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<p>Artificially reared Japanese eel <i>Anguilla japonica</i> preleptocephali (− 7&#xa0;mm total length, 6–7&#xa0;days post-hatch) were fed picocyanobacteria (<i>Synechococcus</i> sp., strain NIES-976), and their food intake was observed via autofluorescence intensity per area of the mid-hindgut, which was used as an index of gut fullness. Time-course observations revealed that the larvae actively fed under light and dark conditions. Food intake was significantly greater in the low-salinity group (50% seawater) than in the control group (100% seawater). Food intake did not differ significantly under photoperiods of 24-h light versus 24-h dark, indicating a light-independent feeding rhythm. A comparison of larval feeding efficiency under high and low cell densities of picocyanobacteria revealed remarkably high intake of the food material by larvae in the high-density food concentration group, indicating density-dependent food ingestion. This specific feeding ecology whereby Japanese eel larvae can efficiently ingest suspended pico-sized food particles from seawater even in complete darkness may enable them to adapt to oligotrophic environments.</p>

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Influence of environmental factors on the feeding behavior of reared Japanese eel Anguilla japonica preleptocephali given picocyanobacteria

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Yuuya Shioura,
  • Akira Kenzaki,
  • Suguru Okunishi,
  • Tsutomu Tomoda,
  • Hiroto Maeda

摘要

Artificially reared Japanese eel Anguilla japonica preleptocephali (− 7 mm total length, 6–7 days post-hatch) were fed picocyanobacteria (Synechococcus sp., strain NIES-976), and their food intake was observed via autofluorescence intensity per area of the mid-hindgut, which was used as an index of gut fullness. Time-course observations revealed that the larvae actively fed under light and dark conditions. Food intake was significantly greater in the low-salinity group (50% seawater) than in the control group (100% seawater). Food intake did not differ significantly under photoperiods of 24-h light versus 24-h dark, indicating a light-independent feeding rhythm. A comparison of larval feeding efficiency under high and low cell densities of picocyanobacteria revealed remarkably high intake of the food material by larvae in the high-density food concentration group, indicating density-dependent food ingestion. This specific feeding ecology whereby Japanese eel larvae can efficiently ingest suspended pico-sized food particles from seawater even in complete darkness may enable them to adapt to oligotrophic environments.