Tag Archive: Mouthbrooders

Phylum: Chordata
Class: Actinopterygii (ray-finned fishes)
Order: Perciformes (Perch-likes)
Family: Opistognathidae (Jawfishes)

Genus/species: Opistognathus randalli

GENERAL CHARACTERISTICS Has two large bulging eyes to peak to of its burrow. They use their large mouths to dig the burrow and reinforce the walls with stones and shells.

Length up to 10.4 cm (4 inches)

DISTRIBUTION/HABITAT: Found in the tropical marine Western Pacific: pelagic-sublittoral zone; the part of the ocean extending from the low tide mark to the edge of the continental shelf, with a relatively shallow depth extending to about 200 meters. They are located in the sand/rubble bottoms near reefs.

Depth range 5 – 32 m (16-105 ft)

DIET IN THE WILD: Small crustaceans, fish and invertebrates

REPRODUCTION: Jawfish are mouthbrooders. Males of this species are strongly territorial and frequently engage in jaw locking combat.

IUCN Not evaluated.


California Academy of Sciences, Steinhart Aquarium Hidden reels 2018

fishbase fishbase.org/summary/Opistognathus-randalli.html

Ron’s flickr  https://www.flickr.com/photos/cas_docents/40146951615/in/album-72157659465376212/

Ron’s WordPress Shortlink. https://wp.me/p1DZ4b-1X8

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii (ray-finned fishes)
Order: Perciformes (Perch-likes)
Family: Apogonidae (Cardinalfishes)

Genus/species: Sphaeramia orbicularis

GENERAL CHARACTERISTICS: The Orbicular Cardinalfish color is greenish grey with silvery reflections. A narrow dark mid body vertical bar is present from the origin of spiny dorsal fin to just in front of anus. There are variable-sized scattered spots on rear of the body. The pelvic fins have a dark bar.

Length up to 11.5 cm (4.5 inches).

DISTRIBUTION/HABITAT: S.orbicularis is native to the Indo-Pacific, E. Africa to Figi, S.W. Japan to New Caledonia. Found in coastal waters among mangroves, rocks, debris and piers. Depth to 3 meters.

DIET IN THE WILD: It feeds at night on planktonic crustaceans.

REPRODUCTION: Like all cardinalfishes they are paternal mouthbrooders.

CONSERVATION: IUCN 2006 Red List; Not evaluated.


California Academy of Sciences Steinhart Aquarium Mangrove Pop-Up, Main floor (level one) 2018

Ron’s flickr  https://www.flickr.com/photos/cas_docents/39777042992/in/album-72157675807621922/

fishbase www.fishbase.org/summary/4926

Encyclopedia of Life eol.org/pages/221177/details

Reef Fish ID Tropical Pacific, Allen et/al 2003, page 266.

Ron’sWordpress shortlink wp.me/p1DZ4b-1Uj

%d bloggers like this: