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30 results for “fisheries catch”
HISTORICAL RECONSTRUCTION OF FISHERY CATCHES FOR THE LAKE GARDA
<p>Dataset on the catches of the commercial fishery in lake Garda, published in:</p> <p>ZUCCHETTA, Matteo et al. Ricostruzione storica delle catture della pesca nel lago di Garda. <strong>ITALIAN JOURNAL OF FRESHWATER ICHTHYOLOGY</strong>, [S.l.], v. 1, n. 5, p. 325-332, set. 2019. Disponibile all'indirizzo: <<a href="http://www.aiiad.it/ijfi/index.php/ijfi/article/view/159">http://www.aiiad.it/ijfi/index.php/ijfi/article/view/159</a>>. Data di accesso: 13 dic. 2019</p>
Data from: All is fish that comes to the net: metabarcoding for rapid fisheries catch assessment
AbstractMonitoring marine resource exploitation is a key activity in fisheries science and biodiversity conservation. Since research surveys are time-consuming and costly, fishery-dependent data (i.e. derived directly from fishing vessels) are increasingly credited with a key role in expanding the reach of ocean monitoring. Fishing vessels may be seen as widely ranging data-collecting platforms, which could act as a fleet of sentinels for monitoring marine life, in particular exploited stocks. Here, we investigate the possibility of assessing catch composition of single hauls carried out by trawlers by applying DNA metabarcoding to the "slush" collected from fishing nets just after the end of hauling operations. We assess the performance of this approach in portraying β-diversity and examining the quantitative relationship between species abundances in the catch and DNA amount in the slush (reads counts generated by amplicon sequencing). We demonstrate that the assemblages identified using DNA in the slush mirror those returned by visual inspection of net content and detect a strong relationship between read counts and species abundances in the catch. We therefore argue that this approach could be upscaled to serve as a powerful source of information on the structure of demersal assemblages and the impact of fisheries.
Data from: Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining
Fisheries data assembled by the Food and Agriculture Organization (FAO) suggest that global marine fisheries catches increased to 86 million tonnes in 1996, then slightly declined. Here, using a decade-long multinational 'catch reconstruction' project covering the Exclusive Economic Zones of the world's maritime countries and the High Seas from 1950 to 2010, and accounting for all fisheries, we identify catch trajectories differing considerably from the national data submitted to the FAO. We suggest that catch actually peaked at 130 million tonnes, and has been declining much more strongly since. This decline in reconstructed catches reflects declines in industrial catches and to a smaller extent declining discards, despite industrial fishing having expanded from industrialized countries to the waters of developing countries. The differing trajectories documented here suggest a need for improved monitoring of all fisheries, including often neglected small-scale fisheries, and illegal and other problematic fisheries, as well as discarded bycatch.
Data from: Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining
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Data from: All is fish that comes to the net: metabarcoding for rapid fisheries catch assessment
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Efficacy of a novel galvanic shark deterrent to reduce catch of elasmobranchs in longline fisheries
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Seasonal ocean forecasts to improve predictions of Dungeness crab catch rates, co-developed with state and tribal fishery managers
<p>Historical (hindcast) and September initialized forecast fields from the J-SCOPE system (more information here: https://www.nanoos.org/products/j-scope/). The historical fields are annual averages while the forecasts are averaged monthly. The fields here were used to generate the CPUE models described in Norton et al. (2023). </p> <p>Abstract from the paper: The commercial Dungeness crab (Metacarcinus magister) fishery in Oregon and Washington (USA) is one of the most valuable fisheries in the region, but it experiences high interannual variability. These fluctuations have been attributed to environmental drivers on seasonal and annual timescales. In this study, researchers and state and tribal fisheries managers develop a statistical model for Dungeness crab catch per unit effort (CPUE) to help inform dynamic management decisions in Oregon and Washington. Fishing observations were matched to seasonally forecast and lagged ocean conditions from J-SCOPE, a regional forecast system (http://www.nanoos.org/products/j-scope/). Inclusion of dynamic and lagged ocean conditions improved model skill compared to simpler models, and the best model captured intraseasonal trends and interannual variability in catch rates, and spatial catch patterns. We also found that model skill relied on fishing behaviour, which varies interannually, highlighting the need for advanced fishing behaviour modelling to reduce uncertainty. The relationships between catch rates and ocean conditions may help elucidate environmental influences of catch variability. Forecast products were co-designed with managers to meet their needs for key decision points. Our results illustrate a seasonal forecasting approach for management of other highly productive, but also dynamic, invertebrates that increasingly contribute to global fisheries yield.</p>
Identification and characterization of Western Province reef fisheries; Developing management and conservation protocols using traditional ecological knowledge, underwater monitoring and catch assessments
<p>Solomon Islands has highly biodiverse coral reef ecosystems critically important to cultural identity and socio-economic security. Because Solomon Islanders maintain among the highest global fish consumption rates largely from inshore fisheries valued at USD$65 million yr<sup>-1</sup>, maintaining these resources is critical to livelihoods and health. Among these resources are coral reef fish that form (fish) spawning aggregations (FSA). For these species, FSAs are the primary means of population replenishment and form the basis of a trophic web ranging from detritivores to marine megafauna. FSAs are highly vulnerable to overfishing and in Solomon Islands have experienced increasing fishing pressure from a changing economy and a domestic export fishery. Recent estimates show Western Province exporting at least 6 mt mo<sup>-1</sup> to Honiara markets, with an unknown but substantial quantity of this supply derived from FSAs. In Solomon Islands, marine tenure remains a core element of coral reef management, but its effectiveness relies on community awareness and participation in monitoring. The project seeks to improve site-based and national scale enabling conditions for FSA management through: (1) evaluating FSA sites known to be experiencing fishing; (2) providing awareness presentations to traditional reef owners; (3) training local communities and dive operator staff in developing appropriate monitoring protocols; (3) implementing these protocols at known FSA sites; (4) co-developing EAFM plans with traditional reef owners and dive operators; (5) providing information sharing from successful regional LMMAs; (6) working to improve enforcement of existing FSA regulations and local and provincial scales; and (7) building consensus to adapt existing regulations to improve management effectiveness.</p>
Identification and characterization of Western Province reef fisheries; Developing management and conservation protocols using traditional ecological knowledge, underwater monitoring and catch assessments
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Data from: Catch diversification provides multiple benefits in inland fisheries
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