Download or read book Development of Indices of Performance for the Newfoundland and Labrador Snow Crab Chionoecetes Opilio Fishery Using Data from a Vessel Monitoring System written by D. R. Mullowney and published by . This book was released on 2008 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Implementation of the International Plan of Action to Prevent Deter and Eliminate Illegal Unreported and Unregulated Fishing written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2023-12-17 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document complements previous technical guidance documents on planning and executing illegal, unreported and unregulated (IUU) fishing estimation studies by providing a catalogue of 26 estimation methodologies from published studies. These methodologies encompass a wide range of locations, fishing gear and IUU fishing types. The catalogue is organized around two ways of identifying relevant methodologies: a) the IUU fishing estimation approach; and b) the primary available data source. The five types of IUU fishing estimation approaches (“a”) include: 1) estimating total catch minus reported catch; 2) partitioning total catch into IUU/non-IUU fishing; 3) summing individual IUU fishing events to a total amount; 4) estimating “true” catches for suspect vessels or fleets; and 5) determining relative amounts or trends in IUU fishing. The four types of primary data sources (“b”) include: 1) fishery models; 2) commercial sources; 3) operational data; and 4) expert judgements, comparisons to catch compilations and stakeholder surveys. These two types of approaches help to identify the relevant methodologies presented as concise, individual one- to two-page summaries. Each methodology is described in terms of the key elements needed and how they can be sourced, the specific steps involved in constructing the estimate, and guidance on the applicability of the method.
Download or read book Offshore Energy and Marine Spatial Planning written by Katherine L. Yates and published by Routledge. This book was released on 2018-03-29 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The generation of offshore energy is a rapidly growing sector, competing for space in an already busy seascape. This book brings together the ecological, economic, and social implications of the spatial conflict this growth entails. Covering all energy-generation types (wind, wave, tidal, oil, and gas), it explores the direct and indirect impacts the growth of offshore energy generation has on both the marine environment and the existing uses of marine space. Chapters explore main issues associated with offshore energy, such as the displacement of existing activities and the negative impacts it can have on marine species and ecosystems. Chapters also discuss how the growth of offshore energy generation presents new opportunities for collaboration and co-location with other sectors, for example, the co-location of wild-capture fisheries and wind farms. The book integrates these issues and opportunities, and demonstrates the importance of holistic marine spatial planning for optimising the location of offshore energy-generation sites. It highlights the importance of stakeholder engagement in these planning processes and the role of integrated governance, with illustrative case studies from the United States, United Kingdom, northern Europe, and the Mediterranean. It also discusses trade-off analysis and decision theory and provides a range of tools and best practices to inform future planning processes.
Download or read book Working Towards a Blue Future Promoting Sustainability Environmental Protection and Marine Management Examples from the UK Government Blue Belt Programme and Current International Initiatives written by Paul Whomersley and published by Frontiers Media SA. This book was released on 2022-03-14 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of Newfoundland and Labrador Snow Crab in 2002 written by E. G. Dawe and published by . This book was released on 2003 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summaries of fishery performance in the Newfoundland & Labrador snow crab (Chionoecetes opilio) fishery are provided for Northwest Atlantic Fisheries Organization divisions 2J, 3, & 4R. Data from fall 1995-2002 multispecies bottom trawl surveys are presented to provide information on trends in biomass, production, & mortality over the time series. Multispecies survey indices are compared with other relevant indices derived from commercial fishery logbook data, observer data, and inshore Division 3K (north-east Newfoundland) trap survey data with regard to inferring changes in resource status for 2003 & beyond.
Download or read book An Assessment of Newfoundland and Labrador Snow Crab in 2002 written by Earl G. Dawe and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summaries of fishery performance in the Newfoundland & Labrador snow crab (Chionoecetes opilio) fishery are provided for Northwest Atlantic Fisheries Organization divisions 2J, 3, & 4R. Data from fall 1995-2002 multispecies bottom trawl surveys are presented to provide information on trends in biomass, production, & mortality over the time series. Multispecies survey indices are compared with other relevant indices derived from commercial fishery logbook data, observer data, and inshore Division 3K (north-east Newfoundland) trap survey data with regard to inferring changes in resource status for 2003 & beyond.
Download or read book A Review of Newfoundland and Labrador Snow Crab Chionoecetes Opilio Fishery Performance 1979 2005 written by D. M. Taylor and published by . This book was released on 2008 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of Newfoundland and Labrador Snow Crab in 2001 written by E.G. Dawe and published by . This book was released on 2002 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summaries of fishery performance in the Newfoundland & Labrador snow crab (Chionoecetes opilio) fishery are provided for 41 management areas within six Northwest Atlantic Fisheries Organization divisions. Comparative data are provided on yearly landings, effort, and catch per unit effort for each division. Factors involved in the observed trends in landings, spatial & depth distribution, biomass, size composition, exploitation rate, & biological conditions are explained and prospects for the fishery are discussed.
Download or read book Stock Assessment Report on Newfoundland and Labrador Snow Crab written by Canadian Science Advisory Secretariat and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a description of the snow crab (Chionoecetes opilio) fishery in Newfoundland and Labrador, as well as an assessment of the stock. The assessment is based on trends in fishery catch per unit of effort, exploitable biomass, recruitment prospects and mortality. Data were derived from fall multi-species bottom trawl surveys, inshore trap surveys, fishery data from logbooks, and observer catch-effort data, as well as biological sampling data from multiple sources.
Download or read book Stock Assessment Report on Newfoundland and Labrador Snow Crab written by and published by . This book was released on 2005 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a description of the snow crab (Chionoecetes opilio) fishery in Newfoundland and Labrador, as well as an assessment of the stock. The assessment is based on trends in fishery catch per unit of effort, exploitable biomass, recruitment prospects and mortality. Data were derived from fall multi-species bottom trawl surveys, inshore trap surveys, fishery data from logbooks, and observer catch-effort data, as well as biological sampling data from multiple sources.
Download or read book Assessment of the Newfoundland Snow Crab Chionoecetes Opilio Fishery 1989 written by and published by . This book was released on 1990 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction to this paper reviews the Newfoundland snow crab fishery and its management. The paper then presents an assessment of the fishery in 1989 based on a sample of fishery logbook & sales slip data and examination of crabs sampled from commercial catches & research surveys. Landings & catch per unit effort data are presented for each management area in the southern & northern zones, Labrador, and Division 3Ps (south coast). Results of research on the reproductive capacity of female crabs and on the relationship between claw size (chela height) & carapace width are also summarized.
Download or read book Analysis of the Snow Crab Chionoecetes Opilio Fishery in Newfoundland for 1987 written by David Michael Taylor and published by . This book was released on 1988 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reaching Management Objectives Given Uncertainty written by Cody S. Szuwalski and published by . This book was released on 2014 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The snow crab (Chionoecetes opilio) population in the eastern Bering Sea historically supported a lucrative fishery, but was declared overfished in 1999. The subsequent rebuilding plan did not rebuild the fishery in the time specified, and low recruitment over this period likely contributed to the failure. A key component of the rebuilding plan for snow crab was the stock assessment on which management advice was based. In common with all stock assessments, there are numerous potential sources of uncertainty associated with the snow crab assessment, but it is not clear which source is most influential. Consequently, it is unclear how research should be focused and how management should respond to these uncertainties. This dissertation: 1) examines the influence of uncertainty on the ability of the assessment method to estimate quantities important to management, 2) reviews existing information on possible environmental drivers of recruitment, 3) presents an `oscillating control' model that links recruitment to changes in the Pacific Decadal Oscillation (PDO), 4) evaluates management strategies given recruitment dynamics driven by the PDO and 5) explores the influence of spatial structure the snow crab population on assessment. The estimation ability of the assessment method was determined using management strategy evaluation methods. The results of the evaluation allowed biases that may have influenced the ability of the management strategy to rebuild the stock to be identified. When all assumptions are correct, the assessment method provides good estimates of management quantities, including mature male biomass and the overfishing level. Data to reduce uncertainty around growth and natural mortality would be most beneficial to improving confidence in assessment estimates of mature male biomass. The 1988/89 regime shift in the North Pacific appears to have shifted the drivers of recruitment dynamics from female spawning biomass to environmental influences related to the winter PDO (winds at Unimak pass and sea surface temperature were also important variables). This conceptual model was evaluated using cross-validation and retrospective analysis, both of which indicate that it is relatively robust to varying levels of information. A potential mechanism for this change in driver is the influence of temperature during regimes on the timing of the ice retreat and its associated consequences (e.g. food availability, length of the pelagic stage in snow crab, and size of cold pool) for the survival of pelagic larvae and juvenile crab. A management strategy evaluation framework using three scenarios (status-quo, regime-based and `oscillating control') for future recruitment was used to evaluate the performance of harvest control rules, including the status-quo, a regime-based approach, constant proportion strategies, and Hilborn's `hold-steady' method. In regime-driven systems, regime-based harvest control rules increase yield and decrease variability at the cost of a higher probability of overfishing. In non-regime-based systems, regime-based harvest control rules slightly decrease yield (with no change in variability), and increase the probability of overfishing under the definitions imposed by US legislation. Finally, the spatial assessment developed to estimate spatially explicit recruitment, fishing mortality and movement was unable to accurately estimate movement parameters, but reasonably good fits to the data were achieved. The fitted spatial population dynamics model was used to simulate data sets to test the ability of a non-spatially structured (aggregate) assessment method to estimate trends in abundance and fishing pressure in the presence of spatial structure. The aggregate assessment method performed well if survey selectivity was well known, but was unable to reliably capture the dynamics of the population without data on survey selectivity. Additional data on movement from tagging studies or winter surveys would be useful to improve the understanding of the influence of spatial structure on snow crab in the eastern Bering Sea.
Download or read book The Effects of Noise on Aquatic Life written by Arthur N. Popper and published by Springer Science & Business Media. This book was released on 2012-01-26 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second International Conference on the Effects of Noise on Aquatic Life will take place in Ireland August 15-20, 2010. The main emphasis of the conference will be on defining the current state of knowledge. However, we will also assess progress in the three years since the First conference. The Second conference will place strong emphasis on recent research results, the sharing of ideas, discussion of experimental approaches, and analysis of regulatory issues.
Download or read book Impacts of climate change on fisheries and aquaculture written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-01-06 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report indicates that climate change will significantly affect the availability and trade of fish products, especially for those countries most dependent on the sector, and calls for effective adaptation and mitigation actions encompassing food production.
Download or read book Examination of the Factors Affecting the Sustainability of the Newfoundland and Labrador Snow Crab Fishery written by Noel C. Milley and published by . This book was released on 2005 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Performance for the Newfoundland and Labrador Snow Crab Fishery written by David Michael Taylor and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
