Chinook swim bladder smaller than sockeye & coho?

clipped from

Sounds Like My Favorite Fish

By Phil Berardelli
ScienceNOW Daily News
12 November 2008

Some of the killer whales off the coast of Washington state are picky eaters, preferring Chinook salmon even though the coho and sockeye varieties are much more plentiful. Researchers report that the whales seem to be able to tell the three species apart by the sonar echoes bouncing off their swim bladders
Their analysis showed that one characteristic–the structure of the echoing sound waves–differed among the coho, sockeye, and Chinook salmon. As bioacoustician and team member Whitlow Au of the University of Hawaii, Honolulu, reported Tuesday at a meeting of the Acoustical Society of America in Miami, Florida, further study showed that the salmon swim bladders vary considerably in size. The Chinook’s bladder is only half as large as those of the other two species.
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