Hi Jacqueline,

Regarding your query of
Can anyone direct me to researchers (US and abroad) who are working on:

1)  use of acoustic signals to assess fish populations
2)  swim bladders as acoustic targets
3)  swim bladder structure-function relationships and sound reception

Chuck Wilson and Dave Stanley at LSU have been quite successful employing
acoustics to assess fish populations, specifically using their swim bladders
as targets.  I do not have their contact info handy, but you can track down
Chuck Wilson through LSU's fisheries and oceanography program on the web.
Also, Wilson and Stanley have a nice paper published in a special issue on
artificial reefs in the journal "Gulf of Mexico Science" vol 16 (1) 1998.

Cheers,

Jeff Childs
Marine Vertebrate Zoologist
Visiting Research Scientist
Center for Coastal Studies
Texas A&M University-Corpus Christi
6300 Ocean Drive Suite 3200
Corpus Christi, TX 78412
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