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- W2164271110 abstract "SUMMARY Updated standardized relative abundance indices are presented for Canadian bluefin tuna fisheries in the Gulf of St. Lawrence (1981-2007) and off Southwest Nova Scotia (1988-2007) based on data from commercial log records. Methods used were as in the 2006 bluefin tuna stock assessment. A step-wise regression was used to determine the most appropriate delta lognormal-binomial model specifications for standardizing both CPUE series. CPUEs in the Gulf of St Lawrence have increased slightly from 1997 to 2003, rapidly increased in 2004 and have remained high. The catch rates in 2007 are the highest in the time series, almost the 3x the series average. The Southwest Nova Scotia series has had a fairly stable trend through the mid- to late 1990s. While 2000 is the lowest value on record, catch rates have been following a slightly increasing trend since then. The 2007 catch rates are close (0.98) to the series average. The spatial distribution of the Canadian fisheries has not changed significantly, but there were anecdotal reports of tuna occurring in areas where they have not been observed in many years (for example, the Baie des Chaleurs in the western Gulf of St. Lawrence). The size composition of the catch in the southern Gulf of St. Lawrence over the past 5-6 years has generally followed a declining trend that has recently stabilized, and is now increasing. The condition (Fulton’s K) of individual fish in the southern Gulf of St. Lawrence has been following a declining trend and is now at the lowest value in the series." @default.
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- W2164271110 date "2007-01-01" @default.
- W2164271110 modified "2023-09-27" @default.
- W2164271110 title "INDICES OF STOCK STATUS OBTAINED FROM THE CANADIAN BLUEFIN TUNA FISHERY" @default.
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