Cairns rainbow fish
| Cairns rainbow fish | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Cairnsichthys | ||||||||||||
| Allen , 1980 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Cairnsichthys rhombosomoides | ||||||||||||
| ( Nichols & Raven , 1928) |
The Cairns rainbow fish ( Cairnsichthys rhombosomoides ) is an Australian freshwater fish from north Queensland .
features
Cairns rainbow fish are yellowish-brown in color and have a narrow, dark stripe in the middle of the body from head to tail as well as a large silvery-yellowish spot on the gill cover . Males have longer dorsal and anal fins with yellowish-orange fin edges and caudal fins with yellow-orange edges and are more vividly colored compared to the paler females. The slender fish reach a standard length of 8.5 cm (males) or 6.5 cm (females).
Fin formula : Dorsal V-VII + I, 11-14; Anal 1.17-21; Pectorals 11-13
Distribution and habitat
The Cairns rainbow fish is endemic to the wet tropics of northern Queensland at the base of rainforest-clad mountains in the Cairns area . It lives in small, permanent, relatively fast-flowing rainforest streams with scouring below 100 meters. The water depth varies from a few centimeters to a few meters. The bottom of the water consists of stones, rubble, gravel and sand. There are practically no aquatic plants in the habitat, but there are roots and dead wood.
The Cairns rainbow fish is listed as "Endangered" on the IUCN Red List of Endangered Species . On the one hand, its distribution area is limited and fragmented, on the other hand it is partly in the Bellenden Ker Range, most of which is protected as a national park.
Way of life and reproduction
The Cairns rainbow fish feeds omnivorously , presumably mainly on insects and their larvae, small crustaceans and algae.
Spawning was observed from April to December, but mostly from August to October. Like all rainbow fish , Cairns rainbow fish are free-spawners ; their eggs, which are just over a millimeter in size and numerous, are expelled between aquatic plants, roots or leaves and stick there. The 3.5 to 5.5 mm long larvae hatch after about a week.
literature
- H.-H. Boeck: Cairnsichthys rhombosomoides - a gray mouse among the rainbow fish ? AMAZONAS 21, 50–53 ( pdf )
Individual evidence
- ↑ Cairns Rainbowfish at www.fishesofaustralia.net.au (accessed March 30, 2016)
- ↑ Wager, R. 1996. Cairnsichthys rhombosomoides. The IUCN Red List of Threatened Species 1996: e.T3461A9877712. doi : 10.2305 / IUCN.UK.1996.RLTS.T3461A9877712.en
Web links
- Cairns Rainbow Fish on Fishbase.org (English)
- Cairns Rainbowfish on "Fishes of Australia" (English)
- Adrian R. Tappin: Cairnsichthys rhombosomoides on "Home of the Rainbowfish" (English)