Dark-night luminous roughy

📖 Overview

Dark-night luminous roughy (Aulotrachichthys nyx) is a ray-finned fish of the family Trachichthyidae. It inhabits marine (saltwater) waters in deep-water environments. This species can reach a maximum total length of 8.3 cm. It occurs at depths between 195 and 200 metres. With a trophic level of 4.1, it is a mid-level predator.

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 5; Dorsal soft rays (total): 13; Anal spines: 3; Anal soft rays: 8; Vertebrae: 27. This species is disinguished from its congeners by having the following set of characters: striated area extending posteriorly, slightly beyond middle point on the caudal peduncle, its length 66.7% caudal-peduncle length; D V,13; A III,8; gill rakers on first gill arch 6 + 1 + 14 = 21; abdominal scutes 9; lateral-scale rows 58; body height 34.1% SL; pelvic-fin-anal-fin length 30.3% SL; forehead height 2 4.1% SL; pectoral-fin length 18.1% SL; dorsal-fin-anal-fin length 42.6% SL; dorsal-fin length 35.3% SL; postdorsal length 29.6% SL; length between the end of the anal-fin base to the end of the striated area (A-SA length), 12.4% SL. Colouration: body overall dark-brown, with chest, isthmus, and abdominal scutes uniformly black, and a distinct black vertical line along caudal-fin base (Ref, 129295),Cross section: compressed.

🌀 Behaviour

Behavioural data for Dark-night luminous roughy is currently being reviewed.

🦐 Diet

Diet information for Dark-night luminous roughy is currently being compiled.

🥚 Reproduction

Reproduction data for Dark-night luminous roughy is currently being compiled.

🌍 Habitat & Distribution

Marine; bathypelagic; depth range 195 - 200 m . Subtropical Northwest Pacific: eastern Taiwan.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

📊 Population Risk & Fisheries

🐠 Related Species

🔍 Similar Species

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