Venom injection from modified salivary glands. Venom gland duct runs to base of fang. Compressor glandulae muscle compresses venom gland to eject venom into duct and to allow venom to enter hollow fang and from there into prey.
Escape behavior "tail flip" in trout. Fish body form allows for specialization in swimming abilities. Sculpin-undulates against water to produce thrust. Maneuvering-butterfly fish. Pike-quick lunges. Tuna-sustained swimming.