Diel Self-feeding Rhythms of the Sevenband Grouper <I>Epinephelus septemfasciatus</I>

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Other Title
  • マハタの自発摂餌リズムの日周期性について
  • Diel Self-feeding Rhythms of the Sevenband Grouper Epinephelus septemfasciatus

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Abstract

Daily self-feeding rhythms of the sevenband grouper were investigated under two rearing conditions, indoor tanks (0- and 1-year-old fish) and an outdoor net-pen (2-year-old fish). The fishes in the indoor tanks showed diurnal feeding pattern synchronizing with the given photoperiod with feeding peaks at artificial dawn and/or dusk. More specifically, the ratio of feeding activities during the light phase was greater in 0-year-old fish than in 1-year-old fish on the one hand and that during the crepuscular phase was greater in 1-year-old on the other. The fishes in the net-pen showed crepuscular plus diurnal feeding activities with two feeding peaks corresponding to natural dawn and dusk, respectively. Thus, a clear association between the most active time of feeding and the period of the significant change in light intensity was observed from both rearing conditions. In addition, the feeding activity of 1-year and 2-year-old sevenband grouper decreased when the water temperature was over 25°C. Therefore, the water temperature over 25°C was not appropriate for rearing sevenband grouper.

Journal

  • Aquaculture Science

    Aquaculture Science 62 (1), 13-22, 2014

    Japanese Society for Aquaculture Science

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