Since they are free Jeffrey3 I'd throw them in every year. They probably won't hurt in controlling the mosquitos and heck they're free!

Interesting study Ewest. In researching Sacramento Perch I found an article in which the researchers found that Sacramento Perch eat mosquito larva at a much higher rate than do Gams. In fact at least one county in Northern California is now giving away Sacramento Perch fry in stead of or at least in addition to Gams.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)