Immature individuals dominate elasmobranch fisheries of the Bali Strait
Sara Tabea Winter
A G ,
+ Author Affiliations
- Author Affiliations
A College of Science and Engineering, James Cook University, Townsville, Qld 4811, Australia.
B Research Centre for Oceanography, LIPI (Indonesian Institute of Sciences), Jakarta 14430, Indonesia.
C Manta Trust, Catemwood House, Corscombe, Dorchester, Dorset, DT2 0NT, UK.
D University of the Azores, Rua Frederico Machado, 9900-862, Horta, Portugal.
E School of Biomedical Science, The University of Queensland, Saint Lucia, Qld 4072, Australia.
F Centre for Sustainable Tropical Fisheries and Aquaculture, James Cook University, Townsville, Qld 4811, Australia.
G Corresponding author. Email address: sara.winter1@my.jcu.edu.au
Marine and Freshwater Research 71(11) 1488-1500 https://doi.org/10.1071/MF19300
Submitted: 6 September 2019 Accepted: 18 February 2020 Published: 23 March 2020
Abstract
Elasmobranchs play an important role in the functioning of marine ecosystems and top-down control in food webs. However, overexploitation threatens elasmobranch populations worldwide. Indonesia is currently the leading elasmobranch fishing nation, yet elasmobranch management in Indonesia is challenging because of the paucity of data on elasmobranch fisheries, especially at a species level. This study examined the elasmobranch fisheries of the Bali Strait by describing the species, sex and size composition of the elasmobranch catch landed at a major port in Eastern Java, Indonesia. Data were collected between August 2017 and March 2018 in Muncar. Elasmobranchs were identified to species level and sexed. The disc width and length of 301 rays and the precaudal length and fork length of 1657 sharks were measured. In all, 53 species were identified, many of which are at conservation risk, including species with national and international protection. Vulnerability to fishing gear varied across sex and size of each species, with immature individuals dominating the catch of most species. The findings emphasise the need for improved management of elasmobranchs in Indonesia and could help identify priorities or form strategies. Additional regional and fisheries-specific research is recommended to develop efficient and locally adapted management strategies.
Additional keywords: Indonesia, longline fisheries, management challenges, ray, shark, small-scale fisheries.
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