Evaluation of Fishing Opportunities under Sea Turtle Interaction Limits —A Decision Support Model for Hawaii-based Longline Swordfish, Xiphias gladius, Fishery Management

Pan, Minling; Li, Shichao

doi:10.7755/mfr.77.3.3

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Bycatch is the unintended catch of non-target species, and remains one of the greatest threats to sustainable fisheries worldwide (Lewison et al, 2014). Bycatch in fisheries for highly migratory species can result in huge economic loss, for example exceeding prescribed bycatch thresholds can result in the closure of entire fisheries (Pan & Li, 2015). Reducing bycatch is often a multi-pronged effort, focusing on changes to fishing gear and fishing practices, and implementation of spatial closures when more action is needed (Hall, Alverson, & Metuzals, 2000;O'Keefe, Cadrin, & Stokesbury, 2014).…”

Section: Introductionmentioning

confidence: 99%

Lost opportunity: Quantifying the dynamic economic impact of time‐area fishery closures

Smith

Tommasi

Sweeney

et al. 2020

Journal of Applied Ecology

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Time‐area closures are an important tool for reducing fisheries bycatch, but their effectiveness and economic impact can be influenced by the changes in species distributions. For fisheries targeting highly mobile species, the economic impact of a closure may by highly dynamic, depending on the current suitability of the closed area for the target species. We present an analysis to quantify the fine‐scale economic impact of time‐area closures: the ‘lost economic opportunity’, which is the percentage of total potential profit for an entire fishing season that occurs within and during a time‐area closure. Our analysis integrates a spatially explicit and environment‐informed catch model with a utility model that quantifies fishing revenues and costs, and thus incorporates a dynamic target species distribution in the estimated economic impact of a closure. We demonstrate this approach by evaluating the economic impact of the Loggerhead Conservation Area (LCA) on California's drift gillnet swordfish Xiphias gladius fishery. The lost economic opportunity due to the LCA time‐area closure ranged from 0% to 6% per season, with variation due to port location and trip duration, as well as inter‐annual changes in swordfish distribution. This increased by 40%–90% when a seasonally varying swordfish price was considered. There was a clear signal in economic impact associated with a shift from warm to cool conditions in the California Current following the 1998 El Niño, with increased lost economic opportunity from 1999. This signal was due to higher swordfish catch inside the LCA during the cool phase, associated with increased water column mixing, and due to higher catches outside the LCA in the warmer phase, associated with increased sea‐surface temperature. Synthesis and applications. We found small economic impact from a fishery closure, but with meaningful inter‐annual variation due to environmental change and the dynamic distribution of a target species. Our approach could be used to help determine the timing of closures, simulate impacts of proposed closures and, more generally, assess some economic consequences of climate‐induced shifts in species’ ranges.

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Section: Introductionmentioning

confidence: 99%

Lost opportunity: Quantifying the dynamic economic impact of time‐area fishery closures

Smith

Tommasi

Sweeney

et al. 2020

Journal of Applied Ecology

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Characterization of a developing recreational deep-drop fishery for swordfish off southern California

Aalbers

Wang

Bellquist

et al. 2022

California Fish and Wildlife Journal

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California recreational anglers have recently started using specific deep-drop tackle to target swordfish (Xiphius gladius) below the thermocline during the daytime. Increased rod-and-reel fishing effort stems from promising experimental fishing trials of a recently approved commercial gear type off California (deep-set buoy gear), along with the widespread growth of deep-drop recreational fisheries for swordfish around the world. The rapid development and vast growth potential in this emerging recreational fishery, has outpaced the implementation of sampling programs to accurately quantify swordfish catch, effort, and economic output. We characterized recent sportfishing practices for swordfish and reviewed available California recreational fishery data sources. Findings suggest a sharp increase in estimated catch relative to previous decades and a major shift in the techniques used by local fishers to target swordfish beginning in September 2019. Recent increases in recreational swordfish catches aligned directly with heightened tackle sales for gear specific to deep-drop practices. Given the increased deep-set effort for swordfish within the region and the limited coverage of existing private-vessel catch documentation, additional monitoring efforts are needed to better gauge the potential social, economic, and ecological impacts of this emerging recreational fishery.

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Evaluation of Fishing Opportunities under Sea Turtle Interaction Limits —A Decision Support Model for Hawaii-based Longline Swordfish, Xiphias gladius, Fishery Management

Abstract: ABSTRACT-Conservation measures of

Cited by 2 publications

References 4 publications

Lost opportunity: Quantifying the dynamic economic impact of time‐area fishery closures

Lost opportunity: Quantifying the dynamic economic impact of time‐area fishery closures

Characterization of a developing recreational deep-drop fishery for swordfish off southern California

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