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首页> 外文期刊>ICES Journal of Marine Science >Passive- and active-acoustic properties of a spawning Atlantic cod (Gadus morhua) aggregation
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Passive- and active-acoustic properties of a spawning Atlantic cod (Gadus morhua) aggregation

机译：产卵大西洋鳕鱼（Gadus morhua）聚集体的被动和主动声学特性

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摘要

A spawning aggregation of Atlantic cod (Gadus morhua) was observed at depths of 40-50 m with passive- and active-acoustic sensors at the Bar Haven grounds in Placentia Bay, Newfoundland, in April 2003. A hydrophone was positioned on the seabed beneath the aggregation, while a 38-kHz split-beam echosounder was moored at the sea surface above it for 18.5 h. Ten grunts were recorded with peak frequencies ranging from 30 to 250 Hz and durations of nearly 300 ms. These grunts are similar to the sounds recorded in the presence of captive, spawning cod from the same substock. The echogram reveals that cod exhibit diel, vertical-migratory behaviour, densely aggregating near the seabed by day and forming columns that extend approximately halfway to the surface at night. This is the first study to demonstrate that cod produce sounds and form columns while migrating vertically during night-time spawning.
机译：2003年4月，在纽芬兰的Placentia湾的Bar Haven地面上，使用被动和主动声传感器在40-50 m的深度观察到了大西洋鳕的产卵聚集。水听器位于下面的海床上聚集时，将38 kHz的分束式回声测深仪停泊在其上方的海面上18.5小时。记录了十个咕unt声，其峰值频率范围为30到250 Hz，持续时间近300毫秒。这些咕unt声与从相同子库中捕获的，产卵的鳕鱼的声音类似。回波图显示，鳕鱼表现出淡淡的，垂直迁移的行为，白天白天在海底附近密集聚集，并在晚上形成大约延伸到水面一半的圆柱。这是第一个证明鳕鱼在夜间产卵时垂直移动时会发出声音并形成圆柱的研究。

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