Source: FAO 2002
| Family | Scientific Name | Author | Year | Common Name |
| Gempylidae | Nesiarchus nasutus | Johnson | 1862 | Black Gemfish |
Nesiarchus nasutus
Unique Characters: Dorsal-fin spines 17-21. Lateral line single, but not sinuous. Jaws with conical, fleshy tips. Pelvic fins well developed, with 1 spine and 5 soft rays. Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. 2 finlets behind both dorsal and anal fins. Body depth less than 10-13 times in standard length.
Similar Species:
Black Snake Mackerel
Nealotus tripes
Roudi Escolar
Promethichthys prometheus
Black Snake Mackerel Nealotus tripes. Lateral line obvious, straight long midside. Two free anal-fin spines behind anus, first of them large, dagger-shaped. Dorsal-fin spines 20 or 21. Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. 2 finlets behind both dorsal and anal fins. Pelvic fins rudimentary, of a single spine. Body depth 6.5-9 times in standard length.
Roudi Escolar Promethichthys prometheus. Dorsal-fin spines 17 or 18. Lateral line single, but not sinuous. Lateral line curved abruptly downward anteriorly. Pelvic fins rudimentary, of a single spine. Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. One lateral line. 2 finlets behind both dorsal and anal fins. Body depth 6.5-9 times in standard length. No free anal fin behind anus.
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