Abstract
The current study determined Tor putitora (Hamilton, 1822) fishery, growth, mortality, and population characteristics using length-frequency data assembled monthly from the Tehri dam reservoir in Uttarakhand from January to December 2022. The estimation data was separated into 40-mm class intervals, and population parameters were investigated and computed using the FiSAT-II software tool. W = 0.0101 L2.996, where a = 0.0101 and b = 2.99, were determined as the length-weight relationships, and the growth performance index (ϕ) was computed to be 5.40. Tor putitora commercial catches in the Tehri dam reservoir were dominated by length groups of 360–399 and 320–359 mm. Different growth parameters were estimated using length-frequency data as L∞ = 987.00 mm, K = 0.26 yr−1, and t0 = −0.0003 years. Z, M, and F mortality coefficients were estimated to be 1.01, 0.27, and 0.73, respectively. At the end of the first, second, third, fourth, fifth, sixth, and seventh years, the fish measured 226, 400, 535, 638, 718, and 780, and 827, respectively. The estimated value of the exploitation rate (E) was 0.73 using the length-converted catch curve approach, which was determined to be somewhat higher than the optimum value (0.50). Tor putitora recruitment patterns from the Tehri dam reservoir reveal that the species only has one recruitment pattern every year, and that solely occurs from June to September. The current exploitation level (0.73) has already exceeded the maximum fishing pressure (Emax = 0.508), indicating that there is a decline in the catch at the current fishing pressure, and a further increase in fishing efforts may lead to a decline in the stock, which may be detrimental to the sustainable fishery of Tor putitora in the Tehri dam reservoir, Uttarakhand, India.
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The Director of ICAR-CIFRI, Barrackpore, Kolkata, is to be thanked for giving the essential resources and supportive advice to the writers to finish the research findings. The fishermen that fish in the Tehri Dam reservoir generously shared their harvest with the authors.
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Dibakar Bhakta (DB)- Data entry, analysis, and manuscript writing.
Basanta Kumar Das (BKD)- Conceptualization, and editing.
Upendra Singh (US)- Field data collection, data entry and analysis.
Archisman Ray (AR)- Data entry and analysis.
Canciyal Johnson (CJ)- Data entry and analysis.
Venkatesh Ramrao Thakur (VRT)- Manuscript editing.
Sandeep Kumar Mishra (SKM)- Field data collection.
Sushil Kumar Verma (SKV)- Field data collection.
Absar Alam (AA)- Manuscript editing.
Dharam Nath Jha (DNJ)- Manuscript editing.
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Bhakta, D., Das, B.K., Singh, U. et al. Fishery, growth, mortality, and stock assessment of endangered Tor putitora from Tehri dam reservoir, Uttarakhand, Himalayan foothills of India in relation to environmental variables. Environ Monit Assess 195, 1377 (2023). https://doi.org/10.1007/s10661-023-11936-w
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DOI: https://doi.org/10.1007/s10661-023-11936-w