SUMMARY

The yearly CPUE of bigeye tuna (BET) and yellowfin tuna (YFT) caught by Brazilian tuna longliners in the Atlantic Ocean, from 1978 to 2005, was standardized, based on set-by-set data from 63,973 longline sets. Since the percentage of zero catches was relatively high for both species (35 % for YFT and 47% for BET), a delta log-normal GLM model was used, including the following factors: year (28), month (12), area (4), local depth of the longline set, fishing boat length overall (3) and target species (6). Standardized as well as nominal yearly CPUE for both species showed strong inter-annual oscillation, particularly in the middle of the observed period, with a declining trend in recent years. RÉSUMÉ La CPUE annuelle du thon obèse (BET) et de l’albacore (YFT) capturés par les palangriers thonier