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<p>The study investigated the effects of stocking densities and water flow rates on <i>Litopenaeus vannamei</i> post-larvae (PL) in superintensive pre-nursery systems. A total of 12,960 PL15 (0.55 ± 0.1&#xa0;mg and 9.0 ± 1.0&#xa0;mm) were distributed into 27 experimental units with varying water flow rates (100%, 200%, or 300% h<sup>−1</sup>) and stocking densities (30,000, 60,000, or 90,000 PL m<sup>−3</sup>). Water quality parameters and growth performance were monitored over 20&#xa0;days. Results showed temperature increased at 200% flow rate, irrespective of density. Dissolved oxygen (DO) was significantly higher in the 90<sub>300</sub> treatment compared to the 60<sub>100</sub>, 90<sub>100</sub>, and 90<sub>200</sub> treatments. Total ammonia nitrogen (TAN) was significantly lower in the 30<sub>200</sub>, 60<sub>200</sub>, and 90<sub>200</sub>, while nitrite nitrogen (NO<sub>2</sub><sup>−</sup>-N) was significantly higher in the 30<sub>100</sub>, 60<sub>100</sub>, 60<sub>300</sub>, 90<sub>100</sub>, and 90<sub>300</sub> treatments. There was a notable interaction (<i>p</i>-value = 0.0459) among the factors specifically for the NO<sub>2</sub><sup>−</sup>-N levels. The flow rate factor significantly affected the temperature, DO, TAN, NO<sub>2</sub><sup>−</sup>-N, and alkalinity. On the other hand, individually, stocking density significantly affected NO<sub>2</sub><sup>−</sup>-N, salinity, and pH levels. Treatment 90<sub>100</sub> exhibited a significantly higher (<i>p</i> &lt; 0.05) biomass (19.46 ± 2.64&#xa0;g) compared to the other treatments. Daily growth coefficient was the same (from 1.13% to 1.33%) among treatments 30<sub>100</sub>, 30<sub>200</sub>, 30<sub>300</sub>, 60<sub>100</sub>, 60<sub>200</sub>, 60<sub>300</sub>, and 90<sub>100</sub><sub>.</sub> Final biomass was significantly higher (<i>p</i> &lt; 0.05) in the 90-density treatment. Overall, high-density (90,000 PL m<sup>−3</sup>) rearing of <i>L. vannamei</i> PL is feasible in a clear-water RAS system at a 100% h<sup>−1</sup> flow rate.</p>

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Superintensive pre-nursery for Litopenaeus vannamei (PL15–35) varying stocking densities and water flow rates in clear-water recirculating aquaculture system

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Carlos Roberto Coutinho,
  • Marcelo Eduardo Santana,
  • Marco Shizuo Owatari,
  • Luis Alejandro Vinatea Arana

摘要

The study investigated the effects of stocking densities and water flow rates on Litopenaeus vannamei post-larvae (PL) in superintensive pre-nursery systems. A total of 12,960 PL15 (0.55 ± 0.1 mg and 9.0 ± 1.0 mm) were distributed into 27 experimental units with varying water flow rates (100%, 200%, or 300% h−1) and stocking densities (30,000, 60,000, or 90,000 PL m−3). Water quality parameters and growth performance were monitored over 20 days. Results showed temperature increased at 200% flow rate, irrespective of density. Dissolved oxygen (DO) was significantly higher in the 90300 treatment compared to the 60100, 90100, and 90200 treatments. Total ammonia nitrogen (TAN) was significantly lower in the 30200, 60200, and 90200, while nitrite nitrogen (NO2−-N) was significantly higher in the 30100, 60100, 60300, 90100, and 90300 treatments. There was a notable interaction (p-value = 0.0459) among the factors specifically for the NO2−-N levels. The flow rate factor significantly affected the temperature, DO, TAN, NO2−-N, and alkalinity. On the other hand, individually, stocking density significantly affected NO2−-N, salinity, and pH levels. Treatment 90100 exhibited a significantly higher (p < 0.05) biomass (19.46 ± 2.64 g) compared to the other treatments. Daily growth coefficient was the same (from 1.13% to 1.33%) among treatments 30100, 30200, 30300, 60100, 60200, 60300, and 90100. Final biomass was significantly higher (p < 0.05) in the 90-density treatment. Overall, high-density (90,000 PL m−3) rearing of L. vannamei PL is feasible in a clear-water RAS system at a 100% h−1 flow rate.