Effect of Ammonia at Different pH Levels on Penaeus monodon Postlarvae
Abstract:
The effect of ammonia on Penaeus monodon postlarvae (5.7 ± 0.9 mg, 12.0 ± 1.4 mm) varied with pH level. As the postlarvae were exposed to 250 mg•l-1 ammonia-N, the LT50 and LT100 values decreased with pH increases. Postlarvae exposed to 60 mg•l-1 ammonia-N and a pH of 9.10 had less tolerance than those exposed to 250 mg•l-1 ammonia-N and a pH of 8.31. The LT50 value of postlarvae exposed to 0.07 mg•l-1 ammonia-N and pH of 9.10 was less than half of the LT50 value of postlarvae exposed to the same concentration of ammonia-N but a pH of 8.31. Increasing pH level in a given ammonia solution increased the proportion of NH3 and increased the ammonia toxicity on P. monodon postlarvae. Monitoring the ammonia level and preventing an increase of pH are suggested for shrimp culture.
 |
Full text PDF |
Date 1989/06/01
|
Abstract Hits 3044
|
Downloads 2921
|