Pipa fish: The scientific name is angler fish, commonly known as stutter fish, frog fish, sea frog fish, pipe fish, etc. It is a bony fish belonging to the order Angleridae and the family Angleridae. It is a cosmopolitan fish and is distributed in the Atlantic, Pacific and Indian Oceans with various species.

The angler fish (scientific name: angler fish), also known as the "electric fish", is a strange-shaped fish that lives in the ocean. The body length is generally 45 cm, and the longest can be 2 meters. The body color varies from brown-green to gray-black, and there are also mottled spots on the body surface. The anglerfish has a flat body, a large head, well-developed dorsal and pectoral fins, and a long tail like a riding crop. There is a row of sharp spines at the junction between the tail root and the fish body, and the tips of the spines can produce venom. Looking down from the back of the fish body, it looks like a lute, so it is called "pipa fish".

Introduction:

The angler fish is a benthic fish, generally living at a depth of 2 meters to 500 meters below the sea level, and likes gravel substrate. Angler fish feed on a variety of small fish or juvenile fish. When it comes to preying, we have to talk about the unique "predation tool" of the angler fish.

There is usually a fishing rod-like structure on the snout on the female's head. The "fishing rod" has a fleshy protrusion at the end that looks like a worm, and the anglerfish uses it to lure other voracious fish. Because the angler fish lives in deep seas that lack light, there is usually a light organ at the end of the "fishing rod" that emits cold light to help the angler fish lure other fish. Therefore, the Pipa Fish is also called the "Electric Fish".

The anglerfish has two dorsal fins. The first dorsal fin is different from that of ordinary fish, consisting of 5 to 6 independently separated fin spines (6 for the yellow angler and 5 for the black angler). The first two tips are located on the back of the snout. There is a cortical spike at the top. The second dorsal fin and brachial fin are both located at the tail. The pectoral fins are wide, sideways, rounded, and have an arm-like base, which helps the body glide. The pelvic fin is short and positioned at the throat. Caudal fin rounded. The body is naked and scaleless, and there are cortical protrusions of different sizes on the top of the head and body and on the edges of the body. This kind of angler is only 10 centimeters in length. It is unlikely to encounter prey in the deep sea, so it tries to swallow food larger than itself. The sharp teeth are pointed inward so that once prey is caught, it cannot escape. The anglerfish doesn't swim much and has few opportunities to catch prey. During the long-term evolution process, its dorsal fin has changed: the first dorsal fin gradually extends toward the head, and the first three spines of the dorsal fin separate into silk fins in front of the head. It has a glowing flap at the end. When a small fish swims near the flashing point, the anglerfish shakes its fishing tackle to attract the fish to the bait and bring it into its mouth. The anglerfish has a huge appetite, and its stomach is often filled with sharks and other fish. It grows in the depths of the dark sea, moves slowly, and does not live in groups. It is difficult for male fish to find female fish in the vast ocean. Once they meet a female fish, they will stay with her for life until death, and the male fish's life's nutrition will also be lost. Supplied by female fish. Over time, anglerfish have developed this unique pair bond. The Johnson's angler's stomach is very distended, allowing it to swallow even large prey. The front half of the body is flat and disc-shaped, and the tail is cylindrical. The body is generally 40 to 60 cm long and weighs 300 to 800 grams. The head is particularly large and flat, the mouth is wide, there are black and white markings in the mouth, and there are 1 to 2 rows of canine teeth on the lower jaw. The body is soft, scaleless, brown on the back and off-white on the belly. There are many cortical protrusions on the edges of the head and body. There are 6 separate fin spines in the front of the dorsal fin. The first spine is located on the back of the snout and has a cortical spike at the top; the pectoral fin is wide and arm-like on both sides of the body; the anal fin has 8 to 11 rays. Each fin is dark brown.

The exact mechanism of anglerfish's glow is not yet fully understood. Currently, there is a view that the anglerfish's light-emitting organ contains a substance called "luciferin", which can emit luminescence under the oxidation of luciferase.