Research of the concentration of ammonia and hydrogensulfide in ponds of penaeus monodon shrimp models on different soils in Ca Mau province

Abstract

     The average ammonia and hydrogensulfide concentration in water of ponds on Sj2M, Sp1Mn are higher than M, Mn soil, and they increased in March, June and September of the crop; correlative with time the Penaeus monodon shrimp raised in the period of 01 and 02 months. The average concentration of hydrogensulfide, ammonia in mud by the bottom of ponds are much higher many times than in the water layer of ponds above; on canals and fields of the Extensive Improvement Farming Model (QCCT), and rice - shrimp model (TL) are higher than and extremely variations in comparison with intensive farming model(TC). High concentration of ammonia and hydrogensulfide may cause low shrimp productivity. The suvive rate of penaeus monodon shrimp in Extensive Improvement Farming Model (QCCT), and rice - shrimp model (TL) is low, about less 20%, whereas in intensive farming model(TC) get more 70%.