The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Fabio Fiorentino - One of the best experts on this subject based on the ideXlab platform.
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SMART: a spatially explicit bio-economic model for assessing and managing Demersal fisheries, with an application to italian trawlers in the strait of sicily.
PloS one, 2014Co-Authors: Tommaso Russo, Antonio Parisi, Germana Garofalo, Michele Gristina, Stefano Cataudella, Fabio FiorentinoAbstract:Management of catches, effort and exploitation pattern are considered the most effective measures to control fishing mortality and ultimately ensure productivity and sustainability of fisheries. Despite the growing concerns about the spatial dimension of fisheries, the distribution of resources and fishing effort in space is seldom considered in assessment and management processes. Here we propose SMART (Spatial MAnagement of Demersal Resources for Trawl fisheries), a tool for assessing bio-economic feedback in different management scenarios. SMART combines information from different tasks gathered within the European Data Collection Framework on fisheries and is composed of: 1) spatial models of fishing effort, environmental characteristics and distribution of Demersal resources; 2) an Artificial Neural Network which captures the relationships among these aspects in a spatially explicit way and uses them to predict resources abundances; 3) a deterministic module which analyzes the size structure of catches and the associated revenues, according to different spatially-based management scenarios. SMART is applied to Demersal Fishery in the Strait of Sicily, one of the most productive fisheries of the Mediterranean Sea. Three of the main target species are used as proxies for the whole range exploited by trawlers. After training, SMART is used to evaluate different management scenarios, including spatial closures, using a simulation approach that mimics the recent exploitation patterns. Results evidence good model performance, with a noteworthy coherence and reliability of outputs for the different components. Among others, the main finding is that a partial improvement in resource conditions can be achieved by means of nursery closures, even if the overall fishing effort in the area remains stable. Accordingly, a series of strategically designed areas of trawling closures could significantly improve the resource conditions of Demersal fisheries in the Strait of Sicily, also supporting sustainable economic returns for fishermen if not applied simultaneously for different species.
Tommaso Russo - One of the best experts on this subject based on the ideXlab platform.
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SMART: a spatially explicit bio-economic model for assessing and managing Demersal fisheries, with an application to italian trawlers in the strait of sicily.
PloS one, 2014Co-Authors: Tommaso Russo, Antonio Parisi, Germana Garofalo, Michele Gristina, Stefano Cataudella, Fabio FiorentinoAbstract:Management of catches, effort and exploitation pattern are considered the most effective measures to control fishing mortality and ultimately ensure productivity and sustainability of fisheries. Despite the growing concerns about the spatial dimension of fisheries, the distribution of resources and fishing effort in space is seldom considered in assessment and management processes. Here we propose SMART (Spatial MAnagement of Demersal Resources for Trawl fisheries), a tool for assessing bio-economic feedback in different management scenarios. SMART combines information from different tasks gathered within the European Data Collection Framework on fisheries and is composed of: 1) spatial models of fishing effort, environmental characteristics and distribution of Demersal resources; 2) an Artificial Neural Network which captures the relationships among these aspects in a spatially explicit way and uses them to predict resources abundances; 3) a deterministic module which analyzes the size structure of catches and the associated revenues, according to different spatially-based management scenarios. SMART is applied to Demersal Fishery in the Strait of Sicily, one of the most productive fisheries of the Mediterranean Sea. Three of the main target species are used as proxies for the whole range exploited by trawlers. After training, SMART is used to evaluate different management scenarios, including spatial closures, using a simulation approach that mimics the recent exploitation patterns. Results evidence good model performance, with a noteworthy coherence and reliability of outputs for the different components. Among others, the main finding is that a partial improvement in resource conditions can be achieved by means of nursery closures, even if the overall fishing effort in the area remains stable. Accordingly, a series of strategically designed areas of trawling closures could significantly improve the resource conditions of Demersal fisheries in the Strait of Sicily, also supporting sustainable economic returns for fishermen if not applied simultaneously for different species.
Bertrand Gobert - One of the best experts on this subject based on the ideXlab platform.
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size structures of Demersal catches in a multispecies multigear tropical Fishery
Fisheries Research, 1994Co-Authors: Bertrand GobertAbstract:Abstract The overall size structure of catches was studied in the multispecific, multigear, Demersal Fishery of Martinique (Lesser Antilles). The results show that the Fishery is presently based not only on small-sized sized species, but also on small-or medium-sized individuals of these species. Most of the catch is made up of species able to withstand its selectivity and effort, with larger species having been eliminated through overfishing. An exponential decrease of length frequencies for aggregated catches or samples was observed in the 2 years sampled, and could be due to some inherent size structure of the fish community. Such integrated analyses are useful complements to single-species assessment approaches inadequate to describe the dynamics of highly multispecific resources such as reef fish communities.
Guðrún Marteinsdóttir - One of the best experts on this subject based on the ideXlab platform.
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how a catch quota balancing system can go wrong an evaluation of the species quota transformation provisions in the icelandic multispecies Demersal Fishery
Ices Journal of Marine Science, 2015Co-Authors: Pamela J. Woods, Daniel S. Holland, Guðrún Marteinsdóttir, André E. PuntAbstract:Pamela J. Woods1‡, Daniel S. Holland2, Guðrun Marteinsdottir3, and Andre E. Punt1 School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA Northwest Fisheries Science Center, NMFS, NOAA, Seattle, WA 98192, USA MARICE, Faculty of Life and Environmental Sciences, University of Iceland, 101 Reykjavik, Iceland *Corresponding author: tel: +354 894 0342; fax: +354 525 4499; e-mail: pamelajwoods@gmail.com Present address: MARICE, Faculty of Life and Environmental Sciences, University of Iceland, 101 Reykjavik, Iceland.
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Catch-quota balancing mechanisms in the Icelandic multi-species Demersal Fishery: Are all species equal?
Marine Policy, 2015Co-Authors: Pamela J. Woods, Caroline Bouchard, Daniel S. Holland, André E. Punt, Guðrún MarteinsdóttirAbstract:In this study, utilization of catch-quota balancing mechanisms in the Icelandic Demersal Fishery, which allow for individual transferable quota to be transformed among species and transferred between years, is analyzed to determine whether annual catches closely adhere to total allowable catches on average. Icelandic landings data for 14 Demersal fish species during 2001–2013 are compared to implemented total allowable catches as well as catch limits recommended by the Marine Research Institute (MRI) and a proxy for annual market values. Landings surpassed legal limits of total allowable catch in 27% of the cases (landings by species by fishing year), mostly due to species transformations, but TAC overages were not consistent for any species. Instead, catches of some species were consistently less than legal limits, with some indications that landings were related to profitability (i.e. landings were correlated with market value). However, landings surpassed MRI recommendations in 67% of the cases, and landings of four species (Atlantic wolffish, haddock, monkfish and redfish) consistently exceeded MRI recommendations. Therefore, discrepancies between scientific recommendations for catch limits and quotas selected through the political process may represent a higher risk to long-term sustainability than catch-quota balancing mechanisms.
Rene Holst - One of the best experts on this subject based on the ideXlab platform.
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exit windows as an alternative selective system for the barents sea Demersal Fishery for cod and haddock
Fisheries Research, 2007Co-Authors: Eduardo Grimaldo, Roger B Larsen, Rene HolstAbstract:Abstract During a 4-year research period, trouser trawl experiments were performed to assess the cod and haddock selection capacity of a codend fitted with two 130 mm exit windows. These windows, which were 10 meshes high and 45 meshes long, were inserted in the rearmost part of the codend. The results showed that this codend was very efficient in releasing large amounts of undersized fish and the 50% retention length (l50) was far above the minimum landing size (MLS) for both the analysed species (the MLS for cod is 47 cm, 44 cm for haddock). For cod, the mean l50 values varied between 53.6 and 57.3 cm and the mean selection range (SR) values from 6.8 to 9.3 cm. Haddock was measured during two trials with the mean l50 at 50.5 and 50.6 cm; and the mean SR values at 6.3 and 6.0 cm. Total catch weights varied between 0.7 and 6.6 metric tonnes. In some cases an important effect of catch weights upon the l50 could be detected.