斑节对虾节水型养殖期间虾池硫化物含量的变化特征

在斑节对虾节水型养殖期间,观测了虾池底质和海水中硫化物含量的变化.结果表明,投放有益微生物的试验池与未投放有益微生物的对照池相比,底质硫化物含量波动较小,增高的速度较慢、增幅较小.在养殖后期试验池底质硫化物含量只增高了 68%,而对照池的增高了 252%.养殖过程中海水硫化物浓度呈阶段式和波浪式增高,在试验池中其浓度多数时间比对照池中的低.有益微生物能在一定程度上抑制水体和底质中硫化物的积累,但对老化虾池效果较差.由于节水型养殖模式利用有益微生物分解养殖过程中产生的有机物,采用单细胞藻类吸收利用营养盐,使养殖环境质量得到改善.

Variation characteristics of sulfide content in shrimp ponds during save-water type culture of Penaeus monodon

The dynamic variation of the content of sulfide in the sediment and sea water of shrimp ponds was observed during the save-water type culture of Penaeus monodon. The results indicated that the sulfide content in the sediment of test ponds adding useful microorganisms increased in little range and more slowly with culture time, compared with that in the control pond in which no useful microorganisms was added. At the end of the culture, sulfide content in the sediment of test ponds and that in the control pond increased 68%,252%,respectively. The sulfide concentration in the water increased wavily and stagedly with culture time, the concentration in the test ponds were often lower than that in the control pond. The useful microorganisms might restrain the accumulation of the sulfide in the sediments and waters to some extent in many shrimp ponds except for the degraded shrimp pond. The save-water type culture model applied the useful microorganisms to decompose the organic matter produced in the culture process and made use of the monocellular algae to absorb and utilize the nutrients,so as to improve the culture environment quality.