Water quality and bacteriology in an aquaculture facility equipped with a new aeration system

Abstract

The HOBAS aeration system was tested to compare changes in environmental and bacteriological parameters in ponds growing Penaeus monodon during a single production cycle. The stocking density in the aerated pond was doubled to 12 post-larvae (PL) m(-2) in contrast to the non-aerated pond with 6 (PL) m(-2). Microbial abundance in the ponds ranged between 10(5-6) cells ml(-1). Among the physiological groups of bacteria enumerated, the heterotrophs dominated with an abundance of 10(4) CFU ml(-1). Of the nitrogen and sulfur cycle bacteria, the nitrifiers flourished in the aerated pond and could maintain ammonia-N concentration within permissible levels. Bacterial activity also maintained sulfide concentrations at < 0.03 mg l(-1). Non-aerated conditions promoted denitrification maintaining nitrate concentration between 0.32 and 0.98 microM NO(3)(-)-N l(-1). However, a marked increase in ammonium content was observed in the non-aerated pond at the end of the culture period. Thus in high-density ponds, the aerators served to stimulate bacterial growth and activity which consequently maintained the quality of the water to match that of low-density ponds. Accordingly, these aerators could be effectively used to sustain higher yields. The effluent from the aerated pond is less likely to alter the redox balance of the receiving waters.

The Use of Cyanobacteria &lt;i&gt;Arthrospira platensis&lt;/i&gt; and Cladoceran &lt;i&gt;Daphnia magna&lt;/i&gt; as Complementary Protein and Lipid Sources in Transitional Diet for Common Carp (&lt;i&gt;Cyprinus carpio&lt;/i&gt; L.) Nursery

“…As expected, the microbiological parameters of the culture water during the experimental period were within acceptable limit in aquatic environment, which ranged between 10 5 to 10 6 for total bacterial count and 10 3 to 10 4 for total Aeromonas count [25]. The results indicated that the risk of infection by either opportunistic or pathogenic bacteria was relatively low.…”

Changes in soil and water quality at sediment–water interface ofPenaeus vannameiculture pond at varying salinities

“…The concentration of NH 4 + ‐N at interface is influenced and controlled by redox potential and biological effects of sediment (Steinber & Hondzo, ) and the concentration of NO 2 ‐N content varies with TAN content. Sulphide concentration increased with days of culture (Fernandes et al, ), and it ranged from 0.004 to 0.089 ppm at the end of culture. A similar trend was observed by Suplee and Cotner (), showing increasing sulphate reduction rates with growing sulphate reducing bacteria abundance as the culture progresses.…”

“…A similar trend was observed at different salinities and no difference was found due to seasonal changes in the same stocking density. There are variations in the TAN and NO 2 ‐N concentration between surface and SWI, but the levels are always within the permissible limits, which clearly suggest that the bacterial processes (oxidation & reduction) and dynamic cycling are responsible for the same (Fernandes et al, ).…”

Microbial community of Pacific abalone (Haliotis discus hannai) juveniles during a disease outbreak in South China

“…; Cai, Han, Song, Li & Zhou ; Cheng, Huang, Shi, Thompson, Mackey & Cai ; Zhou & Cai ). The heterotrophic bacteria in aquaculture water are generally detected at concentrations of up to 10 4 CFUs mL −1 (Fernandes, Kulkarni, Shirodkar, Karekar, Kumar, Sreepada, Vogelsang & Bharathi ; de Paiva‐Maia, Alves‐Modesto, Otavio‐Brito, Olivera & Vasconcelos‐Gesteira ), while the concentration of pathogenic bacteria in seawater might be lower. The epizootic disease is a process associated with displacement of some community members as others become more prevalent.…”