Influence of the
antibacterial herbs, Solanum trilobatum, Andrographis
paniculata and Psoralea corylifolia on the survival, growth
and bacterial load of Penaeus monodon post larvae
T. Citarasu, K.
Venkatramalingam, M. Micheal Babu, R. Raja Jeya Sekar, M. Petermarian-2003
Aquaculture International, 11(6):
581-595
Abstract:
The indiscriminate use of antibiotics and chemicals
in shrimp hatcheries has led to biomagnification and that in turn could lead
to rejection of a whole consignment. The application of the bioencapsulation
technique as a tool for curative treatment in shrimp larvae was
investigated. Herbs having antibacterial properties such as Solanum
trilobatum, Andrographis paniculata and Psoralea
corylifolia (methanolic extracts) were bioencapsulated in Artemia
and fed to Penaeus monodon post larvae PL 1–25.
The post larvae were reared in a medium inoculated with pathogenic bacteria
such as Pseudomonas aeruginosa, Staphylococcus aureus, Salmonella
typhi and Vibrio sp. Post larvae reared in the non-inoculated
water and fed with non-enriched Artemia exhibited 90% survival,
highest specific growth rate (12.43%) and reduced bacterial load. P.
monodon reared in the bacterial inoculated water and fed with the
non-enriched Artemia exhibited the lowest survival (10–30%),
specific growth rate (8.42–9.1%) and
increased bacterial load (2.86 × 103
to 3.76 × 105
cfu/g). The methanolic extracts of the herbs helped to increase
survival and specific growth rate and reduced bacterial load in the P.
monodon culture system. Among the three herbal extracts, P.
corylifolia enriched Artemia fed post larvae showed the
tendency to higher survival (>50%), growth
rate (11.5 averaged) and low bacterial load (1.12 ×
105 cfu/g).
(Centre for
Biotechnology, Anna University, Chennai 600113, India(e-mail: cittu_in@yahoo.com)