Quantification of annual variations in fishing power due to vessel characteristics: an application to the bottom-trawlers of South-Brittany targeting anglerfish (Lophius budegassa and Lophius piscatorius)

Mahévas, Stéphanie; Sandon, Y; Biseau, Alain

doi:10.1016/j.icesjms.2003.09.002

Cited by 30 publications

(23 citation statements)

References 35 publications

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“…The significance of landing port:vessel length interaction corroborates this conclusion, which could mean that the landing rate depends not only on the availability of the resource to the fishery but also on the importance that the technical characteristics of the vessels have for the success of the catch, which has also been outlined by several authors (e.g. Goñi et al 1999;Ye et al 2001;Maynou et al 2003;Mahévas et al 2004). The value of landings depends not only the high spatial and temporal variability of resources and the technical characteristics of the vessels, but also on the quantity of fish landed.…”

Section: Discussionsupporting

confidence: 75%

Landing profiles and typologies of flatfish fisheries on the Portuguese coast

Teixeira

Batista

Cabral

2011

Aquat. Living Resour.

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-Flatfishes represent an important resource in Portuguese fisheries. Although flatfish landings represent a low percentage of total fish weight landed, their importance is higher when commercial value is considered (11%). Official data on flatfish landings from 1992 to 2005 for all landing ports in Portugal were analysed, together with vessel characteristics, in order to detect patterns in flatfish fisheries. Fleet characteristics were heterogeneous, but most of the vessels were multi-gear. Three landing profiles were identified in the flatfish fishery, and the target species of these métiers showed variation in space and in time. Small vessels caught species that occur in coastal areas, mainly soles, bastard sole, flounder, turbot and brill, and usually also presented high landings of octopuses, cuttlefish and rays. Megrims and spotted flounder were caught with others species, like small pelagic fishes and seabreams by coastal trawlers. For this fleet component, catches of flatfish were usually bycatch. Generalized Linear Models (GLM) were used to analyse flatfish landings (LPUE, landings per unit effort and landings in terms of value) between 1992 and 2005 and to evaluate their relationships with several variables. The main effects in the models included year, month, landing port, vessel length class and total landings (kg). The models explained between 15% and 60% of the variability of the LPUE, and 46% to 82% of the variability of landing value, for the flatfish groups considered, with the most important factors being landing port, vessel length class, month, total landing (kg) and landing port: vessel length interaction. These results suggest high spatial and temporal variability. The results of this study may have implications for fishery management, because the LPUE was highest during the important periods of flatfish life cycles, like the spawning season. This fishing pattern has a negative impact on the stocks because of increased fishing pressure during a sensitive period for these species. The adoption of spatial and temporal closures should be implemented.

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Section: Discussionsupporting

confidence: 75%

Landing profiles and typologies of flatfish fisheries on the Portuguese coast

Teixeira

Batista

Cabral

2011

Aquat. Living Resour.

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“…However, their influence was small relative to vessel characteristics and variation in technical efficiency only explained 7% of variation in catch. In further contrast, within the anglerfish (Lophius budegassa) trawl fishery in South-Brittany, number of years at the helm had no significant effect on catch per unit of effort, whereas type of fishing gear used had a large effect (Mahévas et al, 2004).…”

Section: Introductionmentioning

confidence: 81%

Skippers, spotters and seiners: Analysis of the “skipper effect” in US menhaden (Brevoortia spp.) purse-seine fisheries

Ruttan

Tyedmers

2007

Fisheries Research

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“…small-scale spatial allocation of effort or technical settings) on catch composition, often interpreted in terms of fishing power directed at some target species (e.g., Lewy and Vinther 1992;He et al 1997;Pech and Laloë 1997;Marchal et al 2006;Quirijns et al 2008). On a much longer time-scale, trends in the catch composition of vessels or fleets reflect long-term trends in species availability and the changes in fishing strategies (large-scale spatial effort allocation and species targeting) that result from these changes, but also from changes in regulations (Holley and Marchal 2004), in fleet size and composition (Bertignac 1992) and technical progress (Mahévas et al 2004). At an intermediate scale, year-to-year variations in catch composition should reflect fluctuations and short-term trends in fish abundance and communities and in the annual amount of effort as measured by e.g.…”

Section: Introductionmentioning

confidence: 99%

Fishing fleet typology, economic dependence, and species landing profiles of the French fleets in the Bay of Biscay, 2000-2006

Daures

Rochet

Iseghem

et al. 2009

Aquat. Living Resour.

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-Thirty French fleets fishing primarily in the Bay of Biscay were defined based on techno-economic input criteria: i) 18 fishing gear or gear combinations ii) the location of fishing grounds visited during a year (<12 nautical miles from coast, beyond 12 nm or both) and iii) total vessel length (<20 m for trawlers and other gears <24 m). The fleets were then characterised in terms of horse power, economic dependence on a list of nine dominant commercial species (sole, Nephrops, sea bass, hake, monkfish, anchovy, cuttlefish, sardine and squid) and their contribution to the landings of these species from the Bay of Biscay. Most fleets derived the majority of their income from one or two among the nine species. Species dependencies changed little during the study period, except for those vessels targeting anchovy before the fishery restrictions starting in 2005. Fish community impacts were compared based on fleet landings' profiles. Twelve landings profiles were determined using hierarchical cluster analysis. Fleets using similar gears had the same landings' profiles and therefore exercised similar pressures on the ecosystem, though not always in the same areas. The depletion of anchovy and the closure of the fishery lead to a change in landings profile for offshore pelagic trawlers from anchovy dominance to one with a larger proportion of albacore and sea bass. During the study period, the overall vessel number decreased from 2163 to 1845. Few vessels changed fleets, but if they did, they primarily started to fish closer to the coast, which might be a result of increasing fuel prices.

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Quantification of annual variations in fishing power due to vessel characteristics: an application to the bottom-trawlers of South-Brittany targeting anglerfish (Lophius budegassa and Lophius piscatorius)

Cited by 30 publications

References 35 publications

Landing profiles and typologies of flatfish fisheries on the Portuguese coast

Landing profiles and typologies of flatfish fisheries on the Portuguese coast

Skippers, spotters and seiners: Analysis of the “skipper effect” in US menhaden (Brevoortia spp.) purse-seine fisheries

Fishing fleet typology, economic dependence, and species landing profiles of the French fleets in the Bay of Biscay, 2000-2006

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