| Family | Scientific Name | Author | Year | Common Name |
| Xiphiidae | Xiphias gladius | Linnaeus | 1758 | Swordfish |
Xiphias gladius
Unique Characters: A large fish of rounded body in cross-section, very robust in front. Snout ending in a long, flattened, sword-like structure. A single, strong, lateral keel on each side of caudal peduncle. A deep notch each dorsally and ventrally just in front of base of caudal fin. Eyes large. Scales absent in adults but peculiar scale-like structures present in young, gradually disappearing with growth. Lateral line exists in young and juveniles, but disappearing with growth. Back and upper sides brownish black, lower sides and belly light brown.
Similar Species: None.
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