Abdul Rehman Yousuf

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The length-weight relationship of Schizothorax niger from Dal lake was calculated ,which can be expressed by the equation,Log W =-5.13+3.07 Log L, for combined ones.The coeffiecient of correlation indicated a high degree of positive relationship between the two parameters.The exponential value (b) of the relationship in this fish species followed the cube(More)
Various studies have shown that the Asian fish tapeworm, Bothriocephalus acheilognathi causes great economic loss in hatcheries, fish farms as well as in lakes. In order to understand the seasonal variation of infection in a nutrient-enriched lake, parasitological investigation was carried out in the indigenous cyprinid fish, Schizothorax niger Heckel 1838(More)
Seasonal population dynamics of the monogenean, Diplozoon kashmirensis Kaw, on the gills of two cyprinid fish species, Schizothorax niger Heckel and Carassius carassius (Linnaeus), was investigated in three limnologically distinct trophic habitats located along the flood plain of River Jhelum in Kashmir from June 2006 to May 2008. The parasite(More)
In order to assess the species richness and diversity profile of helminth parasite fauna in an endemic fish, an investigation was carried out in two urban and two rural lakes of Kashmir. Overall nine species of helminth parasites were observed in four lakes. Of these three were autogenic and six were allogenic. Heteroxenous parasite species were more in(More)
This study was aimed to evaluate the in vivo genotoxic effects of endosulfan in freshwater fish crucian carp, Carassius carassius L. The LC50–96h value of endosulfan (with 95 % confidence limits), determined by probit analysis, was 0.070 (0.046–0.093) ppm L−1 and the estimated safe levels of endosulfan varied from 00.70 × 10−2 to 00.70 × 10−6 ppm L−1. Based(More)
The distribution, abundance, ecology, and diversity of macro-zoobenthos in Lidder stream, a major tributary of the river Jhelum of Kashmir Himalaya was investigated for one year. The study was carried at three zones (upstream, midstream and downstream) of varied topography and physical characteristics. The habitat of each zone was determined with respect to(More)
Lakes have an esthetic significance that is particularly important for attracting tourism. In this context, it is often preferable for lakes to have clear water, so many lake managers attempt to achieve clear lake water by various means. However, the lakes of Kashmir Himalaya are undergoing several complex ecological changes due to, for example, increasing(More)
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