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根据2009年3～4月在印度洋中南部水域作业的中国金枪鱼延绳钓渔船上收集数据,基于反映鱼类繁殖能力的重要指标—性腺指数(GSI)及其影响因素—表温(SST)、100 m水层的水温(TEMP)及200 m水层的溶解氧浓度(DO),对长鳍金枪鱼繁殖栖息地适应性进行分析。结果表明,表温、表层盐度、100 m水层的水温及200 m水层的DO与印度洋中南部长鳍金枪鱼GSI的最佳上界分位数回归方程分别为pGSISST0.55=159.47-12.20SST0.55+0.24SST20.55,pGSISSS0.70=527.22-28.51 SSS0.70+0.39SSS20.70,pGSITEMP0.55=2.25-0.23TEMP0.55-0.01TEMP20.55和pGSIDO0.70=53.71-17.66DO0.70+1.49DO20.70。调查区域长鳍金枪鱼繁殖栖息地指数分布在0.52～0.97之间。自北向南,繁殖栖息地指数有逐渐增加的趋势,25°S以南水域,繁殖栖息地指数基本上维持在0.65以下。本研究为阐明印度洋长鳍金枪鱼的繁殖空间分布提供了一条新的思路。
Based on the data collected from Chinese longline fishing vessels operating in the central and southern Indian Ocean from March to April 2009, based on the GSI and its influencing factors, such as SST, 100m water temperature (TEMP) and dissolved oxygen concentration (DO) in 200m water layer, the adaptability of albacares tuna breeding habitat was analyzed. The results showed that the regression equation of surface upper temperature, surface salinity, water temperature of 100 m water layer and optimal upper bound quantile of GSI of DO and Indian albacore tuna in the 200 m water layer were pGSISST0.55 = 159.47-12.20SST0 .55 + 0.24SST20.55, pGSISSS0.70 = 527.22-28.51 SSS0.70 + 0.39SSS20.70, pGSITEMP0.55 = 2.25-0.23TEMP0.55-0.01TEMP20.55 and pGSIDO0.70 = 53.71-17.66D00.70 + 1.49DO20.70. The index of breeding habitats of albacore tuna in the survey area ranged from 0.52 to 0.97. From north to south, the index of breeding habitats showed a gradual increase trend. In the waters south of 25 ° S, the index of breeding habitats remained basically below 0.65. This study provides a new idea to elucidate the spatial distribution of the Indian Ocean albacore tuna.