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In order to develop the substitutive materials for natural baits of swimming crab pots, the fluorescentcharacteristics of the baits were analyzed, and the preference of fluorescent dyes were investigated by themean entrapped catch number to the pots through the water tank experiments and fishing experiments. Onthe investigation of fluorescent characteristics by the 5 kinds of baits, mackerel, krill, manila clam, pigs fatand chickens head which were used in substitutive baits for test in the UV long wave(365nm) area, itshowed clear blue fluorescence in the skin of mackerel, shell of krill, manila clam and bill of chickens head,and green fluorescence in the mackerels muscle and internals, and yellow fluorescence in the pigs fat andchicken s head. On the investigation of fluorescent characteristics by the bait cages in the UV shortwave(254nm) and long wave(365nm) area, it showed each green, red and blue fluorescence in thecylinderical or hexahedral red plastic bait cages which were painted each green, red and blue fluorescencedyes, but it showed yellowish green flourescence in the cylinderical or hexahedral red plastic bait cagewhich was painted yellow fluorescent dye. On the preference investigation of the fluorescent dyes ofswimming crabs by the 5 kinds of the bait cages which were put the mackerel in the non-fluorescent redplastic cage(RF

Fluorescent characteristics of baits and bait cages for swimming crab Portunus trituberculatus pots