Validity of an External Marking Method for Swimming Crab <I>Portunus trituberculatus</I> by Removing or Incising the Abdominal Segment

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  • Minamiura Tatsuya
    Hyogo Association for the Promotion of Productive Seas, Hyogo Prefectural Center for Stock Enhancement

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  • 腹節の切除または切り込みによるガザミへの外部標識法の有効性
  • フクセツ ノ セツジョ マタハ キリコミ ニ ヨル ガザミ エ ノ ガイブ ヒョウシキホウ ノ ユウコウセイ

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Abstract

We examined new external marking methods for swimming crab by removing or incising the abdominal segment using micro scissors. The 6 and 7th abdominal segments were removed from crabs of about 10 mm in total carapace width and for crabs of about 30 mm in total carapace width incised longitudinally from the tip of the tail to the middle of the 6th abdominal segment. Most of crabs exhibited no recovery of the 7th abdominal segment after removal. When a few crabs recovered them, the recovered portion was bent. The 7th abdominal segment was cleaved into two pieces, or the tip of the 7th abdominal segment was split by the incision method. The deformity was formed within a few molts and subsequently remained over 450 days. In addition, we observed no similar deformity in wild crabs. These results suggest that these marking methods are suitable for practical use for mark-recapture surveys for swimming crab. We expect that the incision method is particularly effective, because this method showed no significant difference in survival rates between marked crabs and control crabs.

Journal

  • Aquaculture Science

    Aquaculture Science 60 (1), 127-134, 2012

    Japanese Society for Aquaculture Science

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