【无聊时刻】呃，原来鱼也会放屁 University

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科学家使用仪器，在水下发现了一种细小声音，经过调查发现，这尼玛其实就是鱼的屁声。

这个部署在佛罗里达坦帕湾的机器，每隔5分钟，就会窃听大海25秒。它会纪录海洋的各种数据，温度、盐度等等。当然，最重要的是，它能够纪录鱼儿们发出的的声音。

来自University of South Florida 的研究人员，近日总结并发表了他们的观察结果。他们发现：在海底40米深的地方，常常会发出一种细碎的声音，这声音不分白天黑夜，神秘的蛊惑着研究人员的心。

经过分析，研究人员觉得，这尼玛应该是鱼在放屁，是气体从鱼儿浮力器官排除时的声音。

目前，为了搞清楚这些屁到底是什么鱼放的，他们正在调查这一带海域的鱼种分布，猜测应该鲱鱼群。

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   Researchers hoping to better understand fish distributions by recording the sounds they make have picked up something unusual: barely-audible, cricket-like noises they think could be nighttime fish farts. The team programmed a torpedo-shaped robot called a glider to head out to sea from Tampa Bay and back, running up and down the water column in a saw-tooth pattern, sampling ocean sounds for 25 seconds every 5 minutes. The glider also recorded location data and measured seawater temperature, salinity, and depth over the course of 1 week.
    By comparing the grunts and whistles on their recordings to known fish calls, University of South Florida researchers found red grouper (shown, Epinephelus morio) and toadfishes (Opsanus spp.) were the most frequent fish sounds recorded, the team reports this month in Marine Ecology Progress Series. These fish produced sounds throughout the day and night, mostly deeper than 40 meters. The probable farts were recorded shallower than 40 meters, and were most likely a group of fish, including menhaden and herring, releasing gas from an internal buoyancy organ called a swim bladder. By mapping these sounds, the researchers hope to get a better picture of species distributions and likely spawning areas—important information for management and conservation efforts.