecundity. 4. Poaching in the archipelago, is the most likely cause of these declines, highlighted by a number of illegal vessels containing large numbers of sharks arrested since 1996. The data highlight that shark populations, even in remote, otherwise pristine, marine areas, are vulnerable to distant fishing fleets, and a range of strategies will need to be used in concert for their conservation.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Reef shark declines in remote atolls highlight the need for multi‐faceted conservation action

Graham

Spalding²,

Sheppard

2010

Aquatic Conservation

139

128

View full text Add to dashboard Cite

show abstract

“…A single MSL can be applied to a set of managed species that are difficult to differentiate or when sparse biological information prevents the development of species-specific management strategies (Anonymous, 1999(Anonymous, , 2002Mapstone et al, 2004;Foster and Vincent, 2005). However, minimum size limits alone may not prevent population declines, if exploitation rates are high (Perry et al, 2002), the MSL is not effectively enforced (Foale and Day, 1997) or the managed species is captured using non-selective gears (Fong and Anderson, 2002;Scholten and Bettoli, 2005).…”

Section: Introductionmentioning

confidence: 96%

Preservation causes shrinkage in seahorses: implications for biological studies and for managing sustainable trade with minimum size limits

Nadeau

Curtis

Lourie

2008

Aquatic Conservation

View full text Add to dashboard Cite

ABSTRACT1. The implications of shrinkage associated with desiccation and ethanol preservation for seahorses (genus Hippocampus) were investigated using Hippocampus guttulatus (European long-snouted seahorse) as a model. Specifically, this research addressed the implications of preservation for taxonomy and life history studies and the application of minimum size limits (MSL) for managing seahorse trade.2. In 2004, the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) listed all seahorse species on its Appendix II, and recommended a 10 cm MSL as an interim means of ensuring sustainable international trade. Inconsistencies in seahorse measurement methods and repeatability posed challenges for applying the MSL. Moreover, the shrinking effect of desiccation on body length observed in other fish was assumed to be negligible for seahorses because of their high degree of ossification.3. Changes in seahorse sizes were measured following immersion in ethanol and desiccation. H. guttulatus shrank on average by 0.1-2.3% when preserved in ethanol and 3.0-6.4% when dried, depending on the trait measured. Similar trends were observed in a sample of H. kuda (yellow seahorse). Specimen posture during drying, and measurement methods also influenced estimates of size.4. Based on the shrinkage observed, 14-44% of captured seahorses that are dried could shrink to below the recommended MSL, even if all seahorses were longer than the MSL at capture. This demonstrates that small changes in body lengths can have significant implications for trade of species managed with size limits.5. Recommendations are to (1) standardize seahorse measurement methods, (2) consider the effects of preservation and measurement technique on body lengths, and apply appropriate corrections in comparative studies and when developing fisheries management strategies, and (3) adjust size limits at the point of capture to ensure retained seahorses comply with the CITES recommended MSL.

show abstract

“…Whereas the non-target catch of seabirds, marine mammals or sea turtles is not typically sold commercially (although there are exceptions to this; see Robards & Reeves 2011), incidentally caught elasmobranchs are commonly retained and may be an important component of commercial yield from landed catch, driven by demand from both national and international markets (Walker 1998;Fong & Anderson 2002). Thus, the line between elasmobranch target catch and non-target catch is often unclear.…”

Section: Introductionmentioning

confidence: 99%

Drivers of retention and discards of elasmobranch non-target catch

et al. 2015

View full text Add to dashboard Cite

SUMMARYTo address growing concern over the effects of fisheries non-target catch on elasmobranchs worldwide, the accurate reporting of elasmobranch catch is essential. This requires data on a combination of measures, including reported landings, retained and discarded non-target catch, and post-discard survival. Identification of the factors influencing discard versus retention is needed to improve catch estimates and to determine wasteful fishing practices. To do this, retention rates of elasmobranch non-target catch in a broad subset of fisheries throughout the world were compared by taxon, fishing country, and gear. A regression tree and random forest analysis indicated that taxon was the most important determinant of retention in this dataset, but all three factors together explained 59% of the variance. Estimates of total elasmobranch removals were calculated by dividing the Food and Agriculture Organization of the United Nations (FAO) global elasmobranch landings by average retention rates, and suggest that total elasmobranch removals may exceed FAO reported landings by as much as 400%. This analysis is the first effort to directly characterize global drivers of discards for elasmobranch non-target catch. The results highlight the importance of accurate quantification of retention and discard rates to improve assessments of the potential impacts of fisheries on these species.

show abstract

International shark fin markets and shark management: an integrated market preference–cohort analysis of the blacktip shark (Carcharhinus limbatus)

Cited by 37 publications

References 14 publications

Reef shark declines in remote atolls highlight the need for multi‐faceted conservation action

Reef shark declines in remote atolls highlight the need for multi‐faceted conservation action

Preservation causes shrinkage in seahorses: implications for biological studies and for managing sustainable trade with minimum size limits

Drivers of retention and discards of elasmobranch non-target catch

Contact Info

Product

Resources

About