Hairy Frogfish

Quick Take

• The hairy frogfish strikes faster than almost any animal on Earth, and it does not use teeth to do it. See the suction feeding →
• This fish refuses to swim, and its fallback methods of getting around are stranger than you would expect. See how it walks →
• When a predator corners it, the hairy frogfish pulls off a physical trick that seems impossible for a fish its size. Discover the inflation defense →
• Its nighttime hunting strategy goes beyond its bizarre built-in lure, and most people are unaware of the hidden extra layer involved. Explore the built-in lure →

The hairy frogfish (Antennarius striatus), also known as the striated frogfish, is a species of anglerfish found in tropical and subtropical waters worldwide, except for the Arctic and the Mediterranean Sea. They inhabit rocky areas and coral reefs, where they use mimicry and camouflage to blend with their environments. This fish species does not swim like most. Instead, it uses its specialized fins to “hop” across the sea floor.

5 Amazing Hairy Frogfish Facts

• Hairy frogfish can eat prey as large as themselves by swallowing them whole.
• They feature angled fins that allow them to “walk” or “hop” along the ocean floor. They can also travel by expelling water through their gills.
• They use cryptic coloration to mimic coral and sponges, blending with their environment.
• Their color changes within a few weeks after moving to a new location.
• Frogfish are voracious eaters, consuming anything small enough that comes near their mouths.

Classification and Scientific Name

The hairy frogfish (Antennarius striatus) belongs to the class Actinopterygii in the order Lophiiformes, which encompasses the anglerfish. This order is known for its characteristic bioluminescent lure fin. The Antennariidae family consists of frogfishes, and the Antennarius genus comprises 11 species that live at the bottom of shallow waters in tropical and subtropical oceans. 

Appearance

The hairy frogfish is relatively small, measuring approximately eight inches in length and weighing slightly over one ounce. They have round, smooth bodies covered in irregular spines and large mouths that can extend to swallow prey as large as themselves. Their dominant colors are typically yellow, brown, and orange. However, their coloring varies greatly depending on their environment. And they can change their color and pattern within a few weeks of living in a new habitat. Their markings resemble elongated blotches or parallel stripes. 

Like other anglerfishes, the hairy frogfish has a dorsal spine, called an illicium, that tips forward like a fishing rod. The spine’s tip features a lure similar to a worm wiggling on a hook. They also have angled pectoral fins that allow the frogfish to keep a stable position before attacking its prey. Their specialized fins also help them “walk” along the ocean floor. They move quickly through their habitat by taking in water through their mouths and expelling it through gills located behind their pectoral fins, giving them jet-like propulsion. 

Distribution, Population, and Habitat

This species lives in tropical and subtropical waters in the Pacific Ocean, Atlantic Ocean, Indian Ocean, the Gulf of Mexico, and the Caribbean Sea. The only waters they do not inhabit are the Arctic and the Mediterranean Sea. They are also absent from the eastern Pacific. They primarily inhabit rocky areas and coral reefs, where you can find them on sand, rocks, and rubble. Hairy frogfish live near the surface and as deep as over 600 feet. However, their average depth is 130 feet. They use cryptic coloration to blend with their environment, often looking like coral and sponges. 

Evolution and History

Very few frogfish fossil remains have been discovered. However, several fossil species from the frogfish family were discovered in 2005 and 2006, placing their earliest ancestors between five and 56 million years ago. The hairy frogfish evolved through several modifications to thrive in its environment, such as its angled fins for walking and the dorsal fin used as a prey lure. 

Predators and Prey

Hairy frogfish are ravenous carnivores that will eat anything small enough to fit into their mouths. Their diet typically includes small fish, but they can swallow prey their own size, including other frogfish. They use their unusual dorsal fin as a lure and, at night, combine it with a chemical attractant to make it visible to prey. They have one of the fastest eating methods among animals. They lack teeth and use suction to grab their food. The frogfish waits for its prey to get close enough, opens its mouth wide, and inhales creatures within six thousandths of a second. 

The hairy frogfish has few natural predators. But some marine species, like lizardfish and scorpionfish, occasionally prey on frogfish. This species is a master of camouflage in its environment, employing Batesian mimicry, where it mimics dangerous species, like sea anemones. If that doesn’t deter their predators, they inflate their bodies to prevent creatures from swallowing them.

Reproduction and Lifespan

Females produce up to 180,000 eggs before mating, and males will nudge their abdomens when it’s time to begin. Both sexes swim to the surface, where the female releases her eggs in a ribbon-like mass of mucus, known as an epipelagic egg raft. The male fertilizes the eggs, and they remain floating for several days. Once the egg raft sinks to the bottom, the embryos are ready to hatch. Hairy frogfish can live up to 20 years, but their average lifespan is unknown.

Fishing and Cooking

Hairy frogfish are not game fish and are not used in cooking due to their unpleasant taste. However, they are used in the aquarium trade. 

Threats and Conservation Status

The IUCN lists the hairy frogfish as LC or “least concern.” Due to its extensive range and presence in common environments, this species does not meet the threshold for threatened status. They are not commercially fished but occasionally caught in the Caribbean for use in the aquarium trade. Their other threats include habitat loss and pollution.