Download or read book An Evaluation of the Current Status of Southern Gulf Herring written by G. H. Winters and published by . This book was released on 1980 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Catches from the southern Gulf of St. Lawrence herring stock complex declined from 52,000 mt in 1978 to 45,900 mt in 1979. This decline can be primarily attributable to the voluntary closure of the "Edge" fishery due to the presence of large quantities of small herring ... these analyses indicate 2+ biomass of this stock-complex has remained relatively stable at about 450,000 mt and that recruitment in most recent years has been improving"--Abstract.
Download or read book Evaluation of Recent Changes in the Population Dynamics of Southern Gulf Herring written by G. H. Winters and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Landings from this stock complex decreased from peak levels of 300,000 m tons in 1970 to a low of 37,200 m tons in 1974. Research studies (Winters and Hodder 1975) have revealed that the precipitous decline in abundance during the 1970's was due to a combination of moderate growth overfishing and successively poor recruitment to both spawning components (spring and fall) following two very large but apparently anomalous year-classes produced in the late 1950's. More recent studies (Winters et al. 1977, Winters 1978) have indicated divergent recruitment patterns in the two spawning components during the last decade, resulting in a shift in predominance towards spring-spawners"--Introduction.
Download or read book Southern Gulf of St Lawrence Herring written by Canada. Department of Fisheries and Oceans. Gulf Fisheries Management Region. Science Branch and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents historical information (landings and total allowable catch) on the spring and fall spawning components of the southern Gulf of St. Lawrence herring fishery. It evaluates the status of each component using a sequential population analysis that combines 2 sources of information: catch-at-age and an abundance index. It also provides an outlook for each component.
Download or read book Analysis of Stock Size and Yield of Southern Gulf Herring written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The rapid increase in landings of Southern Gulf herring in the mid 1960's was due to the large-scale introduction of purse-seining which transformed the fishery from one based mainly on fixed gear exploiting spring-spawning herring in the Southern Gulf to a mobile fishery exploiting both spring-- and fall-spawning herring at ail-times of the year and outside the Gulf in Southwest Newfoundland where the stock complex over-wintered"--Introduction.
Download or read book Analysis of Juvenile Atlantic Herring Catches in the Southern Gulf of St Lawrence September Groundfish Surveys written by Canada. Department of Fisheries and Oceans and published by Moncton, N.B. : Fisheries and Oceans Canada. This book was released on 1997 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Herring in the Southern Gulf of St Lawrence NAFO Div 4T written by Claude LeBlanc and published by . This book was released on 2009 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment Report on Southern Gulf of St Lawrence 4T Herring written by Claude LeBlanc and published by . This book was released on 2006 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment Report on Southern Gulf of St Lawrence 4T Herring written by Canada. Department of Fisheries and Oceans. Gulf Region and published by . This book was released on 2005 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Atlantic Herring in the Southern Gulf of St Lawrence NAFO Div 4T written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southern Gulf of St Lawrence Herring written by and published by . This book was released on 1997 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution of Juvenile Atlantic Herring in the Southern Gulf of St Lawrence written by Canada. Department of Fisheries and Oceans and published by Moncton, N.B. : Fisheries and Oceans Canada. This book was released on 1997 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Separation of Atlantic Herring Clupea Harengus Stocks in the Southern Gulf of St Lawrence Using Digitized Otolith Morphometrics and Discriminant Function Analysis written by S. N. Messieh and published by Dartmouth, N.S. : Fisheries and Oceans, Canada. This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The identification of Atlantic herring stocks inhabiting both sides of the northern Atlantic has been the subject of numerous investigations for many years. In more recent years, the discreteness of the spring and autumn herring populations in the Gulf of St. Lawrence was established, a separation important for delineating proper fishery management units. Otolith characteristics, such as shape and first year's growth, were used in both the Gulf and Newfoundland regions, but the method used requires well-trained technicians and was criticized because of its subjectivity. A semi-automated microcomputer-based measuring system was developed for otolith measurements in the Gulf region to eliminate such subjectivity. The method uses a microscope with a drawing tube and a digitizer interfaced to a personal computer which analyzes the digitized otolith measurements using software packages. This report presents results using this system to separate herring spawning groups by otolith morphometrics.
Download or read book Assessment of Atlantic Herring in the Southern Gulf of St Lawrence NAFO Div 4T to 2013 written by and published by . This book was released on 2014 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Herring in the Southern Gulf of St Lawrence NAFO Div 4T written by Claude LeBlanc and published by . This book was released on 2007 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1985 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Maritimes Regional Advisory Process Meeting on the Assessment Framework for 4T Herring written by and published by . This book was released on 2003 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings review working paper presentations & discussions at a meeting held to review the virtual population analysis (VPA) assessment model for use on the spring & fall herring stocks in the southern Gulf of St. Lawrence. The meeting focussed on the VPA model, and in particular the resolution of the problems encountered in the spring 2002 assessment and the retrospective patterns seen in the fall spawning component. Other topics covered include issues in VPA formulation, data collection requirements, and acoustic indices as part of an alternate decision rule system.
Download or read book Population Modelling Results for the Assessment of Atlantic Herring Clupea Harengus Stocks in the Southern Gulf of St Lawrence NAFO Division 4T to 2015 written by D. P. Swain and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
