Odontamblyopus tenuis

Odontamblyopus tenuis is a species of eel goby native to fresh, brackish and marine coastal waters from Pakistan and Myanmar. This species can reach a length of 12.8 centimetres.

ENVIRONMENT

• Marine; freshwater; brackish; benthopelagic; amphidromous, Tropical.

DIAGNOSIS
This species is easily distinguished from its congeners by the following features:

• A high number of pectoral-fin rays, ranging from 46 to 65 (mean: 59.5), the highest in the genus.

• An extremely elongated body, with a head length-to-standard length (HL/SL) ratio of 0.078–0.130 (mean: 0.114).

• A narrow head, with a head width-to-standard length (HW/SL) ratio of 0.040–0.059 (mean: 0.054).

• Barbels are present on the underside of the chin.

MORPHOLOGY

• Dorsal spines: 6

• Dorsal soft rays: 34-36

• Anal spines: 1

• Anal soft rays: 31-34

• Vertebrae: 27

• Key characteristics include rudimentary but distinct eyes covered by skin.

• The mouth is oblique, with barbels located on the underside of the chin.

• The pectoral-fin rays are free, silk-like, and range from 46-65 in number.

• Cycloid scales are embedded on both the head and body.

• Facultative air-breathing in the genus 

COLORATION

• This species has a "general roseate tinge," with colorless fins, except for the caudal fin, which is dark with a light outer edge.

• The dorsum of the head and body is dark brown to gray, while the rest of the head and body is uniformly pale or pale brown.

• There are faint black melanophores on the caudal-fin rays, the proximal part of the dorsal-fin rays, and occasionally on the dorsal spines.

• The pectoral, pelvic, and anal fins are nearly translucent. In larger specimens, the fanglike teeth on the outer rows of both jaws are often reddish-brown.