Giant Frogfish
Antennarius commersonii

Commerson's frogfish is of the family Antennariidae (Frogfishes) and the order Lophiiformes (anglerfishes).

The Giant Frogfish has a variable colour, yellow, orange, brown, black, green. Relatively smooth skin peppered with small dark spots, or covered with fouling. Illicium longer than the 2nd dorsal spine, very fleshy, with a membrane not very appearent. 30 cm.
When it is not yet at the maximum size, it can be confused with Antennarius pictus and Antennarius maculatus. The former has skin with large dark spots mimicking the sponge oscules, the second has prominent warts. A. commersoni has smoother and more uniformly coloured skin. Larger specimens can be covered with fouling, but these are identified by the size.

The color of frogfishes is extremely variable; they generally match their surroundings very well. If the background color is changed, they may in a few weeks dramatically change color, as from red or yellow to black.

One of the interesting things about this fish is that its pectoral fins have evolved into limb-like appendages that have an "elbow" joint. The pectoral fins also are prehensile, that is, the fish can grab onto things with them. The frogfish uses its prehensile pectoral fins to hold onto the surface where it is perched.

Frogfish eat little crustaceans and other fish. They have really big mouths for their size, and they can engulf a fish longer than themselves. The frogfish family (Antennariidae) are among the fishes known as "anglerfish," because their first dorsal spine is adapted into a little lure that they can extend and wiggle above their mouths to attract prey.

Frogfish tend to have a very small range, since they don't swim around much. This means that once a diver has located a fish of this species, it's usually easy to find it again and again.

A Commerson's Frogfish can grow to about a foot (30 cm) in length.
corpaenidae, the scorpionfish, are a family of mostly marine fish that includes many of the world's most venomous species. As the name suggests, scorpionfish have a type of "sting" in the form of sharp spines coated with venomous mucus. The family is a large one, with hundreds of members.

General characteristics of family members include a compressed body, ridges and/or spines on the head, one or two spines on the operculum, and three to five spines on the preopercle. The dorsal fin will have 11 to 17 spines, often long and separated from each other, and the pectoral fins will be well-developed, with 11 to 25 rays. The spines of the dorsal, anal, and pelvic fins all have venom glands at their bases.

Most species are bottom-dwellers that feed on crustaceans and smaller fish. Most species inhabit shallow waters, but a few live as deep as 2,200 metres (7,200 ft). Most Scorpionfish, such as the stonefish, wait in disguise for prey to pass them by before swallowing, while lionfish often ambush their prey. When not ambushing, lionfish may herd the fish, shrimp, or crab in to a corner before swallowing. Scorpionfish feed by opening their mouth, then their gills a fraction of a second apart, creating suction. Stripers, grouper, bass, snook, frogfish, toadfish, sculpin, etc., also feed this way, but the scorpionfish, toadfish and sculpins are the only members of this group that have jaw teeth.
Trapeziid crabs actively defend their coral hosts from predators, and are known to drive away predatory Crown-of-Thorns Seastars by snipping off their thorns and tube feet. Trapezia live only on Pocillopora corals, and feed on their mucus.

Common Lionfish

Soldier Lionfish
Peterois miles