Misspecifying Sex‐Structured Dynamics in Stock Assessment Models

Fish and Fisheries, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

ABSTRACT Sex‐specific variation in population demography and life‐history traits (e.g., growth, natural mortality) is common many fish populations. Differences these processes by sex can dictate dynamics influence how harvesters interact with the resource. Across various fisheries management systems, stock assessment models (SAMs), which mathematically represent age and/or size structure, are widely utilised to estimate status provide sustainable harvest recommendations. However, few studies have examined implications of alternative modelling assumptions when incorporating sex‐specific SAMs. For instance, impacts simultaneously ignoring variations selectivity, mortality on SAM performance not been explored. In this study, a simulation‐estimation framework was developed for sexually dimorphic to: (1) assess consequences sexual dimorphism (i.e., mortality, selectivity) benefits using catch data inform estimation processes, (2) evaluate incorrect regarding ratio at birth, (3) develop advice parameterising observation likelihoods describe composition data. Correctly led more robust estimates advice. Conversely, SAMs yielded biased biomass Collectively, our results underscore that oversimplified about lead poor Moreover, emphasise need routine collection support development biologically realistic models.

Language: Английский

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Identifying spatiotemporal variations in four-spot megrim (Lepidorhombus boscii) fishery nurseries to enhance management and stock assessment

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: April 28, 2025

Introduction The identification of recruitment areas and other essential fish habitats exploited stocks is a fundamental requirement for the development marine spatial planning ecosystem conservation measures. Reducing mortality particularly relevant on northern continental shelf Iberian Peninsula one key prerequisites future sustainability trawl fisheries. Methods In this study, distribution nursery four-spot megrim ( Lepidorhombus boscii ) was analyzed using time series scientific bottom survey data to assess whether are persistent over time. Four environmental variables were considered as potential predictors recruit distribution, they may influence habitat selection by species: sea temperature, salinity, bathymetry, sediment type. Additionally in second stage based findings during work, abundance index within a4a stock assessment model currently used provide advice species divided into two areas. Results Spatial analyses revealed specific depth preference recruits, with higher shallower waters, 150 300 m range, respect deeper ones. More importantly, our showed significant spatial-temporal variability Furthermore, results updated differences biological reference points (BRPs) compared existing model. Discussion This suggests that static management approaches be ineffective due underscoring importance incorporating structure process. approach enables more accurate evaluations effective, sustainable management, thus laying groundwork implementation species.

Language: Английский

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Synthesizing the spatial functionality of contemporary stock assessment software to identify future needs for next generation assessment platforms

Fisheries Research, Journal Year: 2024, Volume and Issue: 275, P. 107008 - 107008

Published: April 16, 2024

Language: Английский

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Evaluating the impacts of reduced longline fishing effort on the standardization of longline catch-per-unit-effort for bigeye tuna in the eastern Pacific Ocean

Fisheries Research, Journal Year: 2024, Volume and Issue: 278, P. 107111 - 107111

Published: July 18, 2024

Language: Английский

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Expected improvements in precision when integrating opportunistic close-kin mark-recapture data into fisheries stock assessments

Fisheries Research, Journal Year: 2024, Volume and Issue: 281, P. 107222 - 107222

Published: Nov. 20, 2024

Language: Английский

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