Red Sea clownfish

Amphiprion bicinctus, meaning "both sawlike with two stripes," commonly known as the Red Sea or two-banded anemonefish is a marine fish belonging to the family Pomacentridae, the clownfishes and damselfishes.[2] Like other species of the genus, the fish feeds on algae and zooplankton in the wild.[3]

Red Sea clownfish
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Family: Pomacentridae
Genus: Amphiprion
Species:
A. bicinctus
Binomial name
Amphiprion bicinctus
Rüppell, 1830

Characteristics of Anemonefish
Main article: Amphiprioninae (anemonefish)

Clownfish or anemonefish are fishes that, in the wild, form symbiotic mutualisms with sea anemones and are unaffected by the stinging tentacles of the host anemone, see Amphiprioninae § Symbiosis and mutualism. The sea anemone protects the clownfish from predators, as well as providing food through the scraps left from the anemone's meals and occasional dead anemone tentacles. In return, the clownfish defends the anemone from its predators, and parasites.[4] Clownfish are small-sized, 10–18 centimetres (3.9–7.1 in), and depending on species, they are overall yellow, orange, or a reddish or blackish color, and many show white bars or patches. Within species there may be color variations, most commonly according to distribution, but also based on sex, age and host anemone. Clownfish are found in warmer waters of the Indian and Pacific oceans and the Red Sea in sheltered reefs or in shallow lagoons.

In a group of clownfish, there is a strict dominance hierarchy. The largest and most aggressive fish is female and is found at the top. Only two clownfish, a male and a female, in a group reproduce through external fertilization. Clownfish are sequential hermaphrodites, meaning that they develop into males first, and when they mature, they become females.

Description

The fish's body is yellow-orange to dark brown. As the name suggests, the two-banded anemonefish has two white bands or bars, with black edges. The head-bar considerably wider. They have 9-10 dorsal spines, 2 anal spines, 15-17 dorsal soft rays and 13-14 anal soft rays.[2] Males grow to a length of 10 centimetres (3.9 in), and females grow to a length of 14 centimetres (5.5 in).[3]

Color variation

The principal variation is that the body can be yellow-orange to dark brown.[5]

Similar species

A pattern of two white bars is common to species within the clarkii complex sub genus. The yellow caudal fin of A. bicinctus distinguishes it from all but A. latifasciatus and some variations of A. clarkii, however A. clarkii has a white base with a sharp demarcation between light and dark. A. latifasciatus has a much wider mid-body bar and forked caudal fin. The caudal fin on A. allardi and A. chagosensis is white or whitish.[5]

Distribution and Habitat

The species is found in the Western Indian Ocean, the Red Sea, Socotra and the Chagos archipelago.[3][5][1]

Host anemones

The relationship between anemonefish and their host sea anemones is not random, instead being highly nested in structure. A. bicinctus is generalist, being hosted by the following 5 species of anemones: [5]

Studies conducted in the northern Red Sea have demonstrated that A. bicinctus has a preference for E. quadricolor over H. crispa and sexually mature fish are rarely hosted by H. crispa.[6][7] In 2005, anemone density was found to affect whether H. crispa hosted anemonefish, with clusters of juvenile fish only found at low density sites, while either 1 or no juvenile anemonefish were found in H. crispa at the high density site. The authors theorised that H. crispa was a nursery anemone due to being unable to adequately protect adult anemonefish from predation, active emigration of fish to E. quadricolor and/or environmentally-controlled cessation of fish growth.[6] A subsequent study in 2012 tested the nursery theory and concluded that the sea anemone H. crispa was a less-preferred host than E. quadricolor, and that fish preference appeared to be the result of body size, morphology, and behavior of the host.[7]

Images
  • Amphiprion bicinctus near Marsa Alam
  • Twoband anemonefish in the Red Sea
  • Amphiprion bicinctus in Gyrostoma
  • Pair of Red Sea Anemonefish

References
  1. Myers, R.; Rocha, L.A. & Allen, G. (2017). "Amphiprion bicinctus". IUCN Red List of Threatened Species. 2017: e.T188320A1857510. doi:10.2305/IUCN.UK.2017-2.RLTS.T188320A1857510.en.
  2. Froese, Rainer and Pauly, Daniel, eds. (2014). "Amphiprion bicinctus" in FishBase. November 2014 version.
  3. Lougher, Tristan (2006). What Fish?: A Buyer's Guide to Marine Fish. Interpet Publishing. p. 12. ISBN 978-0-7641-3256-8.
  4. "Clown Anemonefish". Nat Geo Wild : Animals. National Geographic Society. Retrieved 2011-12-19.
  5. Fautin, Daphne G.; Allen, Gerald R. (1992). Field Guide to Anemone Fishes and Their Host Sea Anemones. Western Australian Museum. p. 66. ISBN 978-0-7309-5216-9.
  6. Chadwick, N. E.; Arvedlund, M. (2005). "Abundance of giant sea anemones and patterns of association with anemonefish in the northern Red Sea". Journal of the Marine Biological Association of the United Kingdom. 85 (5): 1287–1292. doi:10.1017/S0025315405012440.
  7. Huebner L.K.; Dailey, B.; Titus, B.M; Khalaf M.; Chadwick, N.E. (2012). "Host preference and habitat segregation among Red Sea anemonefish: effects of sea anemone traits and fish life stages" (PDF). Marine Ecology Progress Series. 464: 1–15. doi:10.3354/meps09964.
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