Distributional Analyses, Fishery Potential and Stock Assessment of Fish Species of Doon Valley, Dehradun, Uttarakhand

Deepali Rana; S. K. Gupta; Rahul Rana

doi:10.36808/if/2018/v144i10/139589

Distributional Analyses, Fishery Potential and Stock Assessment of Fish Species of Doon Valley, Dehradun, Uttarakhand

Authors

Deepali Rana Department of Zoology, Dolphin (PG) Institute of Biomedical and Natural Sciences, Manduwala, Chakrata Road, Dehradun
S. K. Gupta D.B.S. (P.G.) College, Dehradun, Uttarakhand
Rahul Rana D.B.S. (P.G.) College, Dehradun, Uttarakhand

DOI:

https://doi.org/10.36808/if/2018/v144i10/139589

Keywords:

Distributional Analysis, Stock Assessment, Fishery Potential, Doon Valley

Abstract

Distributional analyses, fishery potential and stock assessment of fish species of Doon Valley was analysed for a period of two years at 20 sampling stations set of 5 rivers (Baldi, Song, Suswa, Tons and Asan) in Eastern and Western Doon valley. A total of 56 species, belonging to 5 Orders, 13 Families and 30 Genera were recorded during the present Investigation. Spatial (= horizontal distribution) has been highlighted using Venn diagrams to show the number of shared and unique species for Eastern and Western Doon, separately. 41 species (73.21%) are common between East and West, whereas 13 and 2 species are found unique to Eastern and Western streams, respectively. In East, Baldi river shares all its species (30) with Song river. 4 species are common between Baldi and Suswa. Of 46 species from Song river, 37 species are common with Suswa. River Suswa, shows 24 and 13 species common with river Baldi and Song, respectively, whereas 8 species are exclusive representations, which include the 7 new records. In West, Tons and Asan have 27 species common, whereas, 5 and 11 species are exclusive to Tons and Asan, respectively. Temporal distribution is analyzed as per the altitudinal ranges occupied by fishes. Category I (300 - 500 m above msl) both in the East and West show maximum number of fish representatives as compared to those falling under Category II and Category III. Fishery potential of streams of Doon valley season-wise and station-wise has been evaluated in terms of Calculated Productivity Point system (CPF) values. The values come out to be maximum for the East as compared to West. In East itself, Suswa river showed more CPP values followed by Song and Baldi. In West, the maximum CPP values were observed at Asan. Increasing trend in CPP values from upstream to downstream stretches.

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