Structure and Artificial Baits for Cage Traps to Capture Freshwater Palaemonid Shrimps

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  • NAKATA Kazuyoshi
    Chair of Marine Biology and Biodiversity, Graduate School of Fisheries Sciences, Hokkaido University
  • WADA Nobuhiro
    Department of Applied Aquabiology, National Fisheries University
  • ARAKI Akira
    Department of Applied Aquabiology, National Fisheries University
  • HAMANO Tatsuo
    Department of Applied Aquabiology, National Fisheries University

Bibliographic Information

Other Title
  • テナガエビ類の採集に用いるエビ篭の構造と使用人工餌料
  • テナガエビ類の採集に用いるエビ籠の構造と使用人工餌料
  • テナガエビルイ ノ サイシュウ ニ モチイル エビカゴ ノ コウゾウ ト シヨウ ジンコウ ジリョウ

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Abstract

Structure and artificial baits for shrimp cage traps were studied to develop an effective method to capture freshwater palaemonid shrimps. We examined the effect of (i) artificial weed as shelter within the trap, (ii) the entrance diameter of the trap, and (iii) artificial baits that were developed as useful baits for a crab cage trap in a previous study on the capture efficiency of the shrimp trap. The artificial weed within the shrimp trap had no effect to increase the number of the palaemonid shrimps captured per trap, but the difference of the entrance diameter of the shrimp trap affected the total catch. The capture efficiency of palaemonid shrimps was higher in the shrimp traps with the entrance diameter of 40mm and 50mm compared with 31mm and the crab cage trap. An appropriate diameter of the shrimp trap was considered to be 40mm in terms of preventing the capture of Japanese mitten crab (Eriocheir japonica), which may cause decreases of the catches of the palaemonid shrimps as the crab often damages the shrimp trap. Both artificial bait 1 (formula feed used for eel culture; 100g) and bait 2 (bait 1 (80g) + both diet coated with squid entrail extract (20g) and krill extract (20g) ) were considered to be useful for the trap of the palaemonid shrimps and to be as effective as frozen saury (Cololabis saira) . To efficiently capture palaemonid shrimps we should use the shrimp trap with an entrance diameter of 40mm using bait 1 that is cheaper than bait 2. The results of field experiments at eight rivers, three lakes and one marsh demonstrated that the shrimp trap with the entrance size of 40mm and bait 1 can be effective to capture not only the palaemonid shrimps but other freshwater shrimps and crayfish.

Journal

  • Aquaculture Science

    Aquaculture Science 53 (3), 263-274, 2005

    Japanese Society for Aquaculture Science

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