:roll:
Water Boatmen of New Zealand are non-predatory, dining on aquatic plants and algae instead of insects and vertebrates.
They use their straw-like mouthparts to inject saliva into plants.
The saliva digests the plant material, allowing the water boatman to suck the liquefied food back through their mouthparts and into their digestive tract.
A few species of water boatmen are predatory, but the majority are herbivorous. New Zealand ones however, are not predatory.
Damselfly nymphs are carnivorous, feeding on daphnia, mosquito larvae, and various other small aquatic organisms but usually not fish.