‘Drivin' with your eyes closed’: Results from an international, blinded simulation experiment to evaluate spatial stock assessments

Fish and Fisheries, Journal Year: 2024, Volume and Issue: 25(3), P. 471 - 490

Published: March 1, 2024

Abstract Spatial models enable understanding potential redistribution of marine resources associated with ecosystem drivers and climate change. Stock assessment platforms can incorporate spatial processes, but have not been widely implemented or simulation tested. To address this research gap, an international experiment was organized. The study design blinded to replicate uncertainty similar a real‐world stock process, data‐conditioned, high‐resolution operating model (OM) used emulate the dynamics data for Indian Ocean yellowfin tuna ( Thunnus albacares ). Six analyst groups developed both single‐region using platform their choice, then applied each simulated data. Results indicated that across all structures platforms, assessments were able adequately recreate population trends from OM. Additionally, estimate regional generally reflected true OM, particularly regions higher biomass fishing pressure. However, consistent scaling pattern emerged, where estimated scale than within given platform. Balancing parsimony complexity trade‐offs difficult, adequate in parametrizations (e.g., allowing time‐ age‐variation movement appropriate tag mixing periods) critical performance. We recommend expanded use OMs studies, ability portray realistic performance models. Moreover, increased support experiments is warranted facilitate dissemination methodology organizations.

Language: Английский

Movement traits important to conservation and fisheries management: an example with red snapper

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Feb. 7, 2025

Abstract Site fidelity, space use, and dispersal are commonly estimated with acoustic telemetry (AT) to help inform management conservation. These behaviors can change age, habitat environmental conditions our ability accurately estimate them is affected by a study’s inference power (design components that affect how detection data represents species’ movements). Red snapper ( Lutjanus campechanus ) have been extensively studied AT over range of time periods regions, although primarily at artificial reefs (AR). Here, we use large (> 12 km 2 positioning arrays monitor study area low-relief hard bottom, reef ledge, an AR. Annual fidelity the was be 54%, but estimates were fate uncertainty model choice. Emigration increased storms in early summer. Abundance greatest small patches did not scale patch size. Although uncommon, long-distance movements connectivity between habitats occurred, maximum 206 km. Previous red studies varied greatly array size, duration, number fish tracked, impacting power. This made it difficult compare results highlights need for greater standardization methods.

Language: Английский

Stock assessment good practices: The crescendo of CAPAM’s workshop series and their consequent special issues

Fisheries Research, Journal Year: 2024, Volume and Issue: unknown, P. 107211 - 107211

Published: Nov. 1, 2024

Language: Английский