scsims- From your description your "bugs" are adult insects in the Order Hemiptera (true bugs). They are either water boatmen (Family-Corixidae) or back swimmers (Fam -Notonectidae). Both have piercing mouth parts but the back swimmers more often tend to be predatory and the larger ones feed on other aquatic insects, small tadpoles, and small fishes. If these bugs are handled carelessly they can "sting" you sharply with their piercing mouth or beak. Swimmers sometimes complain of getting bit by these bugs in fishless ponds. Large fingerling, juvenile and adult panfish fish readily eat these bugs.

Ponds can have predaceous beetles that eat small fish but your description does not acurately describe them.

In fishless ponds I have seen water boatmen / backswimmer densities as high as about one per gallon of water.

Typically bass are stocked at 2"-4" long and they can eat these "bugs". Obviously from your description the adult bugs can eat some of the 3/4"-1" bass which is a good reason why not to stock real small fish (1/2"-1") in a fishless pond that has a lot of backswimers. Your bass survival may be poor and you may have to restock a few larger bass in the fall. Time and careful observation / sampling will answer this question.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management