Dietary effects of phytoplankton and zooplankton on larval survival, duration and growth of four Caridina species (Decapoda: Caridea: Atyidae) under laboratory conditions

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  • Hamasaki Katsuyuki
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Nishimoto Sota
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Okada Masakazu
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Kimura Asahi
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Otsubo Kosei
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Dan Shigeki
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology

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  • Dietary effects of phytoplankton and zooplankton on larval survival, duration and growth of four <i>Caridina</i> species (Decapoda: Caridea: Atyidae) under laboratory conditions

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<p>We conducted laboratory experiments to evaluate the dietary effects of phytoplankton and zooplankton on larval survival, duration and growth of four amphidromous atyid shrimps, Caridina leucosticta, C. multidentata, C. serratirostris, and C. typus. Larvae were reared by being fed commercially preserved or cultured phytoplankton Tetraselmis sp. and cultured zooplankton rotifers. Larvae survived to juveniles by being fed cultured phytoplankton and rotifers; however, C. serratirostris larvae died due to being trapped to the surface tension of the water during moulting. Rotifers significantly improved larval survival and development, particularly in C. multidentata and C. typus. C. leucosticta larvae moulted to juveniles with high survival rates by being fed only cultured phytoplankton, suggesting that they may develop in eutrophic brackish environments with substantial phytoplankton biomass. C. multidentata larvae had prolonged larval durations under limited nutritional conditions, suggesting their ability to broadly disperse in the sea. C. typus had a longer larval duration than C. leucosticta. Thus, Caridina species might exhibit different larval dispersal strategies in the sea. Larval duration varied, but body size did not vary among the species under the different feeding conditions, indicating that larvae moulted to juveniles after reaching the threshold size of each species needed to migrate to their adult freshwater habitat.</p>

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