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Historical effects of fishing on age...

Siskey, Matthew Ryan.

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Historical effects of fishing on age structure and stock mixing in Northwest Atlantic bluefin tuna.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Historical effects of fishing on age structure and stock mixing in Northwest Atlantic bluefin tuna./
作者:	Siskey, Matthew Ryan.
面頁冊數:	164 p.
附註:	Source: Masters Abstracts International, Volume: 55-02.
Contained By:	Masters Abstracts International55-02(E).
標題:	Aquatic sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1600659
ISBN:	9781339098821

Historical effects of fishing on age structure and stock mixing in Northwest Atlantic bluefin tuna.
Siskey, Matthew Ryan.

Historical effects of fishing on age structure and stock mixing in Northwest Atlantic bluefin tuna. - 164 p.

Source: Masters Abstracts International, Volume: 55-02.

Thesis (M.S.)--University of Maryland, College Park, 2015.

Bluefin tuna support important fisheries in the Northwest Atlantic Ocean, which have declined in yield from intense, size-selective exploitation. Age structure, size-at-age, and stock composition were investigated as principal responses to exploitation, utilizing otolith microstructural and chemical analysis. To evaluate otoliths as ageing structures, annulus formation was compared to temperature-associated oscillations in otolith strontium:calcium. Evaluation of otolith stable isotope measures used in stock composition analyses indicated significant differences in delta18O measurements between laboratories, but not delta13C values. Comparisons of age structure, size-at-age, and stock composition over three periods (1974-1978, 1996-2002, 2009-2014) coinciding with the cycle of exploitation intensity suggest size-selective fishing caused (1) age truncation, where median age declined (14 to 6 years); (2) minor changes in size-at-age; and (3) fluctuating stock composition, with peak mixing in the 1990s (48% eastern stock contribution). Size-specific reductions in fishing mortality could contribute to recovery through more frequent production of strong year-classes.

ISBN: 9781339098821Subjects--Topical Terms:

3174300
Aquatic sciences.

Historical effects of fishing on age structure and stock mixing in Northwest Atlantic bluefin tuna.
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