Whirligig beetle:
These scavengers are found at the surface. Whirligigs take air bubbles below the surface to breathe. Not relying on dissolved oxygen to survive, whirligig beetlesare not necessarily a usefull indicator of water quality.

Predacious diving beetle - adult:
Has gone through complete metamorphosis. Diving beetles are strong and fast swimmers that breathe air from an air bubble trapped under it’s wing covers. Carnivorous, they feed on larvae and small fish. They are not good indicators of water quality because they breathe aurface air.

Caddisfly larvae:
These resemble caterpillars with skinny legs. Mostly they are
herbaceous, eating algae and plants. However, some are predators that eat nymphs. Caddisfly larvae, a favorite food of trout, are moderately tolerant of pollutants and warm water. Large numbers may indicate fair water quality.

Damselfly nymph:
With three paddle-shaped tails to power their movement, Damselfly
nymphs easily catch prey with an extendable lower lip. They feed on mayfly nymphs,mosquito larvae and whatever else is small enough to grab.

Mosquite pupa:
Called tumblers, pupa do not eat. This is a resting stage where the
animal prepares for metamorphosis into an adult mosquito.

Blackfly larvae:
With a dark coloured and swollen bottom end, the blackfly larvae
attahces to the smooth upper surface of rocks using suckers. If the population is large, the rock will appear breaded. Found in flowing water, this omnivore is pollutant tolerant.