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Attracting effect of baits used in trap for swimming crab

꽃게 통발용 미끼의 유인효과

  • Chang, Ho-Young (Marine Science & Production Program, Kunsan National University) ;
  • Koo, Jae-Geun (Food Science & Biotechnology Program, Kunsan National University) ;
  • Lee, Keun-Woo (Food Science & Biotechnology Program, Kunsan National University) ;
  • Cho, Bong-Kon (Marine Science & Production Program, Kunsan National University)
  • 장호영 (군산대학교 해양생산학) ;
  • 구재근 (군산대학교 식품생명공학) ;
  • 이근우 (군산대학교 식품생명공학) ;
  • 조봉곤 (군산대학교 해양생산학)
  • Published : 2007.11.30

Abstract

In order to develop the artificial bait of trap for swimming crabs, the attracting effect was analyzed in the duration time of attracting effect, preference and shape recognition to the bait in the water tank and field experiments. According to the result which investigated the mean entrapped number of swimming crabs into the trap for each bait(mackerel, sardine and anchovy) in water tank experiments, the mean entrapped number was found to be higher in the trap with mackerel(6.9 ind.; 23.0%) than in other traps with sardine(5.2 ind.; 17.3%) and anchovy(3.4 ind.; 11.3%). In addition, the mean entrapped ratios of swimming crabs into the traps for 3 kinds of baits were estimated to be over 80% all in 5 hours after soaked in the water tank. For preference of swimming crabs to 3 kinds of baits, the trap with mackerel(6.9 ind.; 23.0%) was evaluated to be higher than the traps with sardine(2.8 ind.; 9.3%) and anchovy(0.2 ind.; 0.7%). In the field experiments, the mean entrapped number of swimming crabs into the trap with mackerel and sardine were found to be similar as 120 and 118 ind., but the trap with anchovy was only 85 ind.. According to the result which investigated the shape regnition of swimming crabs to the bait used mackerel, divided into 8 pieces, 16 pieces and grinded mass in water tank experiments, the mean entrapped number of swimming crabs into the traps that includes the mackerel divided into several pieces was significantly decreased. Moreover, by the presence of skin of mackerel for bait, there was a great difference in the entrapped number of swimming crabs. Therefore, it was thought that the swimming crab was attracted to the bait and entrapped into the trap would indicate that not only the chemical stimuli such as the attactant, but also the visual stimuli such as the shape recognition to the bait might be closely related.

Keywords

Attracting effect;Bait;Trap;Swimming crab

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