Download or read book Herring in Divisions 6 a 7 b and 7 c written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this study was to assess the identity of herring stocks in ICES Divisions 6.a, 7.b and 7.c, through genetic analysis, in order to develop genetic profiles of the northern (ICES Division 6.a North) and southern (ICES Divisions 6.a South, 7.b and 7.c) stocks, which could be used to discriminate the two stocks during times of mixing, such as, in the summer acoustic surveys. In addition, body and otolith morphometric methods were developed to test if morphometric methods were also able to discriminate the stocks in these areas. The study comprised an extensive review of the history of the existing stock delineations, comprehensive sampling for both the genetic and morphometric components of the project, genetic marker development, genetic screening of samples, the establishment of a genetic protocol for large scale sample screening, morphometric analyses and comparative analyses of both methods. Baseline spawning samples were collected over five spawning seasons (2014-2019) and archive samples from the WESTHER project (2003-2004) were also reanalysed. In total c.4,900 individuals from Divisions 6.a, 7.b and 7.c, 1,860 individuals from outgroup populations, 650 individuals from the WESTHER samples and 3,665 individuals from the MSHAS samples were analysed as part of the genetic analysis tasks. A total of 1,815 baseline spawning individuals from Division 6.a were analysed for the morphometric component of the project and data from more than 10,000 individuals from the MSHAS samples were collected. The genetic analyses indicated that herring in ICES Division 6.a comprise at least three distinct populations; 6.a.S herring, 6.a.N autumn spawning herring and 6.a.N spring spawning herring. The 6.a.S herring are primarily a winter spawning population though there is a later spawning component present in the area also. These components are currently inseparable and for the purposes of stock assessment should be combined as 6.a.S herring. No baseline spawning samples could be collected in Divisions 7.b or 7.c therefore the relationship between the herring that spawn in this area and those that spawn in 6.a.S is unknown. Non-spawning herring caught in Division 7.b assigned genetically to the 6.a.S population. There is no historical or contemporary evidence to support the differentiation of 6.a.N autumn spawning herring and North Sea autumn spawning herring. The term 'west of Scotland herring' originally referred to populations of spring spawning herring that spawned in the Minch area. It now refers to autumn spawning herring that occur west of the 4°W boundary during the period of the MSHAS. The Celtic Sea herring and Irish Sea herring are distinct from each other and from the populations in ICES Divisions 6.a however the current genetic marker panel is not optimised for their inclusion in the baseline assignment dataset. This is not considered to be a significant issue as there is no robust evidence that Irish Sea herring are found in large abundance west of the Hebrides during summer. Historical evidence does suggest that they may be found in the Clyde area at this time before returning to spawn in the Irish Sea in autumn. The morphometric methods used in the current study indicated significant differences between the 6.a.S herring and the 6.a.N autumn spawning herring, however they did not show sufficient power to discriminate mixed survey catches in ICES Division 6.a. The genetic markers and assignment methods presented in the current study constitute a tool that can be used for the assignment of herring caught in mixed survey and commercial catches in Division 6.a into their population of origin with a high level of accuracy (>90%). This approach should be used for regular monitoring of MSHAS and commercial catches of herring in this area and further efforts should be made to expand the genetic screening to the North Sea also.

Download or read book Global fisheries catches can be increased after rebuilding of fish populations written by Henrik Sparholt and published by Nordic Council of Ministers. This book was released on 2019-05-20 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global fisheries catches can be increased in a sustainable way after rebuilding of fish populations, if ecosystem functioning is considered. A central biological reference point for fisheries management, Fmsy, the fishing pressure that gives the maximum sustainable yield, has been re-evaluated taking into account ecosystem functioning. This has been done for the main commercial fish stocks of the Northeast Atlantic. The new Fmsy values can replace the current values right away in fisheries management. Report of the working group meeting in 2017.

Download or read book Palmer s Index to the Times Newspaper written by and published by . This book was released on 1885 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the period from 1790 to 1905 in The Times of London.

Download or read book The Oxford Magazine written by and published by . This book was released on 1913 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compendious Abstract of Public General Acts written by Great Britain and published by . This book was released on 1868 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The New York City Directory for written by and published by . This book was released on 1851 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rand McNally Co s New Imperial Atlas of the World written by Rand McNally and Company and published by . This book was released on 1909 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Doggett s New York City Directory written by and published by . This book was released on 1843 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Doggett s New York City Directory for written by and published by . This book was released on 1845 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Early Life History of Fish written by J.H.S. Blaxter and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plans for an International Symposium on the Early Life History of Fish were first discussed in 1967 at the F. A. O. Advisory Committee on Marine Resources Research {A. C. M. R. R. }. It was considered that studies on fish eggs and larvae were of value in estimating the size of fish stocks, in appraising the stock-recruitment relationship, and in helping to answer questions on the systematics and taxonomy of fish. An A. C. M. R. R. Working Party recommended in 1969 that a Symposium should be held and after discussion with the International Associa tion of Biological Oceanography {I. A. B. O. } Dr. J. H. S. Blaxter of the Scottish Marine Biological Association {S. M. B. A. } agreed to con vene the meeting with the help of a steering committee. Various in ternational agencies were interested in the meeting and agreed to sponsor it in various ways. These agencies included F. A. O. , I. A. B. O. , the International Council for the Exploration of the Sea {I. C. E. S. } and the Scientific Committee for Oceanic Research {S. C. O. R. }. In the final event F. A. O. supported the meeting by publishing the abstracts beforehand, providing travel funds for participants and publishing a report after the meeting. I. A. B. O. and S. C. O. R. provided travel funds and the Royal Society of London and S. M. B. A.

Download or read book The Statutes of the United Kingdom of Great Britain and Ireland Passed in the 1807 69 written by Great Britain and published by . This book was released on 1868 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interstate Commerce Commission Reports written by United States. Interstate Commerce Commission and published by . This book was released on 1960 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Blount County Alabama Cemeteries Volume 1 written by Robin Sterling and published by Lulu.com. This book was released on 2013 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blount County was carved out of the territory ceded to the State by the Creek Indians following their defeat at the Battle of Horseshoe Bend. The earliest settlers began streaming into the former wilderness as early as 1817. Blount was originally a large county, but over the decades pieces were taken to make up other adjoining counties such as Jefferson, Marshall, Etowah, and Cullman. Every cemetery within the contemporary boundaries of Blount was visited by the author and each readable tombstone was copied to develop the contents of this three volume series. Most of the cemeteries were read in 2002. Volume 1 covers alphabetically A through H, beginning with the Alldredge Family Cemetery and concluding with the High Rock Methodist Church Cemetery. This book is vital to any serious student of Blount County genealogy and history.

Download or read book Report of the ICES Advisory Committee on Fishery Management and Advisory Committee on Ecosystems written by ICES Advisory Committee on Fishery Management and published by . This book was released on 2007 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Directory of the City of New York written by and published by . This book was released on 1852 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Heinemann Maths Yr4 Textbook written by Scottish Primary Mathematics Group and published by Heinemann. This book was released on 2001 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ideal resource to stimulate your pupils' numerical thinking. A child-friendly textbook which reinforces fluency in number facts and provides problem-solving activities.

Download or read book Assembly Bill written by California. Legislature. Assembly and published by . This book was released on 1987 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt: