Blackedged Angelfish (Genicanthus watanabei)
| Blackedged Angelfish Genicanthus watanabei | |
|---|---|
 | |
| Name | Blackedged Angelfish |
| Name Lat. | Genicanthus watanabei |
| Family | Angelfishes |
| Family lat. | Pomacanthidae |
| Order | Surgeonfishes |
| Order lat. | Acanthuriformes |
| Origin | Pacific |
| Habitat | Seaward reefs |
| Diet | Planktivore |
| pH | 8.1-8.4 |
| Hardness | 8-10 °KH |
| Behavior | Peaceful |
| Keeping | Pair, harem |
| Reef Compatible | Yes |
| Care Level | Moderate |
| Life Span | 10-12 years |
| Protection | No |
| Metric Units | |
| Size | 15 cm |
| Temperature | 20-26 °C |
| Salinity | 33-36 ‰ |
| Aquarium | ~ 500 l |
| US Units | |
| Size | 6" |
| Temperature | 68-79 °F |
| Salinity | 1.020-1.025 sg |
| Aquarium | ~ 130 gal |
Distribution and habitat
The distribution area of the swimming Genicanthus watanabei is the entire tropical Pacific Ocean, from Australia via Hawaii and New Caledonia to the west coast of Central America. There they live preferentially on deep steep slopes on the outer reef up to 80 m depth.
Maintenance
They need a well-structured aquarium with a reef structure that offers hiding, resting and covering possibilities, with living stones that they can graze on and that act like a biological filter as well as a lot of swimming space. Only lime-rich, heavy metal-free sands, gravels, stones or sea sand of various grain sizes may be used as substrate
Filters, skimmers and heaters are necessary to ensure water quality, as well as pumps to simulate tides, swells and bottom currents. Lighting must correspond to the species-appropriate day-night rhythm of the animals
| Salinity: 33-36 ‰ | pH value: 8.1-8.4 |
| Carbonate hardness: 8-10 °KH | Nitrate content: 2-8 mg/l |
| phosphate content: 0.01-0.1 mg/l | nitrite content: 0.0-0.05 mg/l |
For salinity, an average value should be aimed for, which may only vary slightly by +/- 0.5 ‰. Ammonia and ammonium must not be measurable. Special attention must be paid to constantly good water quality.
Diet
They feed mainly on zooplankton. The feed conversion does not always succeed without problems. The food supply should consist of a commercially available, vitamin-enriched frozen special food mix for planktivores or a combination of algae (e.g. spirulina, kelp) with live and frozen food, such as small mysis, plankton, bosmids and artemia, as well as live cyclops, which also serve to keep them busy. It is recommended to feed small portions several times a day (3-5 times)
Regular and varied feeding promotes health and increases resistance.
Behaviour and compatibility
It is recommended to keep them in pairs or one male with several females. Several females can also be added to the aquarium at the same time, in which case the largest, dominant animal will develop into the male. They are territorial and can be aggressive towards other angelfish. They are usually peaceful towards other fish.
Sex dimorphism
They are protogynous hermaphrodites, i.e. most males develop from functional females. The male has longitudinal stripes on the lower half of the body.
Reproduction and breeding
There are no known reports of successful breeding in the aquarium.
Important
As reef dwellers, they should not be kept in a fish-only aquarium. When kept in pairs and fed frequently as well as variedly, they can be maintained in challenging coral tanks without serious attacks on the corals. In case of boredom due to poorly structured swimming space (few living stones, low reef surface) they often develop stereotypies.
If different species are kept together, care should be taken to ensure that the fish match each other in terms of water quality and temperature requirements and social behavior, and that the setup meets the needs of all species kept together. New fish to be introduced must be acclimated slowly to the water in the aquarium
Further literature can be found in your pet store.
References
Text: Werner Winter; Image: Franz Lowak
Source: KUITER, DEBELIUS (2007): Atlas der Meeresfische: Die Fische an den Küsten der Weltmeere, Kosmos Verlag; PATZNER & MOOSLEITNER (1999): Meerwasser Atlas Bd. 6, Mergus Verlag; ENGELMANN (2005): Zootierhaltung - Tiere in menschlicher Obhut: Fische, Verlag Harri Deutsch
- Gemäß § 21 Abs. 5 Tierschutzgesetz idgF