A novel size-based method for assessing the spawning potential ratio of data-poor octopus fisheries

Jeremy D. Prince; Indah Rufiati; Wahyu Dita Septiani; Duranta Diandria Kembaren; Charlotte Louise Anne Gough

doi:10.3389/fmars.2025.1647742

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A novel size-based method for assessing the spawning potential ratio of data-poor octopus fisheries

Journal article

Open access

Peer reviewed

A novel size-based method for assessing the spawning potential ratio of data-poor octopus fisheries

Jeremy D. Prince, Indah Rufiati, Wahyu Dita Septiani, Duranta Diandria Kembaren and Charlotte Louise Anne Gough

Frontiers in Marine Science, Vol.12, 1647742

2025

DOI: https://doi.org/10.3389/fmars.2025.1647742

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Abstract

Octopus cyanea

spawning potential ratio

data-poor assessment

octopus fisheries

short-lived assessment model

Cephalopod biology, which is characaterised by short lifespans, semelparous reproduction, rapid non-asymptotic growth, and seasonally fluctuating biomass, presents a particular challenge stock assessment. Small scale, data-poor artisanal octopus fisheries are an increasingly important source of food and income for coastal fishing communities but pose a particularly pernicious assessment challenge. We developed and tested a novel size-based data-poor assessment methodology, demonstrating its applicability with 17 Indonesian fisheries for Octopus cyanea . The Short-Lived Assessment Model (SLAM) is similar to Length-based Spawning Potential Ratio Assessment (LBSPR) and Length-based Integrated Mixed Effects (LIME) methodologies, in assuming that taxa share both growth curves and a relativity between maximum size and size of maturity. Incorporating a power curve form of growth typical of cephalopods and monthly time steps SLAM estimates selectivity at age schedules, monthly fishing mortality rates (F) and spawning potential ratio (SPR). A minimum of 12 monthly samples of catch at weight data (CAW) are required, but longer time series and additional indices of effort and/or catch will produce more reliable results. SLAM’s structure is flexible; with <24 months of CAW it parallels LBSPR in assuming equilibrium dynamics and constant monthly recruitment. With >24 months of CAW, a dynamic structure becomes possible similar to LIME, and seasonal recruitment patterns can be estimated.

Details

Title: A novel size-based method for assessing the spawning potential ratio of data-poor octopus fisheries
Authors/Creators: Jeremy D. Prince - Murdoch University
Indah Rufiati
Wahyu Dita Septiani
Duranta Diandria Kembaren
Charlotte Louise Anne Gough
Publication Details: Frontiers in Marine Science, Vol.12, 1647742
Publisher: Frontiers Media S.A.
Number of pages: 13
Identifiers: 991005831949807891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.2 Marine Biology; 3.2.2084 Cephalopod Ecology
Web Of Science research areas: Environmental Sciences; Marine & Freshwater Biology
ESI research areas: Plant & Animal Science