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Bhubaneshwar, India

Ray L.,KIIT University | Suar M.,KIIT University | Pattnaik A.K.,Chilika Development Authority | Raina V.,KIIT University
International Journal of Systematic and Evolutionary Microbiology | Year: 2013

A novel actinobacterial strain, designated RC 1830T, was isolated from the sediment of estuarine coastal brackish water lagoon of Chilika Lake, in Khurdha district of Odisha, India, and characterized using a polyphasic approach. Strain RC 1830T was halophilic and alkali-tolerant and found to hydrolyse chitin, starch, tributyrin, lecithin, Tween 80, cellulose, gelatin and casein. The diagnostic presence of LL-diaminopimelic acid, iso-C15: 0, anteiso-C15: 0, iso-C16: 0, C16: 0, iso-C17: 0, anteiso-C17: 0 as major cellular fatty acids and MK-9(H4 and H6) as major menaquinones noticeably associated the strain to the genus Streptomyces. After comparison and analysis of the near complete 16S rRNA gene sequence with representative strains of other streptomycetes, it was evident that strain RC 1830T belonged to the genus Streptomyces, and exhibited the highest sequence similarities of 99.53 %, 99.25 %, 99.11 %, 99.10% and 99. 06% to Streptomyces fragilis DSM 40044T, Streptomyces coelicoflavus NBRC 15399T, Streptomyces flaveolus NBRC 3715T, Streptomyces lavenduligrisesus NBRC 13405T and Streptomyces eurythermus ATCC 14975T, respectively. Reconstruction of a phylogenetic tree for the genus Streptomyces revealed that strain RC 1830T formed a distinct phyletic line and clustered with its most closely related neighbour S. fragilis DSM 40044T. The DNA-DNA relatedness values between strain RC 1830T and the most closely related type strain S. fragilis DSM 40044T were determined to be 17.7±4.55 %. Additionally, morphological, biochemical and physiological tests were able to distinguish the strain from the most closely related type strain S. fragilis DSM 40044T and other closely related neighbours, S. coelicoflavus DSM 41471T and Streptomyces flaveolus DSM 40061T. Based on a range of phenotypic and genotypic properties, strain RC 1830T is suggested to represent a novel species of the genus Streptomyces for which the name Streptomyces chilikensis sp. nov. is proposed. The type strain is RC 1830T (=JCM 18411T=DSM 42072T). © 2013 IUMS. Source

Sahoo R.K.,Berhampur University | Mohanty P.K.,Berhampur University | Samal R.N.,Chilika Development Authority
Indian Journal of Geo-Marine Sciences | Year: 2016

Inlet hydraulics of Chilika Lagoon is studied using various observed inlet parameters (tide, current and morphology) and computing parameters such as hydraulic radius, inlet impedance, King’s inlet frequency and friction, maximum channel velocity, phase lag and repletion coefficient during 2009 for spring and neap tide conditions. It is revealed that maximum water level variation in the lagoon occurs during May and is associated with wind –tide interaction in the absence of freshwater discharge. Results indicate ebb dominance of inlet during wet period (July to December) and flood dominance during dry period (February to May) of the lagoon. Period of maximum ebb current (July) coincides with the period of maximum fresh water discharge while period of maximum flood current (May) coincides with the period of maximum momentum input and percentage of sea distribution. Ebb dominance of the inlet is also revealed through computation and analysis of hydraulic parameters, primarily repletion values. Keeping in view the role of inlet hydraulics on the cotemporary phase of lagoon transformation, integration of inlet management into the overall ecosystem management of the lagoon is suggested. © 2016, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved. Source

Mohapatra A.,Fakir Mohan University | Mohanty R.K.,Directorate of Water Management | Mohanty S.K.,Chilika Development Authority
Indian Journal of Fisheries | Year: 2011

The annual catch per unit effort (CPUE) values for nine different types of fishing gears in use in mud crab fishery in Chilika lake, Odisha were estimated to evaluate their comparative catching performance. The pooled mean annual CPUE values indicated that the lift net was the most efficient crab fishing gear (0.78 ± 0.04), followed by crab pot (0.61 ± 0.06) and baited long line without hooks (0.53±0.03). Monofilament gill net (0.44 ± 0.02), single hook hand line (0.37 ± 0.016), monofilament screen barrier (0.34 ± 0.02) and triangular push net (0.29 ± 0.02) showed moderate fishing efficiency, while split bamboo traps (0.19 ± 0.01) and scoop net (0.10 ± 0.006) were the least efficient gears. The results of the present study also indicate the need for regulation of crab fishing gears such as monofilament screen barrier trap and triangular push net, in which the catch of juvenile fishes, prawns and crabs predominate, in order to conserve fishery resources in the Chilika lake. Source

Jayasankar P.,Indian Central Institute of Freshwater Aquaculture | Patel A.,Indian Central Institute of Freshwater Aquaculture | Khan M.,Chilika Development Authority | Das P.,Indian Central Institute of Freshwater Aquaculture | Panda S.,Nandankanan Biological Park
Molecular Biology Reports | Year: 2011

Of the only known two Lagoon populations of Irrawaddy dolphins (Orcaella) in the world, one is residing in the Chilika Lagoon in Orissa state, India. In addition to accidental deaths in gill net fishery and mechanized boat operations, there has been exploitation of the species for their oil. Extreme patchy distribution and vulnerability to becoming entangled in fishing gear has made it a focus of conservation concern. Information on genetic diversity of populations has considerable potential for informing conservation plans. The present paper reports the first genetic study of O. brevirostris from Chilika Lagoon based on mtDNA sequencing and PCR-based sex identification from 11 individuals. Control region sequence comparison showed two haplotypes and cytochrome b a single haplotype in the Chilika population of the species. Phylogenetic analysis indicated distinct clades within the Asian samples, with the Indian population showing closest genetic proximity to the haplotypes from Thailand. Sex of the animal was determined by PCR-based method. It is important to continue to examine the population discreteness and genetic variation of Irrawaddy dolphin in Chilika Lagoon vis-à-vis its global geographic distribution for formulating the conservation plans of the species. © 2010 Springer Science+Business Media B.V. Source

Akamatsu T.,Japan National Research Institute of Fisheries Engineering | Akamatsu T.,Japan Science and Technology Agency | Ura T.,Tokyo University of Science | Sugimatsu H.,Tokyo University of Science | And 8 more authors.
Journal of the Acoustical Society of America | Year: 2013

Abundance estimation of marine mammals requires matching of detection of an animal or a group of animal by two independent means. A multimodal detection model using visual and acoustic cues (surfacing and phonation) that enables abundance estimation of dolphins is proposed. The method does not require a specific time window to match the cues of both means for applying mark-recapture method. The proposed model was evaluated using data obtained in field observations of Ganges River dolphins and Irrawaddy dolphins, as examples of dispersed and condensed distributions of animals, respectively. The acoustic detection probability was approximately 80%, 20% higher than that of visual detection for both species, regardless of the distribution of the animals in present study sites. The abundance estimates of Ganges River dolphins and Irrawaddy dolphins fairly agreed with the numbers reported in previous monitoring studies. The single animal detection probability was smaller than that of larger cluster size, as predicted by the model and confirmed by field data. However, dense groups of Irrawaddy dolphins showed difference in cluster sizes observed by visual and acoustic methods. Lower detection probability of single clusters of this species seemed to be caused by the clumped distribution of this species. © 2013 Acoustical Society of America. Source

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