Effects of culture conditions on feeding response of larval Pacific red snapper ( Lutjanus peru, Nichols & Murphy) at first feeding

Authors

  • Iram Zavala-Leal,

    1. Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, Mexico
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  • Silvie Dumas,

    Corresponding author
    • Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, Mexico
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  • Renato Peña,

    1. Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, Mexico
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  • Mauricio Contreras-Olguín,

    1. Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, Mexico
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  • Dora Hernández-Ceballos

    1. Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, Mexico
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Correspondence: S Dumas, Centro Interdisciplinario de Ciencias Marinas-Instituto Politécnico Nacional (CICIMAR-IPN), Av. Instituto Politécnico Nacional, La Paz, B.C.S. 23096, Mexico. E-mail: silviedumas@hotmail.com

Abstract

Feeding incidence or number of larvae with preys (FIC) and intensity or number of prey per larvae (FIT) at first feeding of Pacific red snapper ( Lutjanus peru) larvae was investigated under different conditions: prey type (rotifer and copepod nauplius) and density, nauplii size, light intensity, water temperature, salinity and microalgae concentration. Rotifers were not consumed at any prey density and FIC increased significantly when a high nauplii density (10 > 1, 0.1 mL−1) and light intensity (2000 > 1000, 500, 0 lx) were supplied. In a multifactorial experiment where light intensity (2000, 2500, 3000 lx), tank colour (grey and black) and prey type (nauplii and a mixed diet: rotifers and nauplii) were tested, a significant difference was found only for light intensity and prey type with a significant interaction between these factors. FIC was significantly higher with nauplii stage I–III than IV–VI and also at 25 °C than at 28 °C. Green water (0, 0.3 × 106 or 1 × 106 cells mL−1) and salinity (25, 30, 35 gL−1) did not affect FIC. FIT was not affected by any variables tested except in the density experiment where it was significantly higher at 10 nauplii mL−1.

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