Investigations on the age, growth and mortality parameters of Kawakawa, Euthynnus affinis (Cantor, 1849) from the North west coast of India

Vinod Kumar Mudumala, Mahesh Kumar Farejiya, Kiran S. Mali, Karri Rama Rao, Pradnya Sawant Ankush, Siva Anandhan


Kawakawa, Euthynnus affinis contributes to the tune of 35,466 tonnes forming 1% to the total marine fish landings of India. Investigations on growth and mortality were of this species carried out based on the length frequency data during 2008-2012. The length-weight relationship for the pooled samples were derived for intercept a=0.0286, slope b=2.857 and coefficient of determination r2=0.917. The values obtained for growth parameters of L∞ was 67.86 cm, for growth coefficient (K) 0.70 and for to -0.26y-1. The natural, total and fishing mortalities recorded as 0.86, 1.48 and 0.62 y-1,respectively. The exploitation ratio (F/Z) was observed as 0.42. The M/K ratio was estimated at 1.23. The average fork length of 46 cm and weight of 2024 g were estimated in the samples collected. The length at the end of 1st year to 5th year was observed to be 33, 52, 64, 70 and 75 cm, respectively. The fishing mortality derived in this study is more than the optimum and limit value indicated the sign of overexploitation.


Asymptotic length, Mortality, Exploitation ratio, Length at age.

Full Text:



Ahmed Q., Yousuf F., Sarfraz M., Ali Q.M., Balkhour M., Safi S.Z., Ashraf M.A. (2015). Euthynnus affinis (little tuna): fishery, bionomics, seasonal elemental variations, health risk assessment and conservational management, Frontiers in Life Science, 8(1): 71-96.

Ahmed Q., Bilgin S., Bat L. (2016). Length based growth estimation of most commercially important Scombridae from offshore water of Pakistan Coast in the Arabian Sea. Turkish Journal of Fisheries and Aquatic Sciences, 16: 155-167.

Al-Zibdah M., Odat N. (2007). Fishery status, growth, reproduction biology and feeding habit of two scombrid fish from the Gulf of Aqaba, Red Sea. Lebanese Science Journal, 8(2): 3-20.

Beverton R.H.J., Holt S.J. (1956). A review of methods for estimating mortality rates in exploited rates in exploited fish populations with special reference to source of bias in catch sampling. Rapports et procès-verbaux des reunions, CIEM, 140: 67-83.

CMFRI (2017). Central Marine Fisheries Research Institute, Cochin, Annual Report, 2016-17. 289 p.

FAO (2017). FAO Year book. Fishery and Aquaculture Statistics. 2015. Rome/ Italy. 107 p.

Froese R. (2006). Cube law, condition factor and weight length relationships: history, meta-analysis and recommendations. Journal of Applied Ichthyology, 22: 241-253.

Froese R., Pauly D. (2007). Fishbase., version (07/2007).

Froese R., Tsikliras A.C., Stergious K.I. (2011). Editorial note on weight-length relations of fishes. Acta Ichthyologica et Piscatoria, 41: 261-263.

Gayanilo F.C., Sparre P., Pauly D. (2005). FAO- ICLARMStock Assessment Tools II (FiSAT II), user’s guide, computerized information series (Fisheries) No. 8, (Revised Version), Food and Agriculture Organization of the United Nations, Rome, Italy.

Johnson M.G., Tamatamah A.R. (2013). Length frequency distribution, mortality rate and reproductive biology of kawakawa (Euthynnus affinis-Cantor, 1849) in the Coastal Waters of Tanzania. Pakistan Journal of Biological Sciences, 16: 1270-1278.

Kasim H.M., Abdussamad E.M. (2003). Stock assessment of coastal tunas along the east coast of India. In: V.S. Somvanshi, S. Varghese, A.K. Bhargava (Eds.). Proc. Tuna Meet-2003. pp: 42-53.

Kaymaram F., Darvishi M. (2012). Growth and mortality parameters of Euthynnus affinis in the northern part of the Persian Gulf and Oman Sea. Indian Ocean Tuna Commission (IOTC), Working Party on Neritic Tunas (WPNT), IOTC-2012-WPNT02-14. 14 p.

Khan M.Z. (2004). Age and growth, mortality and stock assessment of Euthynnus affinis (Cantor) from Maharashtra waters. Indian journal of Fisheries, 51(2): 209-213.

MOA (2011). Report of the working group for revalidating the potential of fishery resources in the Indian EEZ, Ministry of Agriculture, New Delhi. 69 p.

Munro J.L., Pauly D. (1983). A simple method for comparing growth of fishes and invertebrates. ICLARM Fishbyte, 1: 5-6.

Pauline D., Janaka D.S. (1991). An assessment of kawakawa (Euthynnus affinis) stock on the west coast of Sri Lanka. Asian Fisheries Science Journal, 4: 219-226.

Pauly D., Munro J.L. (1984). Once More on the Comparison of Growth in Fish and Invertebrates. ICLARM Fishbyte, 2: 21.

Rohit P., Chellappan A., Abdusssamad E.M., Joshi K.K., Said Koya K.P., Sivadas M., Ghosh S., Margaret Muthu Rathinam A., Kemparaju S., Dhokia H.K., Prakasan D., Beni N.(2012). Fishery and bionomics of the little tuna, Euthynnus affinis (Cantor, 1849) exploited from Indian waters. Indian Journal of Fisheries, 59(3): 33-42.

Valeiras X., Macias D., Gomez M.J., Lema L., Godoy D., Ortiz de Urbina J.M., de la SernaJ. M. (2008). Age and growth of Atlantic little tuna (Euthynnus alletteratus) in the western Mediterranean Sea. ICCAT, 62(5): 1638-1648.


  • There are currently no refbacks.