Saltcorner
By Bob Goemans
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Stegastes

Stegastes diencaeus

(Jordan & Rutter, 1897)

Longfin Gregory, Longfin Damselfish

Not Reef Tank Suitable

Not Suitable for Fish-Only Tank

Range: Western Atlantic Ocean: Southern Florida, Bermuda, and the Gulf of Mexico to northern South America.

Size: 6 inches (15 cm)

Natural Environment: Inhabits fringing reefs, lagoon coral heads or patch reefs, and back reefs at depths between 3 to about 15 feet (1– 5 m) where juveniles feed on zooplankton, and adults mainly feed on filamentous algae and somewhat on zooplankton.

General Husbandry: Rarely seen in the trade, and named for it extra long anal fin. Juveniles are quite attractive having a yellow body with blue on top of their head and dorsal, sometimes with blue stripes within the head area and a black eyespot edged in blue at the rear of the dorsal fin. Adults are quite drab, simply a dark greyish.

Best maintained by professional aquarists in large aquariums having live rock with growths of various forms of algae, hiding places, and very aggressive tankmates.

As to diet, plant material (adults main food in the wild), e.g., flake foods, especially those containing Spirulina and Nori, combined with most regular aquarium foods, e.g., live fortified brine shrimp and/or finely chopped various frozen or fresh meaty foods such as mysis, squid, fish flesh, shrimp, clam, etc., mainly for juveniles, should be offered once or twice daily.

Taxonomy: ul>

Order: Perciformes

Suborder: Labroidei

Family: Pomacentridae

Subfamily: Pomacentrinae

Genus: Stegastes

FYI: Mostly unsuitable for home aquariums, as this species is very aggressive, besides unattractive as an adult, and may kill its tankmates unless they are extremely aggressive and larger.

Experience Level: Professional

Temperament: Aggressive

Diet: Omnivore

Coral Safe: Yes

Invertebrate Safe: With caution

Acclimation Time: 30 minutes+

Aquarium Environment: Neither home reef or fish-only aquarium

Tankmates: Aggressive

Minimum Tank Size: 75 gallons

Temperature Range: 74 - 84°F (23 – 28°C)

Specific Gravity: 1.020 - 1.026

pH: 8.0 - 8.5

 Stegastes diencaeus (Longfin Gregory, Longfin Damselfish)
Photo © John Randall
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