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References in periodicals archive ?
Although these causes may explain why northern bluefin tuna distribution or abundance in the Gulf of Maine has changed, they do not account for the apparent decline in quality of those fish remaining in the area.
As a substitute, we used grade data from brokers in the commercial northern bluefin tuna fishery who grade every fish before purchase.
Our analysis identified significant declines in the somatic condition (fat and oil content and fish shape) of northern bluefin tuna in the Gulf of Maine.
Our multinomial regression analysis demonstrated highly significant declines in the fat and oil content and shape of northern bluefin tuna landed in the Gulf of Maine over the last 14 years, corroborating the observations of fishermen.
Seasonal migrations of adult northern bluefin tuna are believed to be bound by reproduction and feeding constraints: spawning in warm (>24[degrees]C) regions in spring and early summer followed by dispersal to continental shelves at higher latitudes for intensive foraging through late fall (Rivas, 1955; Clay, 1991).
The longstanding migration paradigm is that western Atlantic northern bluefin tuna spawn in the Gulf of Mexico and Straits of Florida from April to June and then migrate northward along the continental shelf to New England and Canadian waters (Rivas, 1955; Mather et al.
Given that northern bluefin tuna spend up to five months on the feeding grounds, a decline in somatic condition intuitively points to changes in the forage base and energy transfer within the Gulf of Maine.
A coincident decline in northern bluefin tuna and Atlantic herring condition in the Gulf of St.
If the abundance of forage fish has been reduced, dispersed into smaller schools, or shifted, northern bluefin tuna would have to expend more energy in search of prey, shift their diet to less energetic prey (i.
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