Blackline cucumberfish (Paraulopus melanogrammus) is a ray-finned fish of the family Paraulopidae. It inhabits marine (saltwater) waters in pelagic environments. This species can reach a maximum total length of 24.3 cm. It occurs at depths between 184 and 606 metres. With a trophic level of 4.1, it is a mid-level predator. It is assessed as Least Concern on the IUCN Red List.
Dorsal soft rays (total): 11; Anal soft rays: 9 - 10; Vertebrae: 47 - 49. This species is characterized by the following features: 15-17 (usually 16) pectoral-fin rays; 47-49 (usually 48) vertebrae; 4-5+15-17 (usually 16) gill-rakers, upper limb with 3 fully formed rakers and 1-2 rudiments; 47-49 (usually 48) lateral-line scales; 4.5 scales above lateral line; 3 rows of scales on cheeks; supraocular ridge above middle three-quarters of the eye; large eye 2.5-3.1 (mean 2.7) in head; moderately small adipose fin, 1.7-3.7% (mean 3.1%) SL; anal fin of moderate height, 20.1-24.9% (mean 22.7%) SL; pelvic fin is distinctly longer than pectoral fin; dorsal fin with distinctly black leading edge basally and distally in juveniles or along entire margin in adults .: elongated.
Behavioural data for Blackline cucumberfish is currently being reviewed.
Marine; pelagic-oceanic; depth range 184 - 606 m . Subtropical
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