So I put my hydrophones in the upper reaches of the Baron River (Mount Hypipamee National Park, far North Queensland - Australia) expecting to hear only gurgling and bubbling, but to my surprise there was some aquatic creatures communicating (sounds a little like crickets). I suspect it's either a fish or crustacean of some sort. If anyone knows what these are please let me know. Recording chain: Home made hydrophones from Panasonic WM61-A - Edirol R09HR.
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