Sivaraman G.K.,Institute of Fisheries Technology |
Barat A.,Coldwater Fisheries Research ICAR |
Ali S.,Coldwater Fisheries Research ICAR |
Mahanta P.C.,National Bureau of Fish Genetic Resources
Journal of Environmental Biology | Year: 2014
The genetic polymorphism and gene flow rate among the Indian snow trout fish population S.richadsonii from three different locations viz., Chirapani stream of Champawat district, Kosi and Gola river of Nainital district, Uttarakhand State, India were assessed by employing twenty numbers of Randomly Amplified Polymorphic DNA (RAPD) markers. The overall percent polymorphisms among these three populations were 14.76 with 6.56, 4.92 and 3.28 in Chirapani, Kosi and Gola river population, respectively. Chirapani population had higher proportion of polymorphic loci as compared to the Kosi and Gola. The highervalue of genetic distance (0.1565) was obtained between Chirapani and Gola population and the lower value of genetic distance was observed between Chirapani and Kosi (0.1058) river population. The cluster analysis revealed that in the formation of two clusters, one consisted of Chirapani and Kosi and the otherwas Gola fish population. Gst estimates among these populations showed some extent of homogeneity with lower genetic differentiation rate between populations and further suggested that highertolerance to mutation, as expected that RAPD bands, arose from both coding and non-coding DNA regions. The findings revealed that the rate of gene flow in three populations seemed very low i.e. highly conserved its genetic diversity in their natural waterbodies and indicative of little migration among populations (geographically isolated and not the possibilities man made interventions! introduction of similar kind of fish species). It is further concluded that the Chirapani, Kosi and Gola river populations of S.richardsonii were being conserved naturally in their habitat and the species actual genetic potential were being maintained (adaptation to local climatic conditions, reproduction, production traits and disease resistance trait etc) in their natural habitat. © Triveni Enterprises, Lucknow (India).
Akhtar M.S.,Coldwater Fisheries Research ICAR |
Akhtar M.S.,Central Institute of Fisheries Education |
Pal A.K.,Central Institute of Fisheries Education |
Sahu N.P.,Central Institute of Fisheries Education |
Ciji A.,Central Institute of Fisheries Education
Israeli Journal of Aquaculture - Bamidgeh | Year: 2013
The effects of temperature and salinity stress on hemato-immunological factors in juvenile Labeo rohita fed normal or elevated levels of tryptophan were studied. Fish were fed diets with 0.35% (control), 0.7%, or 1.4% tryptophan for 60 days, then exposed to temperature and/or salinity stress for the next 30 days with the same feeding regime. The specific growth rate (SGR) was significantly reduced in fish fed the control diet and exposed to stress while dietary supplementation of tryptophan significantly augmented the SGR in stress-exposed fish. Red blood cell count (RBC), white blood cell count (WBC), hemoglobin (Hb), and respiratory burst activity (RBC) were significantly reduced by exposure to temperature and/or salinity stress. Dietary supplementation of tryptophan restored WBC and NBT but not RBC and Hb. Salinity and thermal stress reduced total protein, albumin, and globulin levels as well as serum lysozyme activity. Dietary supplementation of 1.4% tryptophan improved total serum protein, albumin, and globulin levels, as well as serum lysozyme activity. Results of the present study suggest that supplementation of tryptophan at a high level (1.4% of the diet) restores growth and improves the hemato-immunological status of L. rohita under thermal and salinity stress.
Gupta M.,Gbpant University Of Agriculture And Technology |
Upadhyay A.K.,Gbpant University Of Agriculture And Technology |
Pandey N.N.,Coldwater Fisheries Research ICAR
Journal of Environmental Biology | Year: 2013
An attempt was made to distinguish the possible organoleptic differences between the pond reared and wild fish species of reservoirs and correlate these with the physicochemical characteristics of water bodies. The texture was found to firmer in wild varieties of fishes than pond reared fish, with best in Catla catla followed by Labeo rohita and Cirrhinus mrigala. All the cultured fishes had lighter colour than wild fish species which were darker in appearance. Comparatively, higher dissolved oxygen and transparency levels with low temperature and alkalinity levels were found in reservoirs. Hydrobiologically, the efficient ecosystem of reservoir was responsible for stronger texture and dark colouration in wild fish species. The fishes from reservoir exhibit tendency to lead active and agile life, comparatively the fishes from ponds are docile. Reservoirs have the potential of enhanced quality fish production. © Triveni Enterprises, Lucknow (India).