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<p>The marine harpacticoid copepod <i>Paramphiascella fulvofasciata</i> is a promising live feed candidate for aquaculture applications, yet systematic information on its culture requirements remains limited. This study evaluated the independent effects of key environmental parameters and dietary treatments on survival rate (SUR), population density (PD), nauplii production rate (NPR), and developmental time (DT), using a one-factor-at-a-time (OFAT) approach. Each factor, including salinity (15–40 psu), temperature (21–36 °C), pH (6.5–9.0), dissolved oxygen (DO; 1.0–6.0 mg/L), light intensity (100–2000 lux), and photoperiod, was tested independently across a range that encompassed both culture-relevant and physiologically stressful levels. Dietary trials covered seven monospecific microalgal diets (<i>Picochlorum maculatum</i>, <i>Isochrysis</i> <i>galbana</i>, <i>Dunaliella salina</i>, <i>Nannochloropsis oculata</i>, <i>Chlorella marina</i>, <i>Tetraselmis suecica</i>, <i>Thalassiosira</i> <i>weissflogii</i>), a mixed microalgal diet, and seven commercial alternatives (brown seaweed, green seaweed, spirulina, moringa, beetroot, carrot, tomato). The best-performing levels for each parameter individually were 30 psu salinity, 27 to 30 °C temperature, pH 8.0, and 4.0 mg/L DO, with maximum SUR of 92.00 ± 4.00%, PD of 889.44 ± 46.96 ind./L, and NPR of 20.83 ± 0.70 nauplii/female recorded at these respective levels. <i>I. galbana</i> proved the superior microalgal diet; brown seaweed and spirulina showed the greatest potential among commercial alternatives, with SUR exceeding 70%. Light optimization showed 500 lux as the best-performing level for SUR (83.00 ± 10.00%) and 1000 lux for reproduction, with the 10:14 L:D photoperiod yielding the highest PD and NPR. The shortest generation time of 19.0 ± 0.4 days was achieved under the <i>I. galbana</i> diet. Performance declined under physiologically unfavourable conditions, particularly at extreme salinities and temperatures, hypoxic DO (&lt; 2.0 mg/L), high light intensities (&gt; 1500 lux), and extended photoperiods. These findings establish species-specific culture guidelines for <i>P. fulvofasciata</i> and highlight the practical potential of marine-origin commercial diets as cost-effective alternatives to live microalgae in larviculture operations.</p>

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Influence of culture conditions and dietary regimes on survival, population dynamics and naupliar production of the copepod Paramphiascella fulvofasciata (Rosenfield & Coull, 1974)

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Palani Sridhar,
  • Mohammed Syed Marjuk,
  • T. D. Babu,
  • Thirunavukkarasu Muralisankar,
  • Perumal Santhanam,
  • Pachiappan Perumal

摘要

The marine harpacticoid copepod Paramphiascella fulvofasciata is a promising live feed candidate for aquaculture applications, yet systematic information on its culture requirements remains limited. This study evaluated the independent effects of key environmental parameters and dietary treatments on survival rate (SUR), population density (PD), nauplii production rate (NPR), and developmental time (DT), using a one-factor-at-a-time (OFAT) approach. Each factor, including salinity (15–40 psu), temperature (21–36 °C), pH (6.5–9.0), dissolved oxygen (DO; 1.0–6.0 mg/L), light intensity (100–2000 lux), and photoperiod, was tested independently across a range that encompassed both culture-relevant and physiologically stressful levels. Dietary trials covered seven monospecific microalgal diets (Picochlorum maculatum, Isochrysis galbana, Dunaliella salina, Nannochloropsis oculata, Chlorella marina, Tetraselmis suecica, Thalassiosira weissflogii), a mixed microalgal diet, and seven commercial alternatives (brown seaweed, green seaweed, spirulina, moringa, beetroot, carrot, tomato). The best-performing levels for each parameter individually were 30 psu salinity, 27 to 30 °C temperature, pH 8.0, and 4.0 mg/L DO, with maximum SUR of 92.00 ± 4.00%, PD of 889.44 ± 46.96 ind./L, and NPR of 20.83 ± 0.70 nauplii/female recorded at these respective levels. I. galbana proved the superior microalgal diet; brown seaweed and spirulina showed the greatest potential among commercial alternatives, with SUR exceeding 70%. Light optimization showed 500 lux as the best-performing level for SUR (83.00 ± 10.00%) and 1000 lux for reproduction, with the 10:14 L:D photoperiod yielding the highest PD and NPR. The shortest generation time of 19.0 ± 0.4 days was achieved under the I. galbana diet. Performance declined under physiologically unfavourable conditions, particularly at extreme salinities and temperatures, hypoxic DO (< 2.0 mg/L), high light intensities (> 1500 lux), and extended photoperiods. These findings establish species-specific culture guidelines for P. fulvofasciata and highlight the practical potential of marine-origin commercial diets as cost-effective alternatives to live microalgae in larviculture operations.