Fishery, population characteristics and stock estimates of Nemipterus bipunctatus were studied during June 2015 to May 2016 from Wadge Bank, South India. This region is characterised by rich biodiversity and has a conducive influence of the Indian Ocean and Arabian Sea. The asymptotic length (L∞), growth coefficient (K) and arbitrary origin of growth (t0) were estimated as 30.5 cm, 0.85/year and 0.18 respectively. The mortality parameters, total mortality rate (Z), fishing mortality rate and natural mortality rate (M) were estimated as 2.20, 0.95 and 1.25 respectively. Exploitation ratio (E) was found to be 0.57 which showed marginal over exploitation of the species at Wadge Bank. This species has two recruitment seasons, one major season from October to December and another minor season in August. The length structured Virtual population analysis revealed heavy fishing pressure on the length group 24 to 28 cm and hence the delegoa threadfin bream was not found to suffer due to recruitment overfishing in Wadge Bank. Estimated total stock, Maximum Sustainable Yield (MSY) and annual catch were 5625.9348 tonnes, 1935.321t, 2419.152t respectively. Present level of Exploitation rate (U) and Exploitation ratio (F/Z) were estimated to be 0.43 and 0.57 respectively. The study infers the cod end mesh size of the trawls operated at Wadge Bank coast has to be increase from 10 to 25 mm to increase the yield per recruit, the effort could also be maintained as the exploitation ratio of 0.50 to have maximum yield per recruit. The study suggests reducing the present level of effort by 8 percent may be needed to sustain the stock of N. bipunctatus in Wadge Bank, South India
Growth, Mortality parameters, MSY, Nemipterus bipunctatus, Recruitment overfishing
Gayanilo, F.C.Jr., Soriano, M. and Pauly, D.(1988). A draft guide to complete ELEFAN. ICLARM Software Project. pp 2: 65.
Gulland ,J.A., (1979). Report of the FAO/ IOP workshop on the fishery resource of the Western Indian Ocean South of Equator. FAO.IOFC /DEV.79/45:1-35.
Hamsa, K. M. S., Ameer, H., Mohamad Kasim and Rajapackiam,S.(1994). Length weight relationship of Lutjanusrivulatus off Tuticorin, Gulf of Mannar. Bull. Cent. Mar. Fish. Res. Inst. 47: 128 –129.
Harris, A. N. and Poiner, I. R. (1990). By-catch of the Prawn Fishery of Torres Strait; Composition and Partitioning of the discards into components that float of sink. Australian Journal of Marine and Freshwater Research. 41(1):37–52.
Joshi, K.K. (2005). Biology and population dynamics of Nemipterus mesoprion (Bleeker) off Cochin. Indian J. Fish. 52 (3): 315-322
John, M.E.(1989). Population dynamics and stock estimates of the threadfin bream (Nemipterus japonieus) off Kerala, India. Contributions to Tropical Fish Stock Assessment in India, pp 45-62. (Eds). Venema S C and Van Zalinge N P. Papers prepared by the partidpanu at the FAO/DANIDA/ICAR National follow up training course on fish stock assessment FI: OCP/INT/392/DEN/l: pp 157.
Joshi, K. K.(2010). Population dynamics of NemipterusJaponicus (Blotch) trawling grounds off Cochin. Indian. J. fish. 57(1): 7-12.
Madanmohan and Velayudhan, A. K.(1984). A few observations on the taxonomy and biology of Nemipterus delagoae Smith from Vizhinjam. Indian J. Fish. 31:113-121
Murty, V. S. (1983). Estimates of Mortality, population size and yield per recruit of Nemiplerusjaponicus (Bloch) in die trawling grounds, off Kakinada. Indian Journal of Fisheries 30: 2-60.
Murty, V. S. (1984). Observaticns on the fisheriei of threadfin breams (Nemipteridae) and on the biology of Nemiplerusjaponicus (Bloch) from Kakinada. Indian Journal of Fisheries. 31: 1-18.
Murty, V. S. (1987). Further studies on growth and yield per recruit of Nemiplerusjaponicus (Bloch) from the trawling grounds off Kakinada. Indian Journal of Fisheries. 34: 265-76.
Muthiah, C. and Pillai, S.K.(1979). A new distributional record of N. Delagoae (Smith) from Bombay waters with notes on its biology. J. mar. bio. Assoc. India. 21 (1-2):174-178.
Pauly,D. and Martosubroto, P. (1980). The population dynamics of Nemipterus marginatus(Cuvier & Val.) off Western Kalimantan, South China Sea. Journal of Fish Biology.17:263– 273
Russell B.C. (1990). Nemipterid fishes of the world (Threadfin breams, whiptail breams, monocle breams, dwarf monocle breams, and coral breams) Family Nemipteridae. An annotated and illustrated catalogue of nemipterid species known to date. FAO Fish. Syn., 12(125) (Russell B.C., ed.) Rome: FAO pp 1-149
Sharum, Y. (2002). Demersal Fish Stock Assessment in the Inshore Area of the East Coast of Peninsular Malaysia, (2001). In: Mansor, M.I. (ed.). Thirteenth Trawl Survey of the Coastal Waters off the East Coast of Peninsular Malaysia (April-June 2001). Ministry of Agriculture Malaysia.pp 138
Sparre, P. and S.C. Venema.(1998).Introduction to tropical fish stock assessment, Part 1-manual. FAO Fisheries technical paper. 2: 306-1.
Swatipriyankasen, G.R. Dash, Mohammed Koya K., Sreenath K.R., Suresh Kumar Mojjada, Mahendra Kumar Fofandi, M.S., Zala and Sonia Kumari.(2014). Stock assessment of Japanese threadfin bream, Nemipterus japonicas (Bloch, 1791) from Veraval water. Indian Journal of Geo-Marine Sciences. 43(4):519-527.
Vivekanandan, E. and James, D.B.(1986). Length-weight relationship in four species of threadfin breams from Madras. J. Mar. Biol. Ass. India. 26(1&2): 132-135.
Vivekanandan, E.(1991). Spawning and growth of three species of thread fin breams off Madras. Indian J. Fish. 38(1): 9-12.
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