Microstoma microstoma (Risso, 1810)
Slender argentine
photo by Mac Eachern, W.J.

Family:  Microstomatidae (Pencil smelts)
Max. size:  21 cm TL (male/unsexed)
Environment:  bathypelagic; marine
Distribution:  Probably worldwide in tropical and subtropical seas. Eastern Atlantic: southern Ireland, scattered records in western Mediterranean, also Madeira Islands. Western Atlantic: Gulf of Mexico (Ref. 27768). Western Pacific: Australia (Ref. 7300) and New Zealand (Ref. 5755).
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 10-12; Anal spines: 0-0; Anal soft rays: 7-9; Vertebrae: 44-45. Body silvery, darker near tail (Ref. 3978). Swim bladder faintly colored. Adults mostly silver (Ref. 37473).
Biology:  Mesopelagic species (Ref. 3978, 58302). Generally solitary. Probably feeds on zooplankton. Spawns throughout the year in the Mediterranean, more in winter.
IUCN Red List Status: Least Concern (LC); Date assessed: 10 July 2014 Ref. (130435)
Threat to humans:  harmless


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