| 英文摘要 |
Ecological risk assessment is an efficient method which can be used to evaluate the risk of fish species when its biological information is insufficient. This method is based on two parameters: productivity and susceptibility. The intrinsic population growth ratewas used to culculate the productivity. The susceptibility was calculated by the availability, encounterability, selectivity and post-capture mortality. The Silky shark had the highest ecological risk while the blue shark had the lowest. This study used an integrated risk assessment including three indices: ecological risk assessment, CITES endanger status, and the trend of body weight change to evaluate the risk of overexploitation for 8 pelagic shark species in the Atlantic Ocean. The results of cluster analysis and multi-dimensional scaling analysis indicated that the Silky shark （Carcharhinus falciformis） has the highest risk （group I）, followed by the Scalloped hammerhead （Sphyrna lewini） （group II）; while the Smooth hammerhead （S. zygaena）, Bigeye thresher shark （Alopias superciliosus）, Shortfin mako （Isurus oxyrinchus）, Oceanic whitetip shark（ C. longimanus）, Sandbar shark（ C. plumbeus） had moderate risk （group III）; the blue shark（Prionace glauca） had the least risk of overexploitation （group IV）. A rigorous management measure was recommended for the two highest risk groups; setting total allowable catch quota was proposed for the median risk group; a consistent monitoring was suggested for the least risk species. |
