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<p>This study examines the role of crabs as potential predators of hatchery-reared spotted halibut <i>Verasper variegatus</i> juveniles in Matsukawa-ura Lagoon, a shallow brackish lagoon in Japan and a key release site for this species. Monthly trap surveys conducted from 2012 to 2014 at 12 locations within and around the lagoon captured 3768 individuals representing 36 species, including 10 potential predator species. The shore swimming crab <i>Charybdis japonica</i> and Japanese mitten crab <i>Eriocheir japonica</i> were the most abundant crab species, accounting for 54.9% and 7.9% of the total catch, respectively. Their seasonal and spatial distributions overlapped with the halibut release period (mainly May–July) and locations, suggesting predation risk. Catch numbers for the two crab species and the white-spotted conger <i>Conger myriaster</i>, the third most abundant predator, showed statistically significant positive correlations with water temperature (peaking in August), indicating that delayed release timing would increase predation risk. Aquarium experiments confirmed that both crab species preyed on live spotted halibut juveniles measuring 69–81&#xa0;mm in total length. These findings suggest that evaluating predator abundance and predation risk, particularly from crabs, is important for improving release strategies and enhancing the post-release survival of spotted halibut juveniles.</p>

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Predation risk by crab species on hatchery-reared spotted halibut juveniles around a brackish lagoon

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Junichi Takagi,
  • Yushi Arai,
  • Manabu Kume,
  • Kotaro Ichikawa,
  • Keiichi Sasaki,
  • Takayuki Itoh,
  • Takashi Iwasaki,
  • Kyoichi Kamiyama,
  • Kazushi Sumino,
  • Kanato Ogiso,
  • Nobuaki Arai,
  • Yoh Yamashita,
  • Hiromichi Mitamura,
  • Toshihiro Wada

摘要

This study examines the role of crabs as potential predators of hatchery-reared spotted halibut Verasper variegatus juveniles in Matsukawa-ura Lagoon, a shallow brackish lagoon in Japan and a key release site for this species. Monthly trap surveys conducted from 2012 to 2014 at 12 locations within and around the lagoon captured 3768 individuals representing 36 species, including 10 potential predator species. The shore swimming crab Charybdis japonica and Japanese mitten crab Eriocheir japonica were the most abundant crab species, accounting for 54.9% and 7.9% of the total catch, respectively. Their seasonal and spatial distributions overlapped with the halibut release period (mainly May–July) and locations, suggesting predation risk. Catch numbers for the two crab species and the white-spotted conger Conger myriaster, the third most abundant predator, showed statistically significant positive correlations with water temperature (peaking in August), indicating that delayed release timing would increase predation risk. Aquarium experiments confirmed that both crab species preyed on live spotted halibut juveniles measuring 69–81 mm in total length. These findings suggest that evaluating predator abundance and predation risk, particularly from crabs, is important for improving release strategies and enhancing the post-release survival of spotted halibut juveniles.