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Thiruvananthapuram, India

Baijulal B.,Kerala State Biodiversity Board | Sobha V.,Kerala University | Jyothi S.J.,Kerala University | Padmalal D.,Center for Earth Science Studies | Emmanuel J.,St Johns College Anchal
Environmental Monitoring and Assessment

The present paper deals with the distribution of sediment and sediment-bound nutrients in two important coastal lagoons of southern Kerala such as the Ashtamudi Estuarine Lagoon in the Kollam district and the Kadinamkulam Lagoon in the Thiruvananthapuram district. Among the two lagoons, the former is coast perpendicular, and the latter is coast parallel. An analysis of the textural characteristics reveals that, in both lagoons, the estuarine mouth and areas close to it are dominated by sand and sand-rich sediment species, indicating a high-energy depositional regime prevailing the region. On the other hand, the silt and clay dominant arms are almost sheltered and enjoy a low-energy depositional environment. The nutrient and organic carbon contents in the sheltered areas are significantly higher than the most dynamic high-energy estuarine mouth regions. This peculiar behaviour of these coastal water bodies has to be given adequate importance while laying down strategies for the conservation and management of these fragile aquatic systems in the south-western coast of India in particular and tropical coasts of the world in general. © 2013 Springer Science+Business Media Dordrecht. Source

Manju M.,Kerala University | Manju M.,P.A. College | Vijayasree A.S.,Kerala University | Akbarsha M.A.,Bharathidasan University | Oommen O.V.,Kerala State Biodiversity Board
Fish Physiology and Biochemistry

The present study was conducted to evaluate the safety of long-term dietary curcumin at doses 0.5 and 1 % in Anabas testudineus employing hematological and cytological techniques. The fish were fed with curcumin-supplemented feed for 6 months. Fine blood smears were prepared and subjected to three different staining techniques. The erythrocyte micronucleus frequency (MN) and the cytometric measurements of erythrocytes were determined. Blood from the control and treated fish was subjected to the assessment of several hematological parameters. Also, DNA fragmentation assay on hepatocytes was conducted. The results showed that hemoglobin content, RBC count and hematocrit increased in the curcumin-fed fish compared to control, whereas WBC count, platelet count, mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were unaffected. WBC/RBC ratio was lower in the case of curcumin-treated fish. The cytometric measurements revealed no change in the erythrocytes and their nuclei after curcumin treatment. DNA fragmentation assay revealed intact DNA in curcumin-fed group, ruling out the possibility of curcumin-induced DNA damage. The positive control group showed a significant increase in MN frequency compared to negative control and curcumin-fed groups. In fact, the MN frequency decreased in 1 % curcumin-fed group compared to the negative control and 0.5 % curcumin groups. All these indicated a state of well-being of the curcumin-treated fish. Therefore, it is concluded that curcumin could be used as a safe feed ingredient to improve the growth of finfish in aquaculture. © 2013 Springer Science+Business Media Dordrecht. Source

Kotharambath R.,Government College Chittur | Wilkinson M.,Natural History Museum in London | Oommen O.V.,Kerala State Biodiversity Board | Gower D.J.,Natural History Museum in London

A new species of indotyphlid caecilian amphibian, Gegeneophis tejaswini sp. nov., is described based on eight specimens from lowlands of the most northerly district of the state of Kerala in the southern part of the Western Ghats region, India. This species is distinguished from all other Gegeneophis in annulation characters and genetics (> 6% different from most similar nominal species for 883 base pairs of mitochondrial 12S and 16S rRNA gene sequence data). The high degree of morphological similarity of G. krishni, G. mhadeiensis and the new species underlines that, for some Gegeneophis, larger samples and/or new characters will be needed to further advance the taxonomy of this genus. Copyright © 2015 Magnolia Press. Source

Das P.,Kerala University | Dileepkumar R.,Kerala University | Krishnan A.,Kerala University | Nair A.S.,Kerala University | Oommen O.V.,Kerala State Biodiversity Board
Journal of Entomological Research

Antibacterial activity of gastric secretions from an ant, Oecophylla smaragdina was evaluated against three gram positive bacteria: Staphylococcus aureus, Bacillus subtilis, Staphylococcus epidermidis and four gram negative bacteria: Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa, Vibrio cholerae. Excellent antibacterial activity was exhibited against Vibrio cholerae, Bacillus subtilis and Staphylococcus epidermidis. Moderate effects were seen for other pathogens being tested. Source

Midhun S.J.,Central University of Kerala | Arun D.,Central University of Kerala | Edatt L.,Central University of Kerala | Sruthi M.V.,Central University of Kerala | And 5 more authors.
Aquaculture International

Aquaculture is faced with the challenges of the use of synthetic compounds as growth enhancers and the presence of several contaminants in water. These factors severely deteriorate the quality and quantity of aquaculture products. Phytochemicals play a major role by working as antioxidant agents of which curcumin has become the gold standard. Curcumin, from Curcuma longa shows a wide spectrum of biological activities which include anticancerous, antioxidant, anti-inflammatory, antibacterial, antiviral, antifungal, antidiabetic, antistress, hepatoprotective and gastroprotective effects. Curcumin in 0.5 and 1 % doses were given as feed additive to Oreochromis mossambicus for 35 days. After feeding trial, activities of digestive enzymes such as α-amylase, protease and lipase were analysed. There was a significant increase in the activities of α-amylase, protease and lipase with 0.5 and 1 % curcumin supplementation in feed. Real-time quantification of GH in brain, and IGF-1 and IGF-2 genes in muscle revealed that curcumin significantly increased the expression of these genes. This is the first study to report that curcumin supplementation at concentrations of 0.5 and 1 % in the feed improved the activities of digestive enzymes and also modulates the expression of GH in brain and growth factors such as IGF-1 and IGF-2 in muscle of O. mossambicus. © 2016 Springer International Publishing Switzerland Source

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