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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Downstream migration patterns of one-year-old hatchery-reared European sturgeon (Adpenser sturio)
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Downstream migration patterns of one-year-old hatchery-reared European sturgeon (Adpenser sturio)

机译：一岁孵化场饲养的欧洲st鱼（Adpenser sturio）的下游迁移模式

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Acoustic telemetry was used to quantify the behaviour of 94 hatchery-reared European sturgeon (27-38 cm in fork length) released in their native watershed. The study took place between July and December 2008 and between April and May 2009 in the tidal part of the Gironde system (south-west France) from freshwater to mesohaline estuary. Survival rate for the first month was estimated at 87% and the individual trajectory of 82 fish was characterised. The mean distance covered per fish was 104 km, the mean ground swimming speed was 0.7 ms~(-1) and no diel influence was highlighted. Three main downstream migration patterns were highlighted with a first group of individuals settling in the freshwater part of the system, a second group covering medium distances (105 km) and displaying fairly straight movement to reach the upstream estuary, and a third group of very active fish with repeated up and down movements into the mesohaline estuary covering two times more distances. We suspect that these patterns correspond to different exploratory behaviours and salinity tolerances among individuals of the same size and cohort. According to our experiment, both the downstream freshwater part of the rivers and the upstream estuary represent important habitats for this age class. The direction of individual trajectory indicates that most of the fish displaying upstream and downstream movements gradually shifted downstream between 1 and 6 months after their release.
机译：声学遥测用于量化在其原生流域释放的94个孵化场饲养的欧洲st鱼（叉长27-38厘米）的行为。该研究于2008年7月至2008年12月之间以及2009年4月至2009年5月之间在吉伦特河系统（法国西南部）的潮汐部分进行，从淡水到中卤河口。第一个月的成活率估计为87％，确定了82条鱼的个体轨迹。每条鱼的平均覆盖距离为104 km，平均地面游泳速度为0.7 ms〜（-1），没有发现迪尔影响。突出显示了三种主要的下游迁移方式，第一类人居住在系统的淡水部分，第二类人覆盖中等距离（105公里）并表现出相当笔直的运动以到达上游河口，第三类人非常活跃鱼反复向上和向下运动进入中卤河口，覆盖距离是原来的两倍。我们怀疑这些模式对应于相同规模和同类人群中不同的探索行为和盐度耐受性。根据我们的实验，河流的下游淡水部分和上游河口都代表了这一年龄段的重要栖息地。单个轨迹的方向表明，大多数显示出上游和下游运动的鱼在释放后的1至6个月内逐渐向下游移动。

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