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Effect of new aeration technology on the bacteriology of shrimp ponds growing Penaeus monodon

DRS at CSIR-National Institute of Oceanography

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Title Effect of new aeration technology on the bacteriology of shrimp ponds growing Penaeus monodon
 
Creator Karekar, S.V.
Sreepada, R.A.
Shirodkar, R.R.
Kulkarni, S.
Kumar, P.
LokaBharathi, P.A.
Bergheim, A.
Vogelsang, C.
 
Subject shrimp culture
pond culture
aeration
bacteriology
aquaculture enterprises
aquaculture development
aquaculture techniques
crustacean culture
Penaeus monodon
 
Description The present study was conducted to evaluate the effects of a HOBAS aeration technology developed by HOBAS Water Engineering in Norway on shrimp ponds in India. Two ponds (P1 and P2) having an area of approx. 0.6 ha located at Alvekodi, coastal Karnataka (India) were chosen for the study: In one of the ponds, (P1), four aerators were placed in each corner to facilitate aeration and water circulation. The aim of the study was to evaluate the changes occurring in different bacterial communities, particularly the disease causing bacteria in response to aeration during the cultivation of tiger shrimp, Penaeus monodon. In HOBAS aerated pond (P1) showed more stable DO levels and the pond sediment was healthier with no visual black sulphur deposits. However, the DO levels (measured at 30 cm above the sediment) were not significantly different (P>0.05) in aerated and control ponds. Further, the bacterial communiiies in both rearing water and sediment in the aerated pond turned to be very similar to the bacterial communities found in the control pond in spite of more than two-fold higher stocking density in the former. No significant differences between bacterial abundance in rearing water and pond sediment was observed (P>0.05). Heterotrophic bacterial counts were in the range of 10 sup(3) to 10 sup(4) ml sup(-1) or g sup(-1) and were higher by 1-2 orders of magnitude than other forms of bacteria. Abundance of nitrifiers and denitrifiers did not vary much in both the ponds. Sulphate reducing bacteria (SRB) were in the range of 10 sup(2) ml sup(-1) or g sup(-1) and the counts reduced in the aerated ponds as the cycle proceeded. Potentially disease causing bacteria such as Vibrio spp., Salmonella sp., Shigella sp., and Staphylococcus sp. etc were within the threshold levels. Luminous Vibrios capable of causing Vibriosis were below detectable levels. From a bacteriology point of view, the new HOBAS aeration technology appeared to be helpful in maintaining a disease free environment while sustaining higher yields with optimum food conversion ratio (FOR) compared to the control pond
 
Date 2008-02-12T04:35:02Z
2008-02-12T04:35:02Z
2006
 
Type Conference Article
 
Identifier Sustain fish. Proceedings of the International Symposium on Improved Sustainability of Fish Production Systems and Appropriate Technologies for Utilization held during 16-18 March, 2005, Cochin, India , eds. Kurup, B.M.; Ravindran, K. 147-155p.
http://drs.nio.org/drs/handle/2264/814
 
Language en
 
Rights Copyright [2006]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher School of Industrial Fisheries, CUSAT, India