Issued also as thesis, Université de Paris. / Bibliographical foot-notes. "Notice bibliographique": p. [5]-9, Bibliography: p.[11-20].

In this study, spatial and temporal variation in fat content and temporal variation in maturation of North Sea herring were examined. Fulton’s K, a widely used condition index, was proven to be an inconsistent measure of individual herring fat content, whereas relative condition factor is a more accurate measure.  The Distell fish fatmeter was shown to be an accurate measure of individual herring muscle fat content and was used throughout the study. Individual herring biological and fat data were collected during the annual acoustic North Sea herring survey in 2006 – 2007. Analyses of these data showed that immature herring in the northern North Sea were larger and had higher fat contents than those in the south, in 2006.  This spatial gradient may be due to spatial variability in temperature and food abundance. Individual-level analyses using three years of field data demonstrated that North Sea herring must reach a length threshold of approximately 250 mm before the onset of maturation can occur.  However, stock-level analyses using data provided by the ICES herring stock assessment, indicated that maturation of North Sea herring is not affected by density-dependent factors or by mean North Sea surface temperatures.  This study demonstrates that the accuracy of different measures of condition should be tested before being used in research and that spatial and temporal variability in fat content should be considered when conducting studies on fish condition and other life history parameters.

No description available.

No description available.

These (Ph.D.)--Dalhousie University, 2008. / Title from PDF title page. Abstract, table of contents in French and English. Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 88-97). Also issued in print.

Thesis (Ph. D.)--University of Delaware, 1996. / Includes bibliographical references (p. 107-119).

Thesis (doctoral)--Lugduni Batavorum, 1829. / Includes bibliographical references.

Thesis (Ph. D.)--University of Rhode Island, 2004. / Typescript. Includes bibliographical references (leaves 104-106).

Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (leaves [98]-118).

The conflict over the herring run at Kah Shakes is complicated. In 1991, the Alaska Department of Fish and Game (ADFG) expanded the commercial herring sac roe fishing boundary in the Revillagigedo Channel to include Cat and Dog Islands. Native and non-Native local residents of Ketchikan protested the boundary expansion, as did managers of the neighboring Annette Island Fishery managed by the local reservation. Using cultural anthropological research methods that include ethnographic data, semi-structured, qualitative interviews gathered in southeast Alaska in 2008, and a comprehensive literature review of historic data culled from newspapers and other texts, I examine the many political factors that contribute to this conflict, including the contest between anecdotal and scientific data, the construction of fisheries management boundaries, and issues of collective memory. Using Vayda and Walters' event ecology methodology, bolstered by discourse analysis, I identify three discourses (local ecological knowledge, management and environmental). I use these discourses as comparative units to show that little coincident data can be identified between these discourses. I examine two areas of dissident data, stock definition and measures of abundance, and recommend that local ecological knowledge (LEK) be used to expand the scientific database on which current management techniques depend, to question the accuracy of current ADFG management boundaries and stock identification, and to recalibrate guideline harvest levels by exposing the effects of shifting baselines. I then outline how Geographic Information Systems (GIS) may assist in the validation and integration of LEK into the current fisheries management paradigm to create a more holistic narrative of ecological change.