Clark-Shen, N., Chin, A., Gan, C., Ting, K. Xu-Ting, Terence, C., Kai, J. Ng Zheng, Wee, D., and Hutchinson, N. (2025) Overfished and under conserved: life-history, ecology and supply chain of the Endangered whitespotted whipray (Maculabatis gerrardi) and sharpnose whipray (Maculabatis macrura) from Southeast Asia. Pacific Conservation Biology, 31. PC24086.

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Abstract

Context The whitespotted whipray (Maculabatis gerrardi) and sharpnose whipray (Maculabatis macrura) are caught and traded in large volumes in south-east Asia and listed as Endangered by the IUCN.

Aims This study aimed to provide insights to their biology, ecology, fisheries, and markets.

Methods A total of 95 specimens from the species complex (M. gerrardi = 45, M. macrura = 40, and undetermined = 10) caught from Indonesia and Malaysia were examined, and an interview with a Singaporean seafood supplier was conducted.

Key results For M. gerrardi, the youngest mature male was 4 years old with 50% reaching maturity at 5.07 years, and the youngest mature female was 4 years old with 50% reaching maturity at 6.96 years. For M. macrura, the youngest mature male was 4 years old with 50% reaching maturity at 6.36 years, and the youngest mature female was 6 years old with 50% reaching maturity at 6.00 years, but with low sample size. The oldest specimen in the sample was 15 years old. Maculabatis spp. show asynchronous breeding with a littler size of one to five. There was no significant difference in the diets of both species, with Decapoda the dominant prey. The seafood supplier revealed that Maculabatis spp. are targeted by fisheries, and he perceives large declines in their population since he started in the business.

Conclusions and implications Considering the challenges distinguishing between the two cryptic species, life-history parameters that capture this species-complex as whole may be a more practical approach to management and are presented.

Item ID:	85036
Item Type:	Article (Research - C1)
ISSN:	2204-4604
Copyright Information:	© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Date Deposited:	01 Apr 2025 22:58
FoR Codes:	31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 50% 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 50%
SEO Codes:	10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1003 Fisheries - wild caught > 100399 Fisheries - wild caught not elsewhere classified @ 50% 18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180501 Assessment and management of benthic marine ecosystems @ 50%
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