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Roy T.S.C.,Tamil University | Gopalakrishnan A.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Gopalakrishnan A.,Andaman and Nicobar Regional Center
Journal of Fish Biology | Year: 2011

The examination of nine species of groupers present in south-east Indian waters has indicated that the pyloric caeca number, pattern and colouration are reliable and useful characters for identification. Three distinct morphotypes of pyloric caeca were observed in this study. © 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles. Source


Jeena N.S.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Jeena N.S.,Central Marine Fisheries Research Institute CMFRI | Gopalakrishnan A.,Central Marine Fisheries Research Institute CMFRI | Kizhakudan J.K.,Central Marine Fisheries Research Institute CMFRI | And 3 more authors.
Hydrobiologia | Year: 2015

Thenus unimaculatus is one of the most important commercially exploited lobster species in India. The declining trend in catches as well as collapse of fishery in some localities necessitated assessment of the stock structure to manage this resource sustainably. We ascertained the genetic stock structure of T. unimaculatus along the Indian coast, using molecular markers. RAPD and concatenated dataset of mitochondrial DNA genes (partial sequences of Cytochrome Oxidase I and Cytochrome b) were used to detect population differentiation. RAPD markers showed moderate genetic variability with an overall GST value of 0.0442, which indicated low genetic differentiation among subpopulations. The mtDNA dataset revealed high haplotype diversity coupled with very low nucleotide diversity that suggested recent population expansion after a period of low effective population size. The median-joining haplotype network showed no geographical clustering of haplotypes. The low levels of genetic differentiation with non-significant P values (FST =0.0593) may be due high connectivity among shovel-nosed lobster populations and resultant panmixia. This may be due to the planktonic phyllosoma larval phase that extends for >1 month in wild and their transport and dispersal by monsoon currents of Northern Indian Ocean. The results of this study will aid in better management of this dwindling resource. © 2015 Springer International Publishing Switzerland Source


Abdul Muneer P.M.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Gopalakrishnan A.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Musammilu K.K.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Basheer V.S.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | And 4 more authors.
Biochemical Genetics | Year: 2012

The comparative assessment of genetic diversity using allozymes, random amplified polymorphic DNA (RAPD), and microsatellite markers was conducted in endemic and endangered yellow catfish (Horabagrus brachysoma) sampled from three locations in Western Ghats river systems of India. Among the three markers, microsatellites show more polymorphism, having 100% polymorphic loci, whereas allozymes show the least (56%). In RAPD, 60.5% of fragments were polymorphic. Observed heterozygosity and F ST values were very high in microsatellites, compared with the other markers. Microsatellite and RAPD markers reported a higher degree of genetic differentiation than allozymes among the populations depicted by pairwise F ST/G ST, AMOVA, Nei's genetic distance, and UPGMA dendrogram. The three classes of markers demonstrated striking genetic differentiation between pairs of H. brachysoma populations. The data emphasize the need for fishery management, conservation, and rehabilitation of this species. © 2011 Springer Science+Business Media, LLC. Source


Musammilu K.K.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Abdul-Muneer P.M.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Gopalakrishnan A.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Basheer V.S.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | And 5 more authors.
Molecular Biology Reports | Year: 2014

Gonoproktopterus curmuca is an endangered red tailed barb found in Southern part of Western Ghat, India. As a part of stock-specific, propagation assisted rehabilitation and management program, polymorphic microsatellites markers were used to study the genetic diversity and population structure of this species from the three River systems of Southern Western Ghats, such as Periyar River, the Chalakkudy River, and the Chaliyar River. From selected eight polymorphic microsatellite markers, the number of alleles per locus ranged from 2 to 8, and the average number of alleles among 3 populations ranged from 5.0 to 5.75. The mean observed (Hob) and expected (Hex) heterozygosity ranged from 0.5148 to 0.5360 and from 0.5996 to 0.6067, respectively. Significant deviations from Hardy - Weinberg Equilibrium expectation were found at majority of the loci (except Gcur MFW72 and Gcur MFW19) and in all three populations in which heterozygote deficits were apparent. The analysis of molecular variance indicates that the percent of variance among populations and within populations were 6.73 and 93.27, respectively. The pairwise FST values between populations indicate that there were significant deviations in genetic differentiations for the red-tailed barb populations from these three Rivers of the Western Ghats, India. The microsatellites methods reported a low degree of gene diversity and lack of genetic heterogeneity in the population of G. curmuca, which strongly emphasize the need of fishery management, conservation and rehabilitation of G. curmuca. © Springer Science+Business Media 2014. Source


Bhat A.A.,Center for Aquaculture Research and Extension | Haniffa M.A.,Center for Aquaculture Research and Extension | Divya P.R.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | Gopalakrishnan A.,National Bureau of Fish Genetic Resources NBFGR Cochin Unit | And 3 more authors.
Molecular Biology Reports | Year: 2012

Murrels (Perciformes; Channidei; Channidae) are unique group of freshwater air breathing fishes having a confined distribution to African and Asian continents. The phylogenetic relationship among eight Channid species viz. Channa aurantimaculata, Channa bleheri, Channa diplogramma, Channa gachua, Channa marulius, Channa punctatus, Channa stewartii and Channa striatus were investigated using RAPD markers. Eight random oligodecamers viz. OPAC03, OPAC05, OPAC07, OPAC09, OPAC19, OPA10, OPA11 and OPA16 were used to generate the RAPD profile. Estimates of Nei's (Genetics, 89:583-590, 1978) unbiased genetic distance (D) demonstrated sufficient genetic divergence to discriminate the samples of different species and the values ranged from 0.3292 to 0.800 The present RAPD analyses strongly substantiate the view of earlier morphological and osteological studies of Channid species, the closer association among species in "gachua" and "marulius" groups. © Springer Science+Business Media B.V. 2011. Source

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