Source: FAO 2002.
| Family | Scientific Name | Author | Year | Common Name |
| Hemiramphidae | Hyporhamphus roberti | (Valenciennes) | 1847 | Slender Halfbeak |
All Hyporhamphus species: Dorsal-fin soft rays 12-17; anal-fin soft rays 14-17. Pectoral fins short to moderate. Pectoral-fin soft rays 9-12. Lower jaw distinctly elongate. Total gill rakers on first arch 25-46. Pectoral-fin soft rays usually 7-12. Caudal fin emarginate or only slightly forked. Scales present on snout; preorbital ridge well developed
Hyporhamphus roberti
Unique Characters: Scales absent from dorsal and anal fins or only a few present on anterior parts of the fins.
Similar Species:
False Silverstripe, Hyporhamphus meeki. Lower jaw distinctly elongate. Total gill rakers on first arch 25-46. Pectoral-fin soft rays usually 7-12. Dorsal-fin soft rays 12-17. Pectoral fins short to moderate; pectoral-fin soft rays 9-12. Caudal fin emarginate or only slightly forked. Scales present on snout. Preorbital ridge well developed. Anal-fin soft rays usually 14-17. Total gill rakers on first arch 31-40, usually 33-39; on second arch 20-30, usually 25 or more. Ratio of preorbital length to orbit diameter usually greater than 0.70.
Atlantic Silverstripe Halfbeak, Hyporhamphus unifasciatus. Lower jaw distinctly elongate. Total gill rakers on first arch 25-46. Pectoral-fin soft rays usually 7-12. Dorsal-fin soft rays 12-17. Pectoral fins short to moderate; pectoral-fin soft rays 9-12. Caudal fin emarginate or only slightly forked. Scales present on snout. Preorbital ridge well developed. Anal-fin soft rays usually 14-17. Total gill rakers on first arch 26-35, usually 28-32; on second arch 19-28, usually 25 or fewer. Ratio of preorbital length to orbit diameter usually less than 0.70.
