Thong tin chung:

Ngay nh?n bai: 17/05/2018
Ngay nh?n bai s?a: 30/06/2018

Ngay duy?t dang: 30/07/2018

Title:

The influence of the difference rate Apex Aqua on growth and survival of Spotted scat (Scatophagus argus)

T? khoa:

Ca nau, t? l? Apex Aqua, Scatophagus argus

Keywords:

Ratio Apex Aqua, Scatophagus argus, Spotted scat

ABSTRACT

The study determined the effects of the Apex Aqua on growth and survival of spotted scat to find the appropriate rate of Apex Aqua supplements to enhance growth and survival of spotted, scat contributing to improving effective culturing procedures and reducing production costs.. The experiment was designed randomly with four treatments with different ratios of Apex Aqua, including (1) no fertilize, (2) fertilize at the rate of Apex Aqua = 2 g/m³, (3) fertilize at the rate of Apex Aqua = 4 g/m³, (4) fertilize at the rate of Apex Aqua = 6 g/m³. Each treatment, was repeated three times. Spotted scat was 0,15 g in average weight, and was cultured at salinity of 5?; Apex Aqua was supplemented every 3 days. After 45 days of experiment, water factors were suitable for the development of spotted scat. Spotted scat in the treatment of Apex Aqua = 2 g/m³ (the everage weight gain of 1,267 (g), daily weight gain of 0,025 g/day and relative growth rate of 4,613 %/day) showed the highest figures, and difference was statistically significant (p<0,05) compared with the other treatments. The highest survival rates (96.4%) were obtained from the treatment of no fertilize, but difference was not statistically significant (p>0,05) compared with the other treatments. Thus, spotted scat can be cultured with fertilize at the rate of Apex Aqua = 2 g/m³.

TOM T?T

Nghien c?u nh?m xac d?nh ?nh h??ng c?a t? l? Apex Aqua d?n tang tr??ng va t? l? s?ng c?a ca nau gi?ng t? do tim ra t? l? Apex Aqua b? sung thich h?p d? nang cao tang tr??ng va t? l? s?ng c?a ca nau gop ph?n xay d?ng quy trinh ??ng co hi?u qu? va gi?m chi phi khi ??ng. Thi nghi?m d??c b? tri hoan toan ng?u nhien v?i 4 nghi?m th?c bon Apex Aqua v?i li?u l??ng khac nhau, m?i nghi?m th?c d??c l?p l?i 3 l?n: khong b? sung Apex Aqua (d?i ch?ng), b? sung Apex Aqua 2 g/m³, b? sung Apex Aqua 4 g/m³, bon b? sung Apex Aqua 6 g/m³. Ca nau co kh?i l??ng trung binh ban d?u la 0,15 g/con d??c ??ng ? d? m?n 5?, Apex Aqua d??c b? sung 3 ngay/l?n. K?t qu? nghien c?u d? ghi nh?n, sau 45 ngay thi nghi?m, cac y?u t? moi tr??ng n??c d?u n?m trong kho?ng thich h?p cho s? phat tri?n c?a ca nau. Trong do, ca nau ??ng ? nghi?m th?c b? sung Apex Aqua 2 g/m³ tang tr??ng tuy?t d?i 0,025 g/ngay va tang tr??ng t??ng d?i 4,613 %/ngay la cao nh?t va khac bi?t co y ngh?a th?ng ke (p<0,05) so v?i cac nghi?m th?c con l?i. T? l? s?ng ? nghi?m th?c d?i ch?ng la kha cao va khac bi?t khong co y ngh?a th?ng ke (p>0,05) gi?a cac nghi?m th?c. Nh? v?y, co th? ??ng ca nau v?i li?u l??ng b? sung Apex Aqua 2 g/m³.

Trich d?n: Ly Van Khanh, 2018. ?nh h??ng c?a li?u l??ng apex aqua len tang tr??ng va t? l? s?ng trong ??ng gi?ng ca nau (Scatophagus argus). T?p chi Khoa h?c Tr??ng D?i h?c C?n Th?. 54(S? chuyen d?: Th?y s?n)(1): 72-77.