| Autor: |
Naqvi, Ajaz Ahmad, Adhikari, Subhendu, Pillai, Bindu R., Sarangi, Niranjan |
| Předmět: |
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| Zdroj: |
Aquaculture Research; Jun2007, Vol. 38 Issue 8, p847-851, 5p, 2 Charts |
| Abstrakt: |
Survival rate, growth and feed intake were determined for late juveniles (4.31 ± 0.18 g) of river prawn Macrobrachium rosenbergii in freshwater with total ammonia-N (NH3-N+NH4-N) concentrations of 0.015 (control), 0.5, 1.0 and 1.5 mg L−1 for 60 days at pH 7.53 ± 0.04 and temperature 24.0 ± 2.5°C. Survival rate was significantly ( P<0.05) lower (54 ± 4.2–70 ± 5.4%) for total ammonia concentrations from 0.5 to 1.5 mg L−1 [0.0139–0.0419 mg L−1 of unionized ammonia (NH3)]. Growth (0.026–0.030 g day−1 range) of the prawns did not differ for the different NH3 levels but were significantly ( P<0.05) lower compared with control (0.056 g day−1). Feed intake rates also diminished significantly ( P<0.05) from 77.60 ± 2.45% at control (0.015 mg L−1 NH3-N) to 48.69 ± 2.13% at 1.5 mg L−1 NH3-N (0.0419 mg L−1 of unionized NH3). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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