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Turkish Journal of Fisheries and Aquatic Sciences 2008, Vol 8, Num, 1     (Pages: 125-132)

Life- History Traits and Decadal Trends in the Growth Parameters of Golden Mahseer Tor putitora (Hamilton 1822) from the Himalayan Stretch of the Ganga River System

Prakah Nautiyal 1 ,Anees Fatma Rizvi 2 ,P. Dhasmanaa 1

1 H N B Garhwal University, Department of Zoology, Srinagar, 246174, India
2 Institute of Applied Sciences, Allahabad 211002, India
Viewed : 2155 - Downloaded : 2942 Life-history traits such as age and body growth patterns of Tor putitora (Hamilton 1822), inhabiting the lesser Himalayan stretch of the Ganga river system in the Garhwal region were examined during 1994 and 1995. The maximum age was recorded to 17+ whereas harvestable size was 65.6 cm. The asymptotic length (L>∞) exhibited a relative decline from 272 cm (K = 0.035 year-1) in 1980-81 to 216 cm (K = 0.041 year-1) in 1994-95 resulting in the corresponding increase of the growth coefficient (K). The total, natural and fishing mortality coefficients also exhibited a similar pattern 0.366, 0.054 and 0.312 and 0.58, 0.063, 0.517 year-1, respectively during 1980-81 and 1994-95. This was reflected in the exploitation rate and ratio also, 0.376 and 0.852 and 0.7 and 0.891 year-1 respectively for 1980-81 and 1994-95 Keywords : age, growth, asymptotic length, mortality, exploitation, decadal trends