Seasonal changes in fishes ascending a paddy field ditch in the Naka River system, central Japan
Seasonal changes in fishes ascending a paddy field ditch in the Naka River system, central Japan
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日本中部那珂川水系稻田沟渠中鱼类的季节变化
DOI：
10.11369/jji1950.50.25
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Oda
中科院分区：
文献类型：
--
作者：
Tomoyuki Nakamura;N. Oda
1999年4月至10月和2000年4月至9月，记录了日本中部纳卡河水系小川稻田沟渠中鱼类数量和成熟度的季节性变化。1999年和2000年分别捕获鱼类17种949尾和12种745尾。两个年份的优势种群均为长颌须鱼、泥鳅和东京黄颡鱼。G.长身鳅、双尾鳅和吻虎鱼的捕捞时间为春末（4月）至初夏（6月），大部分为成熟期。东海拟黄颡鱼、鲇和鸭嘴兽在夏季（6 - 8月）捕捞，大多数也是成熟的。在夏秋季（7 - 10月）捕捞的是青和赤拟谷盗（主要是幼鱼）。在整个研究期间（4月至10月），捕获了成熟和幼泥鳅。结果表明，不同物种的沟渠上升的时间和目的不同，沟渠显然是重要的，在维持稻田淡水鱼类的生物多样性。
Seasonal changes in the number and maturity of fishes ascending the Ogawa paddy field ditch in the Naka River system, Tochigi Prefecture, central Japan, were recorded from April to October in 1999 and from April to September in 2000. Totals of 949 fishes, representing 17 species and 745 fishes (12 species) were trapped in 1999 and 2000, respectively. Gnathopogon elongatus elongatus, Misgurnus anguillicaudatus and Pseudobagrus tokiensis were dominant in both years. Most individuals of G. elongatus elongatus, Cobitis biwae and Rhinogobius sp. OR were caught from late Spring (April) to early summer (June), most being mature. Pseudobagrus tokiensis, Silurus asotus and Zacco platypus were caught in summer (June—August), most also being mature. Zacco temminckii and Tribolodon hakonensis (mostly juveniles) were caught in summer and autumn (July—October). Mature and juvenile Misgurnus anguillicaudatus were caught throughout the study period (April—October). The results indicated varying periods and purposes for ditch ascent among the species, the ditches clearly being important in maintaining the biodiversity of freshwater fishes in paddy fields.