Download or read book Aspects of the Ecology of Grey Seals halichoerus Grypus and the Interactions Between Seals and Salmon salmo Salar Fisheries on the West Coast of Ireland written by Peter Coulahan and published by . This book was released on 2000 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2002 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interactions Between Seals and Atlantic Salmon Salmo Salar in Rivers and Estuaries of Newfoundland and Labrador written by Crystal C. Lenky and published by . This book was released on 2007 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts written by and published by . This book was released on 1995-02 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction Between Grey Seal Populations and Fish Species written by and published by . This book was released on 1981 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Interactions Between Grey Seals and Selected Fisheries in Ireland written by Ciarán P. Crummey and published by . This book was released on 2005 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Diet and Foraging Ecology of Gray Seals Halichoerus Grypus in United States Waters written by Kristen Ampela and published by . This book was released on 2009 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feeding Ecology of the Northwest Atlantic Grey Seal Halichoerus Grypus microform written by Donald Benoit and published by National Library of Canada. This book was released on 1989 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Conflict Between Grey Seals Halichoerus Grypus and the Baltic Coastal Fisheries written by Arne Fjälling and published by . This book was released on 2006 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interactions Between Seals and Salmon Drift Net Fisheries in the West of Ireland written by D. McCarthy and published by . This book was released on 1985 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gray Halichoerus Grypus and Harbor Seal Phoca Vitulina Bycatch and Depredation in New England Sink gillnet Fisheries written by Laura N. Sirak and published by . This book was released on 2015 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine mammals interact with commercial fisheries via competition for resources, depredation (feeding on fish caught in gear), entanglement, and bycatch in fishing gear. In New England, gray seals (Halichoerus grypus) and harbor seals (Phoca vitulina) are often taken as bycatch in sink-gillnet fisheries and are believed to depredate fish in gillnets. As seal populations increase, interactions with fisheries are also likely to increase, affecting both seal stocks and the New England fishing industry. This study aims to understand seal bycatch in the New England sink-gillnet fisheries by identifying the spatial and temporal trends in bycatch as well as the characteristics of seals that are taken most frequently as bycatch. Depredation is also a concern in the commercial fishing industry, however, there is some controversy among fishermen and scientists concerning the identification of the species responsible for depredation (e.g. seal vs. spiny dogfish (Squalus acanthias)). Therefore, a protocol for identifying seal and spiny dogfish depredation was developed and used to identify depredation in a small-scale study of the sink-gillnet fishery targeting skate. Data from the Northeast Fisheries Observer Program (NEFOP) from 2005-2013 were analyzed to assess seal bycatch in the Northeast sink-gillnet fishery. Male seals were taken significantly more frequently than females, with young of the year most commonly occurring as bycatch. Areas where seals were taken in New England shifted seasonally, generally following the annual life history of each seal species. Gray seal bycatch showed an increasing trend over the years of study, with highest bycatch occurring in the spring in areas closest to haul out sites: Muskeget and Monomy Island, MA, USA. Harbor seal bycatch was much more variable between years, with highest bycatch occurring in the winter near major harbor seals haul out sites along the southern Maine coast and southeastern Massachusetts. This study was a crucial step to understanding the complexities of seal-fishery interactions in New England. In order to mitigate damage from depredation, it is important to know the source of the damage. Characteristics of seal and spiny dogfish bites were identified using foam imprints from jaws and bites by captive animals in the soft tissue of fish. Measurements from bite imprints and damaged fish were used to develop a protocol for identifying damage in the field. In general, dogfish bites were clean (flesh completely removed), circular in shape, and wider than long (bite ratio (bite length/bite width) 0.6), whereas seal bites were ragged (flesh not completely removed, but partially torn from the bite), retangular or trapezoidal in shape, and usually longer than wide or equal in length and width (bite ratio 0.7). This protocol was used to identify damaged catch observed on a commercial gill-net fishing vessel targeting skate in New England waters June - August 2014. In this small-scale study, dogfish bites were identified as the damage source significantly more frequently than seal bites (Multifactor ANOVA: F [subscript, degree of freedom]=2,66 = 9.306, p=0.0003; Tukey HSD: p
Download or read book Interactions Between Grey Seals and UK Fisheries written by and published by . This book was released on 1984 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grey Seals and Fisheries written by Great Britain. Consultative Committee on Grey Seals and Fisheries and published by . This book was released on 1963 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Biology of Grey Seals halichoerus Grypus Fabricius 1791 in Western Ireland written by Oliver Roger Marieke Kiely and published by . This book was released on 1998 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The population status and biology of grey seals was examined at principal breeding colonies in Ireland. A census of pup production at the Inishkea island group in 1995 and at the Blasket Islands in 1996/97 yielded all-age population estimates of 539-693 and 543-697 animals respectively, which are similar to previous population estimates for this area derived in 1983. Shore abundances were correlated between years and number of seals reached an annual peak during the annual moult. Adult males showed an annual immigration into the Inishkea Group but not to the Blasket Islands. Adult females showed a relatively consistent haul-out patterns through both years of the study. The proportions of males, females and juveniles ashore during the moult season were similar for each study area with males always present in higher numbers. The use of perennial haul-out sites by adult and juvenile grey seals was also examined in a two-year study. A strong effect of season on haul-out abundance was observed for adult females but not for adult males. Complete sex segregation did not occur among adults although a number of sights tended to be used by sex-biased groups. Photographic mark-recapture surveys of grey seals were conducted over a two-year period at three study areas in Ireland and at North Rona in western Scotland. Photo-identification of individual seals using automated pelage matching suggested that seasonal changes in abundance partly resulted from individual changes in site-use. No movements of identified individuals between study areas were detected. Individual recaptures suggested that females may show a level of interannual faithfulness to breeding areas. Population estimates derived from photo-identification data were significantly different from and less reliable than those derived from more traditional census methods.
Download or read book Interactions Between Grey Seals and UK Fisheries written by and published by . This book was released on 1984 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Grey Seal in Eastern Canada written by A. W. Mansfield and published by . This book was released on 1977 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: General biology of Halichoerus grypus based on censuses, marking and collections made in all localities in Maritime Provinces and Quebec where they are known to occur regularly, 1968-70.
Download or read book Cooperative Research Report written by J. W. Ramster and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
