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杨德国, 危起伟, 王凯, 陈细华, 朱永久. 人工标志放流中华鲟幼鱼的降河洄游[J]. 水生生物学报, 2005, 29(1): 26-30.
引用本文: 杨德国, 危起伟, 王凯, 陈细华, 朱永久. 人工标志放流中华鲟幼鱼的降河洄游[J]. 水生生物学报, 2005, 29(1): 26-30.
YANG De-Guo, WEI Qi-Wei, WANG Kai, CHEN Xi-Hua, ZHU Yong-Jiu. DOWNSTREAM MIGRATION OF TAG -RELEASED JUVENILE CHINESE STURGEON (ACIPENSER SINENSIS)IN THE YANGTZE RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2005, 29(1): 26-30.
Citation: YANG De-Guo, WEI Qi-Wei, WANG Kai, CHEN Xi-Hua, ZHU Yong-Jiu. DOWNSTREAM MIGRATION OF TAG -RELEASED JUVENILE CHINESE STURGEON (ACIPENSER SINENSIS)IN THE YANGTZE RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2005, 29(1): 26-30.

人工标志放流中华鲟幼鱼的降河洄游

DOWNSTREAM MIGRATION OF TAG -RELEASED JUVENILE CHINESE STURGEON (ACIPENSER SINENSIS)IN THE YANGTZE RIVER

  • 摘要: 1998—2002年期间,向长江放流人工繁殖中华鲟2月龄稚鲟(全长75—170cm)1752万尾,其中77957尾用CWT进行标记;14月龄幼鲟(全长550—980cm)400尾,全部用外挂银牌和CWT双重标记。放流后沿长江及沿海收集中华鲟稚鲟和幼鲟样本,4年共回收稚鲟样本6400尾,幼鲟样本13尾,检测到携带标记的稚鲟和幼鲟各13尾。人工放流的幼鲟降海洄游的速度平均达到286km/24h(71—1002km/24h),回捕时离放流点的距离从346—2459km,平均1600km,回捕的标志幼鲟有46.2%的个体来自海区。初步估算出1999年和2000年人工放流个体在长江口幼鲟种群中的贡献率分别为2.281%和0.997%。结果表明,人工放流中华鲟稚鲟和幼鲟的生长、洄游及分布与自然种群没有明显差异。放流较大规格的幼鲟有利于提高成活率,而目前长江中华鲟种群的补充仍以自然繁殖种群为主。

     

    Abstract: 1998-2002, 1752 thousands of juvenile Chinese sturgeon were released in the Yangtze River. Among them,77957 of two month old fingerlings(715) 1710cm Total Length) were tagged with Coded Wire Tags, and 400 fourteen month old juveniles(55) 98cmTotal Length)were tagged with both Coded Wire Tags and external silver tags. We sampled fishes after the release along theYangtzeRiver and costal areas. Within four years, 6400 fingerlings and 13 juveniles were captured.All captured juveniles weretagged and only 13 individuals of captured fingerlings were with tags.No significant difference between the wild fish and cultured released stock regarding the growth and the timing of appearance in the mouth of the Yangtze River. The average downstream migration speed of released juveniles was about 2816km/d(711) 10012km/d),with average distance between the release and recapture sites was 1,600km, ranging from 346km to 2, 459km. 4612% of recapture happened in the ocean. Based on the initial estimates, the contribution of culture released juveniles to the natural juvenile stock in the estuary of theYangtzeRiver is 21281% in 1999 and 01997% in 2000, respectively.Thewild stock of Chinese sturgeon is still themain sourceto maintain the population in theYangtze River.However, to release larger juveniles could contribute more to themaintaining of Chinese sturgeon population since the survival rate of them would be much higher than the fingerlings.

     

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