Abstract
A study of the hooked rates of tuna species in relation to live and frozen bait, and frozen baits of different species was made. Most cases showed slight differences in the hooked rate and very few cases were significantly different. As a result it was not possible to state that there is no food preference among tunas and that it does not have any influence on the hooked rate. However, the variability of tuna catches made with the longline gear is so very large that the effect of the bait preference shown by tunas on the catch may be relatively negligible. Cost and availability of bait species appears to be the aspect to be considered in choosing effective tuna longline bait for commercial or even exploratory purposes.
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