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WIRELESS DolphinEAR:
From $695 for the 'Application' System

DE500 Sound Samples: (Click link to listen)

 FISH SOUNDS

Fish make sounds with their swim bladders.  Why they do so is another matter. But, thanks to work by a number of scientists and biologists we do know that many species make a considerable amount of noise during the spawning season. Spawning grounds can be identified by conducting sound surveys and kept off limits to anglers and boaters to ensure that fish stocks remain high. The DE500 can be used to keep track of these areas.  Sound frequencies are typically under 1000 Hz.  Here is a sample:

The 'door knocking' sound made by this fish is shown above as a series of low frequency pulses.

Fish sounds are very low in frequency.

 The frequency plot above shows that most of the sound energy is below 1000 Hz.

 

 

More samples - all using transmission bandwidths of 3500 Hz or less!

Dolphin Whistles

Dolphin Echo-location Clicks

Humpback whale songs

Gray whale vocalization

Long Distance Marina Sounds: Recorded Live from UK