Dietary effects on larval survival and development of three sesarmid crabs

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  • Toyota Kenji
    Marine Biological Station, Sado Center for Ecological Sustainability, Niigata University Department of Biological Sciences, Faculty of Science, Kanagawa University Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science Division of Marine Environmental Studies, Noto Marine Laboratory, Institute of Nature and Environmental Technology, Kanazawa University
  • Ichikawa Takashi
    Department of Ocean and Fisheries Sciences, Faculty of Bioindustry, Tokyo University of Agriculture
  • Suzuki Nobuo
    Division of Marine Environmental Studies, Noto Marine Laboratory, Institute of Nature and Environmental Technology, Kanazawa University
  • Ohira Tsuyoshi
    Department of Biological Sciences, Faculty of Science, Kanagawa University

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<p>Semi-terrestrial brachyuran sesarmid crabs are the most diverse and important faunal components of mangrove forest and temperate coastal communities worldwide. To establish a stable larval rearing method for understanding their larval developmental processes including molecular mechanisms of molting and metamorphosis, we examined the effects of diet on the survival and growth of three sesarmid crabs, Chiromantes haematocheir, Orisarma intermedium, and O. dehaani under larval development. Zoea of each species, immediately after hatching, were reared under different feeding conditions as follows: non-feeding; fed only nutrition-enriched rotifers; fed only Artemia (brine shrimp) nauplii; and fed a combination of both nutrition-enriched rotifers and brine shrimp. Larvae of each species survived almost to megalopa when they were fed both rotifer and brine shrimp, but all C. haematocheir larvae had died by zoeal stage 2 when they were only fed brine shrimp. Chiromantes haematocheir larvae could survive into the megalopa stage when fed only nutrition-enriched rotifer, whereas both O. dehaani and O. intermedium showed 50% or less survival and metamorphosis rates into megalopa. The duration of larval development and survival rates of the three crabs were shorter and higher, respectively, in the mixed feeding group (both rotifer and brine shrimp) than when only fed rotifer or brine shrimp. This study provides baseline knowledge of the interspecific variability in larval survival and duration under different diets for sympatric sesarmid crab species.</p>

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  • Plankton and Benthos Research

    Plankton and Benthos Research 18 (2), 84-92, 2023-05-31

    日本プランクトン学会、日本ベントス学会

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