Spatial and temporal changes of nitrifying bacterial populations in fish ponds of differing management practices

Publisher Website
Google Scholar
Abstract
Practices of three types of fish farming (polyculture, monoculture and traditional) resulted in density differences of ammonia oxidizers which occurred in maximal numbers in polyculture and minimal in traditional systems. This distribution pattern was attributed to their nutrient status. The sine and cosine waves of periodic functions were a good fit with the seasonal data showing a sharp peak in winter. The correlation studies revealed that seasonal changes of ammonia oxidizers of these fish ponds were largely dependent upon pH, concentrations of different forms of nitrogen, phosphate, dissolved oxygen, organic carbon and organic matter as well as the ratio of C to N.