Growth, Reproductive Parameters and Stock Status of Brown-Marbled Grouper Epinephelus fuscoguttatus, a Commonly Targeted Grouper in Saleh Bay, Indonesia

Yudi Herdiana; Peter G. Coulson; James R. Tweedley; Budy Wiryawan; Sugeng H. Wisudo; Neil R. Loneragan

doi:10.3390/fishes10120611

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Growth, Reproductive Parameters and Stock Status of Brown-Marbled Grouper Epinephelus fuscoguttatus, a Commonly Targeted Grouper in Saleh Bay, Indonesia

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Growth, Reproductive Parameters and Stock Status of Brown-Marbled Grouper Epinephelus fuscoguttatus, a Commonly Targeted Grouper in Saleh Bay, Indonesia

Yudi Herdiana, Peter G. Coulson, James R. Tweedley, Budy Wiryawan, Sugeng H. Wisudo and Neil R. Loneragan

Fishes, Vol.10(12), 611

2025

DOI: https://doi.org/10.3390/fishes10120611

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Abstract

data-limited

length at maturity

length at sex change

life history

natural mortality

spawning potential ratio

uncertainty

The brown-marbled grouper (Epinephelus fuscoguttatus), a high-value species in international trade, has experienced population declines due to intensive fishing. It is one of 12 grouper and snapper species prioritized for management in Saleh Bay, West Nusa Tenggara, Indonesia. This study analyzed catch data (2017–2022) and biological samples (2020–2021) to update key life history parameters, including natural mortality, von Bertalanffy growth parameters, asymptotic length, and size at maturity. Growth was estimated using an ELEFAN-optimized model applied to catch length–frequency data, while maturity was determined through macroscopic examination of gonads. The updated estimates (L50 = 488 mm for both sex; L95 = 568 mm for females and 616 mm for males) were incorporated into a length-based spawning potential ratio (SPR) assessment. Annual SPR values ranged from 0.13 to 0.28, substantially higher than previous estimates of 0.05–0.07, mainly due to the lower L50 used in this study. Despite this improvement, SPR values remain below the management target of 0.30 for groupers and snappers in Saleh Bay. Limited biological samples, particularly the scarcity of larger individuals and males, introduce uncertainty in the estimates. These findings emphasize the value of locally derived life history information and highlight the need for continued biological sampling to refine growth and reproductive parameters and support sustainable fisheries management.

Details

Title: Growth, Reproductive Parameters and Stock Status of Brown-Marbled Grouper Epinephelus fuscoguttatus, a Commonly Targeted Grouper in Saleh Bay, Indonesia
Authors/Creators: Yudi Herdiana - IPB University
Peter G. Coulson - Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
James R. Tweedley - Murdoch University, School of Environmental and Conservation Sciences
Budy Wiryawan - IPB University
Sugeng H. Wisudo - IPB University
Neil R. Loneragan - Murdoch University, Centre for Sustainable Aquatic Ecosystems
Publication Details: Fishes, Vol.10(12), 611
Publisher: MDPI
Grant note: KfW Entwicklungsbank (501100020024) Murdoch University (501100001799) School of Engineering and Information Technology, Murdoch University (501100015005) Wildlife Conservation Society (100005997)
Identifiers: 991005845957807891
Murdoch Affiliation: School of Environmental and Conservation Sciences; Centre for Sustainable Aquatic Ecosystems
Language: English
Resource Type: Journal article

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