Effect of Salinity Fluctuation Frequency on Molting Rate and Growth Performance of Postlarval White-Leg Shrimp (Litopenaeus vannamei)

Received: 03-01-2018

Accepted: 17-08-2018

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Issue: Vol. 16 No. 5 (2018)

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CHĂN NUÔI – THÚ Y – THỦY SẢN

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Toi, H., & Van, N. (2024). Effect of Salinity Fluctuation Frequency on Molting Rate and Growth Performance of Postlarval White-Leg Shrimp (Litopenaeus vannamei). Vietnam Journal of Agricultural Sciences, 16(5), 425–432. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/458

Effect of Salinity Fluctuation Frequency on Molting Rate and Growth Performance of Postlarval White-Leg Shrimp (Litopenaeus vannamei)

Huynh Thanh Toi (*) 1, 2 , Nguyen Thi Hong Van 3

  • 1 Trường Thủy sản, Đại học Cần Thơ
  • 2 Khoa Thủy sản, Trường đại học Cần Thơ
  • 3 Khoa Thủy sản, Đại học Cần Thơ

    • Keywords

    White-leg shrimp, Litopenaeus vannamei, salinity fluctuation frequency

    Abstract


    This study was conducted to examine the effect of salinity fluctuation frequency on molting rate and growth of postlarval white-leg shrimp (Litopenaeus vannamei). Individal shrimp was stocked in 5 L plastic bottle containing 2 L of 20 ‰ seawater with 04 treatments including salinity fluctuation in an amplitude ± 0‰ (NT1; ĐC), and an amplitude ± 5‰ with a frequency was set in 2 days (NT2), 4 days (NT3) and 6 days (TN4), 30 replicates each. The initial weight and length of postlarva was 0.007 g/ind. and 0.97 cm/ind., respectively. The results showed that the shorter molting frequency (4.9 days/times) and higher molting rate (22.1 %/day) were obtained in the treatment (NT4) where salinity fluctuation frequency was set in 6 days. In contrast, longer molting frequency (5.3 days/times) and lower molting rate (20.5 %/day) was obtained in the constant salinity treatment (ĐC). In addition, the highest growth in terms of weight after 45 days culture were obtained in NT4 (0.88 g/ind.), followed by NT3 (0.85 g/ind.), NT1 (0.83 g/ind.), and NT2 (0.74 g/ind.). The results of this study indicated that the higher molting rate and shorter molting frequency lead to significantly better growth of shrimps when salinity fluctuation in 6 days frequency was applied, compared to constant salinity.

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