Behavior and distribution of upstream-migrating juvenilerhinogobius sp. (The orange form)
Behavior and distribution of upstream-migrating juvenilerhinogobius sp. (The orange form)
复制标题
上游洄游幼鱼的行为和分布。
DOI：
10.1007/bf02674266
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发表时间：
2007
影响因子：
1.2
通讯作者：
B. Rusuwa
中科院分区：
文献类型：
--
作者：
M. Yuma;A. Maruyama;B. Rusuwa
吻虎鱼幼鱼的上游洄游沿爱多河（琵琶湖的一条支流）对OR进行了沿着研究。虾虎鱼幼鱼以标准体长18-21 mm为主，下游以3 m左右宽、中游以10-20 cm左右宽的带状洄游。它们向上游的迁移仅限于水深小于20厘米、底流速小于20厘米/秒的地方。在底流速为8.8-20.0 cm/sec的地方，个体迁移速度在4.2-8.9 m/min之间变化，随着流速的增加而减慢。最活跃的迁移发生在14：00和16：00之间，上游迁移的幼鱼数量随着距离河口的距离而减少。在中游和上游的浅滩，有几个慢流区，可能存在的障碍，上游迁移的少年虾虎鱼，虽然成年人和亚成年人的物种分布在更上游。
Upstream-migration of juvenileRhinogobiussp. OR was studied along the Ado River, a tributary of Lake Biwa. Juvenile gobies, mainly 18–21 mm in standard length, migrated from the lake in a belt of about 3 m wide in lower reaches and about 10–20 cm wide in middler reaches. Their upstream-migration was restricted to places shallower than 20 cm with bottom current velocities less than 20 cm/sec. Individual migration speed varied between 4.2–8.9 m/min at places with bottom current velocity of 8.8–20.0 cm/sec, slowing down with increasing current velocity. Most active migration occurred between 14:00 and 16:00, number of upstream-migrating juveniles decreasing with distance from the river mouth. Riffles in the mid-and upper reaches, having few slow current areas, probably present barriers to upstream-migration of the juvenile gobies, although both adults and subadults of the species are distributed in more upper reaches.