Sprkplg is right - it's generally being accepted that invasive bivalve introduction to Havasu are responsible for the accelerated growth. I also read that Drum and Blue cats love Zebra and Quaggas. While it's negative impact on the ecosystem is well founded, at least there's some benefit from introduction of these mussels - we could be seeing some huge fish coming down the pike. I don't think 5.5 lbs is the top range for RES with that much available forage protein with little to no effort expend energy to stalk and ambush. A RES could literally sit on a reef of these things and not move more than a fin all day. Sounds appealing, actually!


Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

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