Billfish
Billfish
Billfish (/ˈbɪlfɪʃ/; from Middle English bill, meaning "sword" + fish) are a group of predatory fish characterized by their long, slender bills or rostrums. They are an important species in both commercial and recreational fishing due to their size, speed, and challenge they pose to fishermen.
Etymology
The term "billfish" is derived from the Old English bill, meaning "sword", and fish, referring to the sword-like bill or rostrum that characterizes these species. The name is a direct reference to the distinctive shape of their upper jaw, which is elongated into a spear or sword-like structure.
Species
Billfish include several species of fish in the family Istiophoridae, which includes the marlin, sailfish, and spearfish. Another species, the swordfish, belongs to the family Xiphiidae.
Marlin
The marlin is a large species of billfish known for its elongated body, a spear-like snout or bill, and a long, rigid dorsal fin which can be raised or lowered depending on if it is swimming.
Sailfish
The sailfish is another species of billfish known for its distinctive dorsal fin or "sail", which often stretches the entire length of the back and is covered with spots and bars.
Spearfish
The spearfish is a smaller species of billfish. It is characterized by its short bill and slender body.
Swordfish
The swordfish is a large, highly migratory, predatory fish characterized by a long, flat bill. It is a popular sport fish of the billfish category.
Related Terms
- Rostrum: The bill or beak of a bird, but in this context, the elongated, pointed snout of a billfish.
- Istiophoridae: The family of fish that includes marlin, sailfish, and spearfish.
- Xiphiidae: The family of fish that includes the swordfish.
External links
- Medical encyclopedia article on Billfish
- Wikipedia's article - Billfish
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