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Bài báo - Tạp chí
(2015) Trang: 139
Tạp chí: International Fisheries Symposium Towards sustainability, advanced technology and community enhancement
Liên kết:

The effects of nitrite on growth performance of clown knifefish (Chitala chitala) were evaluated in a 90-day experiment with fish body weight 10g-12g. The 96-hour median lethal concentration (96-hour LC50 for nitrite) was 360 mg/L. The experiment was arranged randomly with nitrite (NO2–N) concentrations of 180 mg/L (50% of LC50-96h); 18 mg/L (5% of LC50-96h); 10 mg/L (limited concentration for culture fish) and control. After a 90-day experiment survival rate, daily weight gain, specific growth rate decreased with increasing ambient nitrite concentration from 95±3%; 0.40±0.02g/day; 1.56±0.04 %/day at control to 59±6%; 0.25±0.02g/day; 1.18±0.07%/day at 180 mg/L treatment respectively whereas FCR grew up with increasing of ambient nitrite concentration from 3.88±0.12at control to 4.56±0.11 at 180 mg/L treatment. However, there was no significant difference among fish subjected to 0; 10 and 18 mg/L NO2–N in specific growth rate with 1.56±0.04; 1.52±0.06 and 1.45±0.07%/day respectively. Similarly, the results of survival rate, daily weight gain and FCR from concentrations with 0 and 10 mg/L NO2–N did not show any significant differences. At 10 mg/L treatment, survival rate, daily weight gain and FCR are 92±3 %; 0.38±0.03 g/day; 4.03±0.14 respectively. In some commercial cultured ponds of clown knifefish (fish body weight under 100g - 300g), the NO2–N concentration of water samples was analyzed just to be around 0.5 mg/L.

 

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