Hatha, A A M; Vivekanandhan, G; Savithamani, K; Lakshmanaperumalsamy, P(Elsevier, November 27, 2001)
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Abstract:
A total of 319 strains of Aeromonas hydrophila were isolated from 536 fish and 278 prawns for a 2-year period. All the
strains were tested for resistance to 15 antibiotics and 100% of the strains was resistant to methicillin and rifampicin followed by
bacitracin and novobiocin (99%). Only 3% of the strains exhibited resistance against chloramphenicol. The multiple antibiotic
resistance (MAR) indexing of A. hydrophila strains showed that all of them originated from high-risk sources
Description:
International Journal of Food Microbiology 76 (2002) 165– 168
Hatha, A A M; Vivekanandhan, A A; Julie Joice, G; Christol(Elsevier, May 28, 2004)
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Abstract:
Motile aeromonads isolated from the intestines of farm-raised freshwater fish such as Catla catla, Labeo rohita and
Ctenopharyngodon idella have been characterized to species level. Morphological and physiological grouping revealed 61%
Aeromonas hydrophila, 30% Aeromonas caviae, 7% Aeromonas sobria and 2% which remained unidentified. Hemolytic
activity was detected mostly in A. hydrophila, while only half of the A. sobria and A. caviae showed this activity. Antibiotic
resistance patterns of the strains revealed that they had acquired a relatively higher resistance to oxytetracycline, amoxycillin,
ampicillin, novobiocin and polymixin-B, implicating possible use of these antibiotics in the aquaculture systems.
Description:
International Journal of Food Microbiology 98 (2005) 131– 134
During last decades there has been a continuous growth of aquaculture industries all over the world and taking into
consideration the spurt in freshwater ornamental fish aquaculture and trade in Kerala, the present study was aimed to assess the
prevalence of various motile Aeromonas spp. in fresh water ornamental fishes and associated carriage water. The extracellular
virulence factors and the antibiogram of the isolates were also elucidated. Various species of motile aeromonads such as Aeromonas
caviae, A. hydrophila, A. jandaei, A. schubertii, A. sobria, A. trota and A. veronii were detected. Aeromonas sobria predominated
both fish and water samples. Extracellular enzymes and toxins produced by motile aeromonds are important elements of bacterial
virulence. The production of extracellular virulence factors - proteases, lipase, DNase and haemolysin by the isolates were studied.
All the isolates from both fish and water samples produced gelatinase and nuclease but the ability to produce lipase, caseinase and
haemolysins was found to vary among isolates from different sources. Among the 15 antibiotics to which the isolates were tested, all
the isolates were found to be sensitive to chloramphenicol, ciprofloxacin and gentamicin and resistant to amoxycillin. Local aquarists
maintain the fish in crowded stressful conditions, which could trigger infections by the obligate/ opportunistic pathogenic members
among motile aeromonads
Description:
International Journal of Aquaculture, 2013, Vol.3, No.17, 92-100
Hatha, A A M; Shubhankar Ghosh; Einar, RingØ2; Deborah Gnana Selvam, A; Mujeeb Rahiman, K M; Naveen, Sathyan; Nifty, John(Sophia, January 22, 2014)
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Abstract:
In the present study we address the issue on gut associated lactic acid bacteria (LAB) isolated from the intestine of
estuarine fish Mugil cephalus using de Man Rogossa and Sharpe (MRS) agar. LAB isolates were identified biochemically and
screened for their ability to inhibit in vitro growth of various fish, shrimp and human pathogens. Most of the LAB isolates displayed
an improved antagonism against fish pathogens compared to shrimp and human pathogens. Selected representative strains displaying
high antibacterial activity were identified using 16S rRNA gene sequence analysis. Of the selected strains Lactobacillus brevis was
the most predominant. Four other species of Lactobacillus, Enterobacter hormaechei and Enterobacter ludwigii were also identified.
It was also observed that even among same species, considerable diversity with respect to substrate utilization persisted. Considering
the euryhaline nature of grey mullet (Mugil cephalus), the LAB isolated from the gut possessed good tolerance to varying salt
concentrations. This finding merits further investigation to evaluate whether the isolated LAB could be used as probiotics in various
fresh and sea water aquaculture
Description:
International Journal of Aquaculture, 2014, Vol.4, No.01
Hatha, A A M; Suresh, T; Srinivasan, D; Lakshmanaperumalsamy, P(Microbes And Enviornments, June 19, 2000)
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Abstract:
The incidence of salmonella and escherichia coli in chicken retail outlets in a residential area of coimbatore, Tamilnadu India was studied with the view that accessories may be a source of cross contamination.Accessories like cages,knives ,chopping boards weighing balance trays and the hands of butcher were examined.A toatal of 14 salmonella as well as 31 E.coli were isolated from different sources. The incidence of E.coli was higher than that of Salmonella.The highest incidence of Salmonella was found in chopping boards and the maximum level of E.Coli was detected in cages.
Description:
Microbes and Enviornments,Vol.15,No.3,173-181,2000
Hatha, A A M; Abhirosh, Chandran; Sherin, Varghese; Mony Sheeja, K(Microbes And Enviornments, 2008)
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Abstract:
A toatal of 81 Escherichia coliisolates belonging to 43 different serotypes including several pathogenic strains such as enterotoxigenic E.coli isolated from a tropical estuary were tested against 12 antibiotics to determine the prevelance of multiple antibiotic resistance, antimicrobial resistance profiles and also to find out high risk source of contamination by MAR indexing.