The Order Batrachoididae contains just one family (Batrachoididae) with is split into several generas and sub families with approximately 70 species within it, one of which we see regularly in Sydney.
They are all ambush predators that sit on the sandy / muddy bottom floor awaiting their prey which can be both invertebrates and other fishes. They all are well camouflaged with big lips, big eyes with whiskers and have pelvic fins far forward and two dorsal fins. Some families live in freshwater, estuaries and others live in marine ocean/sea environments.
This is a common family of fish in Sydney seen during most dives and at most locations.More information and pictures of these species are available in the page 'Frogfish'.