Dascyllus trimaculatus - Domino Damselfish

Dascyllus trimaculatus
Domino Damselfish
Threespot Dascyllus

Morphology:

Dorsal spines (total): 12 - 12; Dorsal soft rays (total): 14 - 16; Anal spines: 2; Anal soft rays: 14 – 15. Juveniles overall black with scale centers bluish; white blotch on forehead and upper sides; all fins black except the transparent pectoral and outer portion of soft dorsal rays. Geographic and behavioral color of adults variable; no spot on forehead; spot on upper sides very reduced; head and fins normally black; scales with black margins. Margins of preorbital, suborbital and preoperculum finely serrated.

Biology:

Inhabits coral and rocky reefs, juveniles often commensal with large sea anemones, sea urchins, or small coral heads (Ref. 4391, 48636). Occurs in small to large aggregations. Stomach contents include algae, copepods, and other planktonic crustaceans.

---

Seen at: Onna, Maeda, Kadena Seawall,

Stonogobiops nematodes - Blackray shrimpgoby

Hirenaga Nejirinbou
Stonogobiops nematodes
"Blackray shrimpgoby" or "Filament-finned prawn goby"

Seen: Maeda Misaki / Maeda Point
Family: Gobiidae (Gobies)
Order: Perciformes (perch-likes)
Class: Actinopterygii (ray-finned fishes)

Morphology:
Dorsal spines (total): 7 - 7; Dorsal soft rays (total): 12 - 12; Anal spines: 1; Anal soft rays: 11; Vertebrae: 26. Bright yellow from top of head to chin including most of iris; 2nd dorsal fin and caudal fin translucent yellow, both with diffuse light blue submarginal band and 4-5 rows of elliptical dark-edged blue spots; anal and pointed pectoral fins with yellowish rays. Naked thorax and pectoral base. Head pores absent. Dark head band ending on lower margin of preoperculum. Median predorsal region naked. Eye and mouth large. Angle of jaws 25 degrees. Longitudinal scale series 84, transverse 21. 1st 2 elongated spines and its membrane black.

Biology:
Occurs in pairs and live symbiotically with Alpheus randalli. The pair hover above the burrow's entrance on dark, sandy bottoms. Inhabits deep coastal slopes and sand flats, usually in depth over 10 meters (Ref. 48637).