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<p>This study evaluated the effects of different water temperatures on growth parameters, muscle cellularity and physiological responses of juveniles of tambaqui (<i>Colossoma macropomum</i>) and hybrid tambatinga (♀<i>C. macropomum</i> × ♂<i>Piaractus brachypomus</i>) reared in a recirculating aquaculture system (RAS). A total of 224 juveniles (112 per fish group; initial weight of 1.31 ± 0.39&#xa0;g) were distributed at 0.5 fish L⁻<sup>1</sup> in 16 circular tanks (28 L each), in a completely randomized 2 × 2 factorial design with four replicates following treatment: CT<sub>28</sub>, HT<sub>28</sub>, CT<sub>32</sub>, and HT<sub>32</sub>, corresponding to the two fish group maintained at 28&#xa0;°C or 32&#xa0;°C for 30&#xa0;days. Dissolved oxygen and water pH were lower at 32ºC (<i>P</i> &lt; 0.05). After 15 and 30&#xa0;days, <i>C. macropomum</i> showed greater weight, weight gain, daily weight gain and biomass than the hybrid, regardless of temperature (<i>P</i> &lt; 0.05). Plasma protein showed an interaction effect, with higher values in tambatinga at both temperatures. In the comparison between fish groups, only HT<sub>32</sub> showed values higher than HT<sub>28</sub> (P &lt; 0.05). Hemoglobin concentrations were higher for <i>C. macropomum</i> and 32ºC (<i>P</i> &lt; 0.05). Hepatosomatic and viscerosomatic indices were higher in <i>C. macropomum</i> at 28&#xa0;°C (P &lt; 0.05), while muscle cellularity varied between fish group and temperatures, with hybrid tambatinga presenting larger fiber diameters and 32&#xa0;°C promoting hypertrophy (P &lt; 0.05). Therefore, the temperature of 32&#xa0;°C promoted short-term growth in RAS, particularly in juvenile <i>C. macropomum</i>, and induced genotype-specific physiological and muscular responses. However, considering the short duration of the study, further studies are needed to establish definitive recommendations.</p>

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How do temperatures affect the performance, muscular cellularity and physiological parameters of tambaqui (Colossoma macropomum) and hybrid tambatinga (C. macropomum x Piaractus brachypomus)?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月24日

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  • Sidney dos Santos Silva,
  • Imaculada de Morais Carvalho Ananias,
  • Thamara Bentivole Magalhaes,
  • Wagner Junio de Freitas Martins,
  • André de Sena Souza,
  • Fábio Aremil Costa dos Santos,
  • Suellen Cristina Moreira de Sales,
  • Alessandro Loureiro Paschoalini,
  • Nilo Bazzoli,
  • Gisele Cristina Favero,
  • Ronald Kennedy Luz

摘要

This study evaluated the effects of different water temperatures on growth parameters, muscle cellularity and physiological responses of juveniles of tambaqui (Colossoma macropomum) and hybrid tambatinga (♀C. macropomum × ♂Piaractus brachypomus) reared in a recirculating aquaculture system (RAS). A total of 224 juveniles (112 per fish group; initial weight of 1.31 ± 0.39 g) were distributed at 0.5 fish L⁻1 in 16 circular tanks (28 L each), in a completely randomized 2 × 2 factorial design with four replicates following treatment: CT28, HT28, CT32, and HT32, corresponding to the two fish group maintained at 28 °C or 32 °C for 30 days. Dissolved oxygen and water pH were lower at 32ºC (P < 0.05). After 15 and 30 days, C. macropomum showed greater weight, weight gain, daily weight gain and biomass than the hybrid, regardless of temperature (P < 0.05). Plasma protein showed an interaction effect, with higher values in tambatinga at both temperatures. In the comparison between fish groups, only HT32 showed values higher than HT28 (P < 0.05). Hemoglobin concentrations were higher for C. macropomum and 32ºC (P < 0.05). Hepatosomatic and viscerosomatic indices were higher in C. macropomum at 28 °C (P < 0.05), while muscle cellularity varied between fish group and temperatures, with hybrid tambatinga presenting larger fiber diameters and 32 °C promoting hypertrophy (P < 0.05). Therefore, the temperature of 32 °C promoted short-term growth in RAS, particularly in juvenile C. macropomum, and induced genotype-specific physiological and muscular responses. However, considering the short duration of the study, further studies are needed to establish definitive recommendations.