Operationalizing Mud Crab (Scylla spp.) Length–Weight in a Micro-Site Data-Limited Ecotourism Fishery

Sefhanissa Puspa Retno Nizery; Aulia Lanudia Fathah; Berlania Mahardika Putri; Andik Isdianto

doi:10.48084/etasr.14067

Authors

Sefhanissa Puspa Retno Nizery Department of Marine Science, Brawijaya University, Indonesia
Aulia Lanudia Fathah Master Program of Environmental Management & Development, Brawijaya University, Indonesia https://orcid.org/0009-0005-0443-5241
Berlania Mahardika Putri Master Program of Environmental Science, Universitas Gadjah Mada, Indonesia https://orcid.org/0009-0006-9898-3085
Andik Isdianto Department of Marine Sciences, Brawijaya University, Indonesia https://orcid.org/0000-0002-4808-7868

Volume: 15 | Issue: 6 | Pages: 28725-28731 | December 2025 | https://doi.org/10.48084/etasr.14067

Received: 14 August 2025 | Revised: 3 September 2025 and 16 September 2025 | Accepted: 18 September 2025 | Online: 8 December 2025

Corresponding author: Andik Isdianto

Abstract

Urban mangrove fisheries and ecotourism need micro-site, data-limited baselines to guide low-cost gear management. This study establishes the size structure and length–weight scaling (Carapace Width–weight Relationship (CWR) and Carapace Length-weight Relationship (LWR)) of mud crabs (Scylla serrata, S. olivacea) as practical inputs for monitoring and trap guidance. Foldable traps (3 stations × 3 traps) were deployed during September and November of 2024 and 15 individuals (5 females, 10 males) were measured for Carapace Width (CW, mm) and body weight (W, g). We summarized CW distributions and fitted W = αL^b in log–log space by OLS to assess association strength and test isometry (b=3). CW spanned from 49.00 to 85.00 mm and mass from 15.81 to 102.47 g. CW–W relationships were strong, and growth was positively allometric (females, males, pooled), indicating mass increases faster than width. Results should be interpreted cautiously, given the narrow spatial scope, sampling dates, and small female sample. The findings provide a reproducible baseline for cross-estuary comparison and can be operationalized without additional analyses into an auditable workflow for ecotourism co-management, consisting of publishing a site-specific minimum-size concept, recording CW at landings, tuning entrances/mesh so smaller crabs escape, and monthly auditing using the existing indicators.

Keywords:

allometry, carapace width, size-structure, sex, mangrove ecosystem

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