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Influence of El-Nino Southern Oscillation on Pelagic Fisheries (Sardinella lemuru) in Bali Waters (1995-1999)

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  • El-Nino Southern Oscillation has many impacts on marine environment. During El-Nino 1997-1998, there has been a change in sea surface temperature in Bali water. Bali water is an important contributor for pelagic fisheries, such as Sardinella lemuru, Thunnus sp, Katsuwonus pelamis, and Euthynnus sp. Sardinella lemuru is emphasized, because the Bali strait is a sepcial fishing ground for these fishes. The relation of ENSO and the catch were investigated using the cross correlation method. The ENSO was represented by 6 indices (Multivariate ENSO Index, Southern Oscillation Index, Nino1.2, Nino3, Nino4, Nino3.4) and the fish catch by their number in ton. Because the fish catch data were in three months average, all the ENSO indices were also averaged into 3 months. The result is there is significant correlation between Sardinells lemuru catch, but not for the other three fish. ENSO indices and lemuru catch are significantly correlated in lag 0, -1, and -2 (12 lags were used, level of significance is 99%, one lang represents three months). This means that lemuru catch start to change at the same time, or three to six months before ENSO change. This is possible because ENSO needs time to develop El-Nino; from the weak to stronger stage. Small pelagic fish like lemuru is very sensitive to temperature change, so they can migrate from the beginning of weak ENSO due to find cooler water in Bali strait. The mechanism of the influence is, ENSO changes SST in Bali water which become cooler, then lemuru migrated to this cooler water. It seems that cooler water is more favourable for the lemuru. This is predicted as the reason of why the lemuru catch is increased during El-Nino time of 1997-1998.
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  • Bernawis, Lamona Irmudyawati, Jiro Yoshida. 2004. Influence of El-Nino Southern Oscillation on Pelagic Fisheries (Sardinella lemuru) in Bali Waters (1995-1999). Peer Review: No. In: Proceedings of the Twelfth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 20-30, 2004, Tokyo, Japan: What are Responsible Fisheries? Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2004. CD ROM. ISBN 0-9763432-0-7
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