Description
Ptereleotris evides (commonly known as the blackfin dartfish or scissortail goby) is a small, marine reef fish belonging to the family Microdesmidae (or Gobiidae).
Physical Description
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Size: Reaches a maximum length of about 14 cm (5.5 inches) total length.
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Shape: Elongated and laterally compressed, torpedo-like body with tapering dorsal and anal fins that give it an arrow-like or scissortail appearance.
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Coloration: The forebody is a light bluish-gray, transitioning dramatically to black or dark coloration toward the rear.
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Markings: Features an iridescent blue operculum (gill cover), dark or reddish caudal lobes framing a paler central tail area, and accent markings of blue and orange-red around the face and pectoral region. Juveniles have a distinct black spot near the lower base of the caudal fin.
Habitat and Distribution
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Range: Widely distributed across the Indo-Pacific region, spanning from the Red Sea and East Africa across to the Line and Society Islands, north to southern Japan (Ryukyu Islands), and south to Australia (New South Wales).
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Depth: Typically found at depths of 0 to 30 meters (most commonly 2 to 15 meters).
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Environment: Inhabits outer reef slopes, lagoons, and bays.
Behavior and Ecology
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Lifestyle: Monogamous and non-migratory; usually found living in pairs or small aggregations.
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Feeding: Hovers 1 to 2 meters above the substrate to feed on zooplankton.
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Conservation Status: Listed as Least Concern by the IUCN.
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Aquarium Care: Popular in marine aquariums due to its peaceful temperament and striking colors, though it is prone to jumping and requires a well-covered tank.
