A contribution to the biology of Thunnus Thynnus (Linnaeus, 1758), in Conception Bay, Newfoundland

Butler, Michael J. A. (1969) A contribution to the biology of Thunnus Thynnus (Linnaeus, 1758), in Conception Bay, Newfoundland. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (10MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

This thesis was based on the results of a two year study of the Bluefin tuna of Conception Bay. The program was inaugurated in 1965 under the auspices of the Department of Biology, Memorial University of Newfoundland. -- The Bluefin was considered in terms of its morphology, taxonomy, and meristic characteristics, the latter in comparison with other areas of the Atlantic and Pacific. -- The life history of the western Atlantic Bluefin was described in relation to its distribution, feeding migration, schooling behavior and reproduction. The importance of a comprehensive tagging program was emphasized. Erythrocyte analysis was suggested as a means of sex determination. The age, length and weight inter-relationships were computed for 11, 12 and 13 year old Bluefin, the age groups predominantly present in Newfoundland waters. Stomach contents were analysed quantitatively and qualitatively. Related studies included the analysis of stomach parasites and the determination of the major feeding period(s). The hydrographic and meteorological conditions prevalent during the fishing season were considered in relation to bluefin behavior, distribution and catch success. Methods were suggested to predict the time of arrival of the Bluefin in conception Bay and the total annual catch. A log-sheet was prepared specifically for the bluefin sport-fishery of Conception Bay, to satisfy both biological and commercial requirements.

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