Global estimates of shark catches using trade records from commercial markets.

@article{Clarke2006GlobalEO,
  title={Global estimates of shark catches using trade records from commercial markets.},
  author={Shelley C. Clarke and Murdoch Mcallister and E. J. Milner‐Gulland and Geoffrey P. Kirkwood and Catherine G. J. Michielsens and David J Agnew and Ellen K. Pikitch and H. Nakano and Mahmood S. Shivji},
  journal={Ecology letters},
  year={2006},
  volume={9 10},
  pages={
          1115-26
        }
}
Despite growing concerns about overexploitation of sharks, lack of accurate, species-specific harvest data often hampers quantitative stock assessment. In such cases, trade studies can provide insights into exploitation unavailable from traditional monitoring. We applied Bayesian statistical methods to trade data in combination with genetic identification to estimate by species, the annual number of globally traded shark fins, the most commercially valuable product from a group of species often… 

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References

SHOWING 1-10 OF 47 REFERENCES
Can shark resources be harvested sustainably? A question revisited with a review of shark fisheries
TLDR
This paper reviews the use of shark products, the effects of fishing on shark populations of the world, and recent developments in assessment of shark fishery stocks.
Identification of Shark Species Composition and Proportion in the Hong Kong Shark Fin Market Based on Molecular Genetics and Trade Records
TLDR
This work designed a sampling strategy for collecting statistically sufficient numbers of fins from traders and categories under conditions of limited market access because of heightened trader sensitivities, and incorporated the concordance information and available market auction records for these categories into stochastic models to estimate the contribution of each taxon by weight to the fin trade.
Estimates of Shark Species Composition and Numbers Associated with the Shark Fin Trade Based on Hong Kong Auction Data
TLDR
It is demonstrated how the traded quantity estimates can be converted to the weight and number of sharks represented based on preliminary conversion factors from the literature and from this research.
SHIFTS IN OPEN‐OCEAN FISH COMMUNITIES COINCIDING WITH THE COMMENCEMENT OF COMMERCIAL FISHING
We identify changes in the pelagic fish community of the tropical Pacific Ocean by comparing recent data collected by observers on longline fishing vessels with data from a 1950s scientific survey
Intrinsic rebound potentials of 26 species of Pacific sharks
TLDR
A demographic technique is used to compare the intrinsic rates of population increase of 26 shark species hypothetically exposed to fishing mortality and ‘Rebound’ productivity was strongly affected by age at maturity and little affected by maximum age.
Genetic profiling reveals illegal international trade in fins of the great white shark, Carcharodon carcharias
TLDR
The presence of small fins in the trade contradicts the view that white shark fins have market value only as large display trophies, and not as food, and indicates that effective conservation of protected shark species will require international management regimes that include monitoring of the shark fishery and trade on a species-specific basis.
Understanding pressures on fishery resources through trade statistics: a pilot study of four products in the Chinese dried seafood market
This study investigates the dried seafood trade, centred in Chinese markets, in order to better understand the pressures its demand exerts on global marine resource stocks. Using Hong Kong, the
Genetic Identification of Pelagic Shark Body Parts for Conservation and Trade Monitoring
TLDR
Preliminary testing of dried fins from Asian and Mediterranean commercial markets suggests that the genetic approach will be useful for determining the species of origin of detached fins, thus allowing the monitoring of trade in shark fins for conservation assessment.
Incorporating Uncertainty into Demographic Modeling: Application to Shark Populations and Their Conservation
TLDR
Results from elasticity and correlation analyses suggest that research, conservation, and management efforts should focus on demographic traits of sharks, and correlation analysis indicates that variation in juvenile survival, age at maturity, and reproduction account for most of the variation in λ.
...
1
2
3
4
5
...