Indo-Pacific origins of silky shark fins in major shark fin markets highlights supply chains and management bodies key for conservation,Conservation Letters

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Indo-Pacific origins of silky shark fins in major shark fin markets highlights supply chains and management bodies key for conservation
Conservation Letters ( IF 8.5 ) Pub Date : 2020-12-08 , DOI: 10.1111/conl.12780
Diego Cardeñosa _{1,

2,

3} , Andrew T. Fields ₁ , Elizabeth Babcock ₄ , Stanley K. H. Shea ₅ , Kevin A. Feldheim ₆ , Derek W. Kraft ₇ , Melanie Hutchinson _{7,

8} , Maria A. Herrera ₉ , Susana Caballero ₁₀ , Demian D. Chapman ₃

Affiliation

School of Marine and Atmospheric Science Stony Brook University New York USA
Fundación Colombia Azul Bogotá Colombia
Department of Biological Sciences Florida International University North Miami Florida USA
Rosenstiel School of Marine and Atmospheric Science, Department of Marine Biology and Ecology University of Miami Miami Florida USA
BLOOM Association, c/o ADMCF Hong Kong
Pritzker Laboratory for Molecular Systematics and Evolution The Field Museum Chicago Illinois USA
Hawai‘i Institute of Marine Biology University of Hawai‘i Kane‘ohe Hawaii USA
Joint Institute for Marine and Atmospheric Research, Pacific Islands Fisheries Science Center, NOAA University of Hawaii Honolulu Hawaii USA
Departamento de Ciencias Naturales y Matemáticas Pontificia Universidad Javeriana Cali Colombia
Laboratorio de Ecología Molecular de Vertebrados Acuáticos – LEMVA Departamento de Ciencias Biológicas Universidad de Los Andes Bogotá Colombia

The silky shark is the second most common shark in Southeast Asia's dried fin markets and is managed in the Atlantic Ocean by the International Commission for the Conservation of Atlantic Tuna (ICCAT) and by three Indo-Pacific regional fisheries management organizations (RMFOs). The International Commission for the Conservation of Atlantic Tuna reports ∼ 7% of global silky landings but there is a moratorium on the export of their fins. During a 4-year period (2014–2017) we used genetic differentiation observed between Atlantic and Indo-Pacific silky sharks to assess the contribution of Atlantic individuals to fins randomly obtained in the two largest shark fin markets in the world, Hong Kong and Guangzhou, China (N = 604). We did not detect any Atlantic fins in either market despite robust sampling effort with an estimated Indo-Pacific contribution of 99.8% to these markets. These findings indicate that supply chains for silky shark fins in Hong Kong and Guangzhou primarily originate in the Indo-Pacific and are mainly under the purview of three Regional Fisheries Management Organizations. Our results are consistent with the possibility that ICCAT parties have achieved high compliance with the ban on silky sharks. We suggest research and monitoring improvements that could enhance our understanding of the global trade of silky sharks and enable better fisheries management.

更新日期：2020-12-08

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