A Robust Métier-Based Approach to Classifying Fishing Practices Within Commercial Fisheries

Parsa, Mahdi; Emery, Timothy J.; Williams, Ashley J.; Nicol, Simon

doi:10.3389/fmars.2020.552391

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…Métiers can be used as a baseline in our understanding of fishers' behavior through the characterization of individual trips and fishing pressure on certain species, giving fisheries managers additional insight for informed advice [35]. In the present study, the initial cluster analysis resulted in the definition of seven strongly or reasonably structured clusters, providing the foundation to define potential métiers using gear type, which was found to be the strongest explanatory variable for these métiers.…”

Section: Discussionmentioning

confidence: 84%

Identifying Métiers Using Landings Profiles: An Octopus-Driven Multi-Gear Coastal Fleet

Szynaka

Erzini

Gonçalves

et al. 2021

JMSE

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The multi-gear coastal vessels in the Algarve (South Portugal) own licenses for various fishing gears. However, it is generally uncertain what gears they use, which is problematic as each individual gear is responsible for unique impacts on the resources and the environment. In this study, landing profiles identified for the multi-gear coastal fleet (2012–2016) were used as support in defining potential métiers using k-mean clustering analysis (CLARA) along with information from past studies on métiers. The results showed that more than 50% of the vessels were engaged in the octopus fishery year-round, using traps, while a small percentage (~13%) were entirely dedicated to clam dredging. In general, gillnets (21%) were used to target monkfish, hake and bastard soles, while trammel nets (6%) were used to target cuttlefish, with some vessels alternating the fishing gears (either seasonally or annually) according to target species. The method for the initial characterization of this fleet’s métiers and its efficiency with limited data is discussed, as well as the utility of this segmentation in support of management advice.

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Section: Discussionmentioning

confidence: 84%

Identifying Métiers Using Landings Profiles: An Octopus-Driven Multi-Gear Coastal Fleet

Szynaka

Erzini

Gonçalves

et al. 2021

JMSE

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“…Despite the low temperatures experienced by swordfish in the mesopelagic, previous studies also inferred a lack of thermal limitation at depth 8 , 14 , 15 , perhaps because swordfish have a suite of functional adaptations for success in the mesopelagic zone. Large eyes 86 with a uniquely adapted muscle that warms the brain and eyes 87 up to 15 °C above ambient water temperature 27 likely facilitate predatory success in dark cold water by providing superior visual acuity 88 . Unique cardiorespiratory adaptations 89 – 91 appear to maintain function at low oxygen concentrations and across rapid large temperature changes experienced during vertical migration (e.g., swings of up to ∆ 22 °C between day and subsequent night in this study).…”

Section: Discussionmentioning

confidence: 99%

Movement behavior of swordfish provisions connectivity between the temperate and tropical southwest Pacific Ocean

Tracey

Wolfe

Hartmann

et al. 2023

Sci Rep

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Swordfish (Xiphias gladius) are a widely distributed (45°N–45°S) large pelagic fish targeted by fisheries worldwide. Swordfish that occur at high latitudes tend to disproportionately be large adults, so their movements have implications for population dynamics and fisheries management. In the southwest Pacific, little is known about this subset of the stock and existing evidence suggests limited movement from the subtropics into cooler high latitude waters. Here, we capitalize on the recent emergence of a recreational swordfish fishery off temperate southeast Australia to characterize movements of swordfish caught in the fishery with pop-up satellite archival transmitting tags. Data were recovered from tags deployed for 56–250 days on 11 swordfish (50–350 kg) tagged between 38 and 43°S in the western Tasman Sea. Five swordfish entered the Coral Sea (< 30°S), with four reaching north to 11–24°S, up to 3275 km away from location of capture. Behavior modelling suggests these four individuals rapidly transited north until encountering 23–27 °C water, at which point they lingered in the area for several months, consistent with spawning-related partial migration. One migrating swordfish still carrying a tag after the spawning season returned to ~ 120 km of its release location, suggesting site fidelity. Movements toward the central south Pacific were confined to two individuals crossing 165°E. Swordfish predominantly underwent normal diel vertical migration, descending into the mesopelagic zone at dawn (median daytime depth 494.9 m, 95% CI 460.4–529.5 m). Light attenuation predicted daytime depth, with swordfish rising by up to 195 m in turbid water. At night, swordfish were deeper during the full moon, median night-time depth 45.8 m (37.8–55.5) m versus 18.0 m (14.9–21.8) m at new moon. Modelling fine-scale (10 min−1) swordfish depth revealed dynamic effects of moon phase varying predictably across time of night with implications for fisheries interactions. Studying highly migratory fishes near distribution limits allows characterization of the full range of movement phenotypes within a population, a key consideration for important fish stocks in changing oceans.

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“…This approach to defining the fleet structure and catch métier in mixed fisheries was applied successfully. Differently from the traditional clustering approach, this hierarchical clustering framework provided a novel choice for classifying the relationship of the catch métiers [57].…”

Section: Discussionmentioning

confidence: 99%

Application of Métier-Based Approaches for Spatial Planning and Management: A Case Study on a Mixed Trawl Fishery in Taiwan

Lee

et al. 2021

JMSE

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Mixed fisheries refer to fishing activities that catch more than one species simultaneously, and a species may be fished using different gear. A trawl fishery shares these features to exploit multiple species simultaneously, with diverse fishing gear and strategies. The situation becomes more complex when interactions among fleet dynamics, fishing activities, and fishery resources are involved and influence each other. Information regarding the operational patterns may be hidden in a set of long-term big data. This study aims to investigate the fishery structure and fleet dynamics of trawl fisheries in Taiwan for spatial planning and management, based on a long-term dataset from a management system that collects information by using voyage data recorders (VDR) and dockside observers. We applied a two-step data mining process with a clustering algorithm to classify the main groups of fishery resources and then identified 18 catch métiers based on catch composition. The target species, operation pattern, and fishing season were determined for each métier, and associated with the relevant fishery resources and the fishing gear used. Additionally, fishing effects on target species were estimated using information on fishing grounds and trajectories from VDR. The métier-based approach was successfully applied to define the six major fishery resources targeted by trawlers. We examined the key features of fishing activity associated with catch composition and spatial-temporal fishing metrics, which could be used to provide suggestions for the spatial planning and management of the mixed trawl fishery in the offshore waters of Taiwan.

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A Robust Métier-Based Approach to Classifying Fishing Practices Within Commercial Fisheries

Cited by 8 publications

References 48 publications

Identifying Métiers Using Landings Profiles: An Octopus-Driven Multi-Gear Coastal Fleet

Identifying Métiers Using Landings Profiles: An Octopus-Driven Multi-Gear Coastal Fleet

Movement behavior of swordfish provisions connectivity between the temperate and tropical southwest Pacific Ocean

Application of Métier-Based Approaches for Spatial Planning and Management: A Case Study on a Mixed Trawl Fishery in Taiwan

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