I had never seen a fish flee from mosquito larvae, but initially that is what happened when I put them in with a Tanganyikan lampeye, Lamprichthys tanganicanus (a fish Pierre Birchard called the most beautiful fish in either the Lake or in all of Africa). They eat insect larvae in the lake's algae beds or "aufwuchs", so I assumed they would go for mossies.
When the larvae were squirted into the tank with a turkey baster, the tanganicanus swam up to them. When the mosquito larvae did that spastic swim away from them, the fish fled. I happened by the tank 25 minutes later and all of the larvae were gone. The killies had figured out what to do. ;)
If they are those pupae (commas on speed) then there are only a few hours at best before the change into marriage threatening gnats. The long larvae must change into that pupae stage first, before becoming flying insects.
Unless your guppies or whatever are dragging their tummies, so full are they with other live or defrosted food, they will figure out what to do with the mossies.
It is possible to overfeed a tank to the point that some will hatch. But soft-bodied mosquitoes (the Chinese food of fish foods) will really be inhaled by many fish. I have seen somewhat digested mosquito larvae passing out of the digestive tract, so eager were the fish to swallow more. So long as I am squirting in only 5 to 10 per female guppy sized fish, there is little danger of them getting out, unless the plant tangle is unbelievable.
All the best!
unc
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