Download or read book Assessment of the Georges Bank Cod Stock for 1994 written by F.M. Serchuk and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of the Georges Bank cod (Gadus morhua) stock is reviewed and estimates of 1993 fishing mortality and 1994 stock size and spawning stock biomass are presented. Forecasts of 1995 landings and resulting 1996 spawning stock biomass at various levels of 1995 fishing mortality are also given. The 1994 assessment was based on several diverse sources of information including: USA and Canadian landings at age estimates, USA spring and autumn and Canadian spring research vessel survey data, and standardized USA commercial fishing effort data. Total landings of Georges Bank cod declined in 1993 to 23,100 metric tons (t) from a recent high of 42,500 t in 1990, a decrease of about 50% and the lowest annual total since the mid-1970s. USA landings have exhibited a proportional decrease similar to the overall trend. Despite sharp recent declines in landings, biological sampling has remained relatively intense. Commercial landings per unit of standardized effort declined steadily between 1982 and 1987, appeared to stabilize at the low 1987 level through 1991, but declined sharply in 1992 and, to a lesser extent, in 1993. Fishery-independent spring and autumn bottom trawl surveys conducted by the Northeast Fisheries Science Center (NEFSC) have also documented a steady decline in total stock biomass since the early 1970s; the largest decreases have occurred since 1980. The 1993 and 1994 indices suggest that the Georges Bank cod stock is at a record-low biomass level. Recent recruitment indices of age 1 and 2 cod from the NEFSC autumn surveys have been well below levels observed prior to 1980. Of these, only the 1983, 1985 and 1987 year classes were above average, but year classes appearing since 1987 have been weak. Spawning stock biomass has declined from about 90,000 t during the early 1980s to record low levels of 37,200 t in 1993 and 29,100 t in 1994. At the present level of exploitation, the spawning stock is expected to decline further through 1997. Fishing mortality doubled between 1979 and 1985, declined briefly, but increased again in 1988 and reached a record-high level of 0.91 in 1993, resulting in an exploitation rate of about 55%. At the present level of exploitation, landings from this stock are expected to decline to less than 13,000 t in 1995 and spawning stock biomass is projected to decline to about 17,000 t in 1996.

Download or read book Review of Northeast Fishery Stock Assessments written by National Research Council and published by National Academies Press. This book was released on 1998-04-17 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The collapse of cod, flounder, and haddock fish stocks in the Northeast United States has caused widespread concern among managers and fishers in the United States and Canada. The diminishing stocks have forced managers to take strict regulatory measures. Numerous questions have been raised about the adequacy of stock assessment science used to evaluate the status of these stocks and the appropriateness of the management measures taken. Based on these concerns, Congress mandated that a scientific review of the methodology and data used to evaluate these stocks be conducted. In this volume, the committee concludes that although there are improvements to be made in data collection, modeling uncertainty, and communicating between fishers, managers, and scientists, the scientific methods used in the Northeast stock assessments are sound. Recommendations are made on how the stock assessment process can be improved.

Download or read book Assessment of the Georges Bank Atlantic Cod Stock for 2005 written by Loretta O'Brien and published by . This book was released on 2006 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents an updated analytical assessment of the status of the Georges Bank Atlantic cod Gadus morhua stock (NAFO Division 5Z and Subarea 6) for the period 1978-2004 based on analysis of USA and Canadian commercial landings data and research vessel survey data through 2004. Estimates of 2004 fishing mortality and spawning stock biomass, 2005 beginning year stock size, and the precision of the fishing mortality and spawning stock biomass estimates are presented. Total commercial landings of Georges Bank cod in 2004 were estimated at a record low 4,583 mt, a 42% decrease from the 7,963 mt landed in 2003. The USA fleet landed 76% of the total, and the Canadian fleet landed the remaining 24%. Fishery-independent surveys conducted by the Northeast Fisheries Science Center show similar trends in both biomass and numbers of cod since 1982. The 2004 indices remain below the long term average. Autumn recruitment indices of age 1 cod have been below the time series average since 1989 and among the lowest in the time series. Spawning stock biomass declined from about 93,000 mt in 1980 to a record low of 17,340 mt in 1995, and had increased to 30,000 mt by 2001 primarily due to the growth of the 1996 and 1998 year classes. The 2004 estimate of SSB was 22,564 mt, a decrease of 25% from 2001. Fishing mortality doubled between 1979 and 1985, increased to a record high of 1.5 (72% exploitation rate) in 1994, and has since declined to 0.24 (19% exploitation rate) in 2004. The 2004 year class (10.4 million age 1 fish) was strong, but below the time series average (14.7 million age 1 fish). The 2003 year class (21.2 million age 1 fish), however, is the first above average year class since 1989. This year class, and continued low exploitation with minimal discarding, offer a realistic opportunity for the stock to recover toward the SSBMSY of 217,000 mt.

Download or read book Assessment of the Georges Bank Cod Stock for 1992 written by Fredric M. Serchuk and published by . This book was released on 1993 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Report of the 3rd Transboundary Resources Assessment Committee Meeting written by Russell W. Brown and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents an updated analytical assessment of the status of the Georges Bank cod Gadus morhua stock (NAFO Division 5Z and subarea 6) for the period 1978-1999 based on analysis of USA and Canadian commercial landings and effort data and research vessel survey data through 1999. Estimates of 1999 fishing mortality and spawning stock biomass, 2000 beginning year stock size, and the precision of the fishing mortality and spawning stock biomass estimates are presented. Total commercial landings of Georges Bank cod in 1999 were estimated at 9,880 mt, a 12% increase from the 8,800 mt landed in 1998. The USA fleet landed 82% of the total, and the Canadian fleet landed the remaining 18%. Commercial landings per unit of standardized effort (LPUE) declined to a record low in 1995, then increased in 1996 and 1997 and have remained relatively stable through 1999. Fishery-independent surveys, conducted by the Northeast Fisheries Science Center, show a similar decline in both biomass and numbers of cod since 1982. The 1999 indices remain well below the long term average. Recent recruitment indices of age 1 cod remain among the lowest in the time series, however, indices of age 2 fish indicate that the 1996 year class is about average. Spawning stock biomass declined from about 92,000 mt in the early 1980s to a record low of 20,000 mt in 1994 and has since increased to 35,000 mt in 1999. Mean biomass exhibits similar trends. Fishing mortality doubled between 1979 and 1985, increased to a record high of 1.42 (70% exploitation rate) in 1994 and has since declined to 0.22 (18% exploitation rate) in 1999. Recruiting year classes have been well below the long term average (16 million fish) since 1991.

Download or read book Assessment of the Georges Bank Cod Stock for 1993 written by Ralph K. Mayo and published by . This book was released on 1994 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment and Status of the Georges Bank and Gulf of Maine Atlantic Cod Stocks 1981 written by Fredric Michael Serchuk and published by . This book was released on 1981 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Report of the 24th Northeast Regional Stock Assessment Workshop written by Loretta O'Brien and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The status of the Gulf of Maine cod (Gadus morhua) stock is reviewed, and estimates of 1997 fishing mortality and spawning stock biomass and the 1998 survivors are presented. Precision of the 1997 fishing mortality and spawning stock biomass estimates for Gulf of Maine cod is also provided. Short-term projections of 1999 landings and resulting 2000 spawning stock biomass at sources of information including: USA landings-at-age estimates, Northeast Fisheries Science Center (NEFSC) and Massachusetts Division of Marine Fisheries (DMF) spring and autumn research vessel survey data, NEFSC sea sample data, and standardized USA commercial fishing effort data. This assessment updates the analyses presented in the 1997 assessment of the Gulf of Maine cod stock (Mayo 1998).

Download or read book Biology and Ecology of Atlantic Cod written by Nataliia Kulatska and published by CRC Press. This book was released on 2024-10-31 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic cod is an important fish species in human history and continues to be a major influence on North Atlantic fisheries management, as stock collapses and recoveries impact coastal communities and shelf sea food webs. This book provides an overview of Atlantic cod biology and ecology, focussing on regional differences in life-history and stock dynamics that affect productivity and the challenges faced by management. By comparing the success of management approaches and the local influence of changing climate and food webs, the book highlights the different pressures facing stocks and identifies knowledge gaps across the species’ range.

Download or read book Fisheries Review written by and published by . This book was released on 1994 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Fisheries Review written by and published by . This book was released on 2017 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of the Georges Bank Atlantic Cod Stock for 2001 written by Loretta O'Brien and published by . This book was released on 2001 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Property Rights in Fisheries Management written by Ross Shotton and published by Food & Agriculture Org.. This book was released on 2000 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: The session was closed with papers that provided a prognosis on the future development of property rights in fisheries management. Thus, the conference papers addressed the theory and application of property.

Download or read book Scallops Biology Ecology and Aquaculture written by Sandra E. Shumway and published by Elsevier. This book was released on 2011-09-22 with total page 1501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scallops are among the better known shellfish and are widely distributed throughout the world. They are of great economic importance, support both commercial fisheries and mariculture efforts and occupy a unique niche in the marine environment. Contributions from world leaders in scallop research and culture cover all facets of scallop biology including anatomy, taxonomy, physiology, ecology, larval biology and neurobiology. Chapters are also devoted to diseases and parasites, genetics, population dynamics and the adductor muscle, with extensive reference lists provided for each chapter. Since the publication of the first edition of Scallops: Biology, Ecology and Aquaculture in 1991, commercial interest in scallops has grown globally and this is reflected in the seventeen extensive chapters covering both fisheries and aquaculture for all species of scallops in all countries where they are fished or cultured. The Second Edition is the only comprehensive treatise on the biology of scallops and is the definitive reference source for advanced undergraduate and graduate students, mariculturists, managers and researchers. It is a valuable reference for anyone interested in staying abreast of the latest advances in scallops.* Offers over 30 detailed chapters on the developments and ecology of scallops* Provides chapters on various cultures of scallops in China, Japan, Scandinivia, Eastern North American, Europe, and Eastern North America* Includes details of their reproduction, nervous system and behavior, genetics, disease and parasites, and much more* Complete updated version of the first edition

Download or read book A Report of the 24th Northeast Regional Stock Assessment Workshop written by Loretta O'Brien and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Resource Economics written by and published by . This book was released on 1997 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Status of Fishery Resources Off the Northeastern United States for 1998 written by Stephen H. Clark and published by . This book was released on 1998 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: