Australian blenny

The Australian blenny (Ecsenius australianus) is a small marine blennioid fish of the genus Ecsenius. They are small and reddish brown with a white ventral side. Australian blennies inhabit the shallow marine waters of the tropics.[2] They are often found along the Great Barrier Reef and Coral Sea of Australia.

Australian blenny
A small fish with two lateral orange stripes and large eyes on a blunt head is perched upon a coral outcropping.
Australian blenny in East Timor
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Blenniiformes
Family: Blenniidae
Genus: Ecsenius
Species:
E. australianus
Binomial name
Ecsenius australianus

Taxonomy

This species is believed to be most closely related to E. fourmanoiri.[3] Similarities between these two species include "broad, darkly dusky bands and stripes" and "dark opercular margin[s]", which are not found in other members of the "Opsifrontalis Group".[3] Preserved specimens also bear similarity to E. opsifrontalis. However, E. australianus differ from E. opsifrontalis and E. fourmanoiri by their number of fins rays and vertebrae.[3]

Description

Australian blennies are small fish, reaching lengths of only 6 centimetres (2.4 in).[4] The dorsal two-thirds of the body is reddish-brown, with white spots forming two rows. The ventral third is white in colour.[2] A reddish-brown stripe with white edges passes from the rear end of the operculum (gill covering) through the eyes.[2] The colour of the stripes can vary by specimen, between bright orange-red and pinkish brown. Towards the posterior end, colouration turns grey.[3]

The dorsal fin has twelve spines and 13–15 soft rays.[3] The anal fin has two spines and 15–17 soft rays. The pectoral fin usually has 13 soft rays but can occasionally have 14. The tail (caudal) fin possesses 14 rays.[3]

Australian blennies are oviparous and lay eggs. The eggs develop at the bottom of the body of water and are adhesive.[4]

Distribution and habitat

Australian blennies are distributed in the western Pacific Ocean, occurring in the Great Barrier Reef and Coral Sea.[2] They are associated with coral reefs and occur in shallow waters along the northern Great Barrier Reef of Australia.[4] Whilst they are currently restricted to the northern Great Barrier Reef region, their range may expand southwards with those of several other similarly distributed species as temperatures increase due to climate change.[5]

References
  1. Williams, J.T. (2014). "Ecsenius australianus". IUCN Red List of Threatened Species. 2014: e.T48342230A48348505. doi:10.2305/IUCN.UK.2014-3.RLTS.T48342230A48348505.en. Retrieved 20 November 2021.
  2. "Australian Blenny, Ecsenius australianus (Springer, 1988)". Australian Museum. June 2009. Archived from the original on 23 October 2009. Retrieved 8 April 2010.
  3. Springer, Victor G. (1988). "The Indo-Pacific Blenniid Fish Genus Ecsenius". Smithsonian Contributions to Zoology. Washington, D.C.: Smithsonian Institution Press. 465 (465): 82–90. doi:10.5479/si.00810282.465.
  4. Froese, Rainer; Pauly, Daniel (eds.) (2010). "Ecsenius australianus" in FishBase. January 2010 version.
  5. Munday, Philip L.; Geoffrey P Jones; Marcus Sheaves; Ashley J Williams; Gillian Goby. "Vulnerability of fishes of the Great Barrier Reef to climate change" (PDF). p. 375. Archived from the original (PDF) on 6 July 2011. Retrieved 8 April 2010.
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