Incidence of Black Spot Infection and Growth Patterns in Schizothorax richardsonii (Gray) and Schizothorax plagiostomus (Heckel) from Garhwal (West Himalaya)
Journal Title: Voyager - Year 2017, Vol 0, Issue 1
Abstract
Diseases affect the economic value of fish. In view of its importance to fishery management investigations were carried out to determine the incidence of black spot infection and length-weight relationship of Schizothorax richardsonii (Gray) and Schizothorax plagiostomus (Heckel) in diseased fish. Samples of snow trout were collected randomly from the Alaknanda at Srinagar and incidence of disease categorized into low, medium and high infection with respect to their sex, size and season. The length-weight relationship was estimated by least square methods. The incidence of infection varied moderately with respect to sex, increased with size and was generally high during summer in both species of Schizothorax. The length-weight relationship indicated by ‘n’ follows the general parabola and increase in total length wsas highly significant for the increase in total weight of the fish. Linearity was highest in female S. richardsonii and male S.plagiostomus. Low value of ‘n’ in male as compared to female of S. plagiostomus and male as well as female of S. plagiostomus may denote marked effect of infection in male of S. richardsonii
Authors and Affiliations
Padma Vashist
Keywords
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