SUMMARY During a tuna tagging program, conducted on board Dakar baitboats in 1999, two types of tags were used: the conventional “spaghetti” tags and the tags used by BETYP tagging program (ICCAT) from “sport fishing” design. Advantages and disadvantages of each type of tags are presented. Statistical analysis are based on GLM and randomization tests. Return rates, recapture’s locations, growth rates and times at liberty are compared between both tags for three tuna species (yellowfin, skipjack and bigeye). Results conclude to a lower efficiency of BETYP tags. For instance, recapture rate and time at liberty for bigeye as well as growth rate for yellowfin are significative ly lower when one uses BETYP tags. However, there is no significative difference between the two types of tags for these parameters for skipjack. Finally, the implementation of BETYP tags is not well suited to intensive tropical tuna tagging programs, as it is then necessary to tag the greatest possible number of fish during a limited time period. RESUME
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