Distribution of albacore (Thunnus alalunga) in the Indian Ocean and its relation to environmental factors
Distribution of albacore (Thunnus alalunga) in the Indian Ocean and its relation to environmental factors
复制标题
DOI：
10.1111/j.1365-2419.2004.00322.x
复制
发表时间：
2005-01-01
影响因子：
2.6
通讯作者：
Tzeng, WN
中科院分区：
文献类型：
--
作者：
Chen, IC;Lee, PF;Tzeng, WN
根据1979-85年台湾金枪鱼延绳钓渔获量资料，分析了印度洋长鳍金枪鱼的分布格局。台湾的金枪鱼渔业于1967年开始在印度洋作业。我们利用地理信息系统编制了渔业和环境数据库，并对长鳍金枪鱼的单位努力渔获量(CPUE)分布进行了统计分析。结果表明，未成熟长鳍金枪鱼主要分布在30°S以南海域，但也有部分呈南北季节性迁徙。成熟长石也表现为南北向迁移，主要集中在南纬10度至南纬25度之间。在南纬10度和南纬30度范围内，成熟、产卵和未成熟长臂猿生活史阶段的分离大致与印度洋三大洋流系统的分界线重合。用逐步判别分析预测CPUE的最佳环境变量因生活史阶段不同而异。对于未成熟的长鳍金枪鱼，海面变量海表面温度(SST)、叶绿素浓度和表面盐度是显著的。对于成熟的长鳍金枪鱼来说，SST是显著的，而对于产卵的长鳍金枪鱼来说，100m处的温度和200m处的氧气次表层变量是显著的。产卵的长鳍金枪鱼显然更喜欢深海环境。我们在印度洋不同发育阶段所偏好的海洋条件的研究结果与之前在太平洋发现的研究结果是一致的。
The distribution pattern of albacore, Thunnus alalunga, in the Indian Ocean was analyzed based on catch data from the Taiwanese tuna longline fishery during the period 1979-85. The Taiwanese tuna fishery began operating in the Indian Ocean in 1967. We used a geographic information system to compile a fishery and environmental database and statistically explored the catch per unit effort (CPUE) distribution of albacore. Our results indicated that immature albacore were mainly distributed in areas south of 30degreesS although some displayed a north-south seasonal migration. Mature albacore, which were mainly concentrated between 10degreesS and 25degreesS, also showed a north-south migration. Within 10degreesS and 30degreesS, the separation of mature, spawning, and immature albacore life history stages roughly coincided with the boundaries of the three oceanic current systems in the Indian Ocean. The optimal environmental variables for CPUE prediction by stepwise discriminant analysis differed among life history stages. For immature albacore, the sea surface variables sea surface temperature (SST), chlorophyll concentration and surface salinity were significant. For mature albacore, SST was significant, while for spawning albacore, the sub-surface variables temperature at 100 m and oxygen at 200 m were significant. Spawning albacore evidently prefer deep oceanographic conditions. Our results on the oceanographic conditions preferred by different developmental stages of albacore in the Indian Ocean were compatible with previous studies found in the Pacific Ocean.