Age, growth, and population dynamics of the Shovelnose catfish, Arius subrostratus (Valenciennes, 1840) in Cochin estuary, India
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Population parameters studies of Shovelnose catfish, Arius subrostratus, from the Cochin estuary were conducted to determine age, growth, mortality, yield per recruit, and exploitation rate. Length frequency data of 1,205 species were collected from different landing centres of the Cochin estuary for this estimation. The Von Bertalanffy growth model is described as Lt = 364 (1-e –0.53 (t+0.023) from the findings. The values of L? and K were calculated to be 364 mm and 0.53, respectively. The estimated lifespan of the catfish, based on the present study, is 5.43 years. The study also revealed total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation rate (E) as 1.56 y-1, 0.59 y-1, 0.97 y-1, and 0.62, respectively. The recruitment pattern of A. subrostratus exhibited a single peak throughout the study period. The present findings revealed overexploitation of the species in the Cochin Estuary and suggested some management measures to ensure its conservation.
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