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Both biomass and production of the south Pacific albacore stocks wereestimated by the improved surplus production model.Estimations werebased on the catch and effort data of the south Pacific albacore tuna longlinefisheries.Indices of the area and perimeter of the isotherms of the albacore preferredsea surface temperature and the higher sea surface temperature(over28℃)were measured.They were then used as indices of the sea surfacetemperature of the south Pacific albacore tuna longline fishing grounds.The relations between the albacore stocks and the index of the sea surfacetemperature were examined.The results are as follows:(1)Fluctuations of the south Pacific albacore stocks can not be explainedby the distributions of the preferred sea surface temperature alone.(2)Fluctuations of the south Pacific albacore stocks depend mainly onthe distributions of over 28℃ sea surface temperature.(3)The heavier El Nino events in 1982/83 and the particular developmentof the gill netters in 1989 to 1991 clearly influenced the south Pacificalbacore stocks.(4)After adjusting for the effects of the heavier El Nino events and therapid development of the gill netters,albacore stocks show a significantcorrelation with the index of over 28℃ sea surface temperature.

A Preliminary Study of Retrieving Vortex Circulation Using A Lagrangian Coordinate and Single Doppler Radar Data