Animal Species:Larval basslet, Liopropoma sp

Fishes in the genus Liopropoma are generally very secretive, living in caves or crevices in coral reefs. They are generally small fishes that grow to less than 10 cm in length. Three species of Liopropoma occur in Australian waters. These are the Headband Perch, L. mitratum, Yellow Reef Basslet, L. multilineatum and Pinstripe Reef Basslet, L. susumi.

A larval basslet caught off Rottnest Island

Barry Hutchins © Barry Hutchins

Standard Common Name

A larval basslet

Identification

Larval Liopropoma have extremely long ornate second and third dorsal fin spines. These spines have balloon-like structures which are held above the fish.

Three species of Liopropoma occur in Australian waters. These are the Headband Perch, L. mitratum, Yellow Reef Basslet, L. multilineatum and Pinstripe Reef Basslet, L. susumi.

Size range

Basslets generally grow to less than 10 cm in length.

Distribution

The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums.  Source: Atlas of Living Australia.

Liopropoma sp

Distribution by collection data

Ozcam map of Larval basslet specimens in the Australian Museums.

What does this mean?

Habitat

Fishes in the genus Liopropoma are generally very secretive, living in caves or crevices in coral reefs.

Other behaviours and adaptations

Why the fish has ornate dorsal fin spines is not certain.  The Smithsonian’s ‘Expedition to Galapagos’ website states that “We don’t know the precise function of these structures, but they look very much like a type of colonial jellyfish known as a siphonophore. Perhaps they look enough like them to deter certain potential predators.” Baldwin et al (1991) state that “The elongate filaments could play a role in energy storage by providing space for the assimilation of excess food; however, long, trailing filaments seem an unlikely place for energy storage because they probably are quite vulnerable to predation. In fact, pigmented swellings or other variations in the shape of the filaments could attract predators, distracting them from the body of the larva. The elongate filaments also might function in predator deception by increasing the apparent size of the lava.”

Classification

Species:
sp
Genus:
Liopropoma
Family:
Serranidae
Order:
Perciformes
Class:
Actinopterygii
Subphylum:
Vertebrata
Phylum:
Chordata
Kingdom:
Animalia

What does this mean?

References

  1. Baldwin , C. C, Johnson, G. D. and P. L. Colin. 1991. Larvae of Diploprion bifasciatum, Belonoperca chabanaudi and Grammistes sexlineatus (Serranidae: Epinephelinae) with a comparison of known larvae of other epinephelines. Bulletin of Marine Science 48: 67-93.
  2. Leis, J.M. and B.M. Carson-Ewart. (editors). 2000. The larvae of Indo-Pacific coastal fishes. An identification guide to marine fish larvae. (Fauna Malesiana Handbooks 2). E.J. Brill, Leiden. Pp. 870.

 


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Tags fishes, ichthyology, basslet, larva, Liopropoma, Serranidae, coral reef, secretive, caves, crevices, < 10 cm, long ornate dorsal fin spines, balloon-like structures, marine,