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RESEARCH ARTICLE (Open Access)
Contents Vol 31(2)

Overfished and under conserved: life-history, ecology and supply chain of the Endangered whitespotted whipray (Maculabatis gerrardi) and sharpnose whipray (Maculabatis macrura) from south-east Asia

N. Clark-Shen https://orcid.org/0000-0002-8003-6681 A B * , A. Chin https://orcid.org/0000-0003-1813-4042 C D , C. Gan B , K. Xu-Ting Ting E , C. Terence A , J. Ng Zheng Kai A , D. Wee https://orcid.org/0009-0005-3805-0622 A and N. Hutchinson F
+ Author Affiliations
- Author Affiliations

A Tropical Future Institute, James Cook University, Singapore 387380, Singapore.

B World Wide Fund for Nature (WWF), WWF-Singapore, Singapore.

C James Cook University, Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and Engineering, Douglas, Qld, Australia.

D Faculty of Marine Science and fisheries, Hasanuddin University, Makassar, South Sulawesi, Indonesia.

E The Dorsal Effect Pte Ltd, 22 Sin Ming Lane, Singapore.

F School of Science and Technology, Tropical Future Institute, James Cook University, Singapore 387380, Singapore.

* Correspondence to: naomi.clarkshen@my.jcu.edu.au

Handling Editor: Karissa Lear

Pacific Conservation Biology 31, PC24086 https://doi.org/10.1071/PC24086
Submitted: 22 November 2024  Accepted: 18 March 2025  Published: 31 March 2025

© 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)

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.

Keywords: age and growth, diet, elasmobranch, fishery, Indonesia, life-history, Singapore, stingray.

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