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<p>Larval rearing trials for the endangered catfish <i>Horabagrus nigricollaris</i> were conducted over 30&#xa0;day to determine the optimal stocking density and substrate type for improved growth and survival. Five-day-old larvae were stocked at densities of 3, 6, 9, 12 and 15 larvae/L. Growth and survival rates decreased significantly with increasing density, but no significant differences were observed between the 3 and 6 larvae/L groups. Although the highest growth and survival rates were observed at 3 larvae/L, 6 larvae/L was identified as the optimal density, offering a balance between growth and survival under controlled indoor conditions. In the second experiment using the optimal density (6 larvae/L), larvae were reared on four substrates sand, chip stones, waterlogged wood, cobbles and a substrate-free control. Substrate type significantly influenced growth and survival. Waterlogged wood resulted in the highest final length (3.17 ± 0.13&#xa0;cm), weight (1.38 ± 0.04&#xa0;g), specific growth rate (4.88 ± 0.09), and survival (96.29 ± 0.64%), followed by chip stones and cobbles. Sand and the substrate-free control had the lowest performance, with survival rates of 70.7 ± 0.64% and 58.1 ± 0.64%, respectively. The superior outcomes of wood substrates likely reflect their ability to provide shelter, reduce stress, and minimize competition and aggression. These findings emphasize the importance of appropriate stocking density and substrate selection for the conservation-oriented aquaculture of <i>H. nigricollaris.</i></p>

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Optimizing larval rearing strategies for the endangered catfish Horabagrus nigricollaris: Integrating stocking density and substrate preferences

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • C. P. Abhilash,
  • Charan Ravi,
  • K. R. Saikrishnan,
  • Sarath Varghese,
  • TT Ajith Kumar,
  • U. K. Sarkar,
  • V. S. Basheer

摘要

Larval rearing trials for the endangered catfish Horabagrus nigricollaris were conducted over 30 day to determine the optimal stocking density and substrate type for improved growth and survival. Five-day-old larvae were stocked at densities of 3, 6, 9, 12 and 15 larvae/L. Growth and survival rates decreased significantly with increasing density, but no significant differences were observed between the 3 and 6 larvae/L groups. Although the highest growth and survival rates were observed at 3 larvae/L, 6 larvae/L was identified as the optimal density, offering a balance between growth and survival under controlled indoor conditions. In the second experiment using the optimal density (6 larvae/L), larvae were reared on four substrates sand, chip stones, waterlogged wood, cobbles and a substrate-free control. Substrate type significantly influenced growth and survival. Waterlogged wood resulted in the highest final length (3.17 ± 0.13 cm), weight (1.38 ± 0.04 g), specific growth rate (4.88 ± 0.09), and survival (96.29 ± 0.64%), followed by chip stones and cobbles. Sand and the substrate-free control had the lowest performance, with survival rates of 70.7 ± 0.64% and 58.1 ± 0.64%, respectively. The superior outcomes of wood substrates likely reflect their ability to provide shelter, reduce stress, and minimize competition and aggression. These findings emphasize the importance of appropriate stocking density and substrate selection for the conservation-oriented aquaculture of H. nigricollaris.