Ocellaris clownfish

The ocellaris clownfish (Amphiprion ocellaris), also known as the false percula clownfish or common clownfish, is a marine fish belonging to the family Pomacentridae, which includes clownfishes and damselfishes. Amphiprion ocellaris are found in different colors, depending on where they are located. For example, black Amphiprion ocellaris with white bands can be found near northern Australia, Southeast Asia, and Japan.[2] Orange or red-brown Amphiprion ocellaris also exist with three similar white bands on the body and head. Amphiprion ocellaris can be distinguished from other Amphiprion species based on the number of pectoral rays and dorsal spines. Amphiprion ocellaris are known to grow about 110 mm long.[3] Like many other fish species, females are, however, larger than males.[2] The life cycle of Amphiprion ocellaris varies in whether they reside at the surface or bottom of the ocean. When they initially hatch, they reside near the surface. However, when Amphiprion ocellaris enter into the juvenile stage of life, they travel down to the bottom to find shelter in a host anemone.[4] Once they find their anemone, they form a symbiotic relationship with them.[2][5]

Ocellaris clownfish
Specimen from the Mystic Aquarium
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Family: Pomacentridae
Genus: Amphiprion
Species:
A. ocellaris
Binomial name
Amphiprion ocellaris
Cuvier, 1830[1]
Synonyms

Amphiprion bicolor Castelnau, 1873
Amphiprion melanurus Cuvier, 1830

Phylogeny
Purple anemone (Heteractis magnifica) and resident anemonefish (Amphiprion ocellaris) in East Timor.

The species Amphiprion ocellaris belongs to the class Actinopterygii which contains bony Teleost fish and other ray-finned fish. A. ocellaris is the most basal species in the genus Amphiprion which is closely related to the genus Premnas. The species' most closely related ancestor is Amphiprion percula, the Orange clownfish. It is thought that A. ocellaris specialized after diverging from the genus Premnas, and scientific evidence confirms that all clownfish belonging to the genus Amphiprion initially could withstand the stings of only one type of anemone; after further speciation the 28 different species of clownfish including A. ocellaris have specialized to be able to resist the poisonous stings of many different anemone species.

Description

The common clownfish is a small fish which grows up to 11 cm (4.3 inches).[3] Its body has a stocky appearance and oval shape. It is compressed laterally, with a round profile. The coloration of its body is orange to reddish-brown, but it can also be black in some particular areas such as the Northern Territory in Australia.[6][7] It has three vertical white stripes outlined with a fine black line. The first passes just behind the eye, the second in the middle of the body widens forward to the head centrally and the third one circles the caudal peduncle.[3] All the fins are also outlined with a fine black line. A. ocellaris is often confused with Amphiprion percula, which possesses exactly the same colours and patterns at first sight but distinguishes itself by the thickness of the black outlines.[8] Additionally, A. ocellaris has a taller dorsal fin, and typically possesses 11 dorsal-fin spines vs. 10 spines in Amphiprion percula.[9]

Distribution and habitat

This species is found in the Eastern Indian Ocean and in the western Pacific Ocean.[3] As mentioned earlier, they can also be found in Northern Australia, Southeast Asia and Japan.[2]

Amphiprion ocellaris typically lives in small groups on outer reef slopes or in sheltered lagoons at a maximal depth of 15 meters. It inhabits three different species of sea anemones: Heteractis magnifica, Stichodactyla gigantea and Stichodactyla mertensii and have symbiotic relationships with the anemone.[2][5][10]

Behavior

A. ocellaris is a diurnal fish. It is a protandrous hermaphrodite, which means the male can change its sex to female during its life, and lives in a harem in which an established dominance hierarchy manages the group and keeps individuals at a specific social rank. It is aggressively territorial and is completely dependent on its sea anemone.[10]

Shelter

A. ocellaris are reliant on sea anemone for shelter (they have a symbiotic relationship with the sea anemone). Sea anemone are protection for the fish and their nests. This is because when A. ocellaris are in the open waters, they have a higher risk of predation. It is postulated that the fanning behavior of the fish and removal of parasites promotes the health of sea anemones which contain A. ocellaris fish. In addition, the anemone provides protection for the fish with its tentacles, however, the fish's mucus protection prevents it from being stung by the tentacles.[2][5] The presence of the clownfish can be interpreted as a lure to attract potential anemone's preys close to the tentacles. And the clownfish can also defend the anemone against some reef fishes which could eat the tentacles.[10]

Social system

Social systems can be defined as society considered as a system organized by a characteristic pattern of relationships.[11] A. ocellaris form specific social hierarchies within their societies. These social hierarchies result in competition to travel between the different levels of society, which is seen between various ages as well.

Queue selection

Queues is the term for social groups of A. ocellaris. This is because these fish form social hierarchies, or social rank, by “outliving” the more dominant members of the group. The dominant pair of each queue reproduces more compared to the subordinate fishes. This is the reason for why these individuals should adopt various tactics in which they increase their probability of attaining social dominance. There are two types of A. ocellaris, settlers and switchers. Settlers prefer shorter queues, while switchers will usually move after settlement. However, studies show that there is no difference in the characteristics between switchers and non-switchers, and there is no data demonstrating that A. ocellaris utilize the switching tactic for dominance. Although settlement preferences increase the likelihood of gaining social dominance, switching could have the function of increasing social dominance benefits after social dominance has been acquired.[12]

Juvenile Amphiprion ocellaris

Juvenile A. ocellaris have difficulty finding a sea anemone to live in (since they need anemone for survival and shelter). The difficulty also arises in the fact that there exists a hierarchy in each anemone. Thus, when a new juvenile enters an anemone, it begins at the bottom of the social ladder where it is often the victim of aggression by other clownfish. This aggression from other A. ocellaris in the anemone can cause the juvenile to be chased out of the anemone, and left to search for another anemone[4][5][13][14]

Group size and patch size

Studies have shown that there is a correlation between the size of the group and the size of the patch; however this correlation provides no implication that subordinate group members have less resources. More likely, it is the effects of the patch size on the group member that dominates interactions. An experiment was performed to study the mechanism responsible for the positive correlation between the group size and patch size. The scientists argued that the correlation between the group size and patch size is because of the indirect consequence of the positive relationship between the dominant group member's length and the anemone size. The length of the dominant group member limits the group size because the length of the dominant group member prevents the group of the subordinate group members. This data shows that the patch size and group size correlation does not necessarily imply the decrease in resources of group members subordinate to the dominant group member.[15]

Food habits

A. ocellaris feed on plankton and algae, thus they are considered omnivores. Feeding is also affected by the hierarchy in A. ocellaris groups. Since the smaller, less dominant fish face aggression from the more aggressive fish, they have less energy to forage for food. Thus, they usually do not eat as much as the dominant fish do, because of reduced energy, but also because of the increased danger they face when they leave their anemone since they are smaller. In other words, the larger fish will usually travel farther than the smaller fish. Generally, the A. ocellaris feed on algae, copepods, and zooplankton.[4][14][16]

Reproduction and life history

A. ocellaris have reproductive behaviors very similar to that of all anemonefish. They have monogamous mating systems, and in their spawning processes, they also have different levels of aggressiveness between males and females. In addition, there is a reproductive hierarchy that exists between age and sex.

Clownfish are initially male; the largest fish in a group becomes female.

Spawning

There is not much data on the reproduction of A. ocellaris. However, similar behaviors throughout all anemone fishes have been recorded. These fish have monogamous mating systems, and are territorial of their anemone. Males become more aggressive during spawning. Male behavior also changes to attract females: biting, chasing, fin extension. Before spawning, the male prepares the nest near the anemone (so that the tentacles of the anemone can protect the nest). After the male chases the female to the nest, the female begins the spawning process. She lays eggs for about one to two hours, and then leave the nest for the male to fertilize the eggs. The eggs take approximately six to eight days to hatch (this time period can be affected by the temperature of water). Because of the external fertilization, males usually care for the eggs. They also have responsibilities for eating fungi-infected or infertile eggs, and fanning the eggs.[4][14]

Reproductive hierarchy
The males can change sex to female during their lives, and live in a harem in which an established dominance hierarchy manages the group and keeps individuals at a specific social rank.

All anemonefish are protandrous hermaphrodites, meaning they first develop into males and may become females later in life. Anemonefish exhibit phenotypic plasticity when males, females, and juveniles inhabit the same anemone. In an anemonefish social group, the female is the dominant and largest member, followed by the dominant male, while other anemonefish remain non-reproductive.[17]

One experiment placed three juvenile anemonefish in a tank and observed their behaviors over the course of a month. The researchers drew conclusions about the fish's social hierarchy based on signs of dominance such as aggressive or appeasing behaviors, occupation of territory in the tank, and body mass increase. The dominant fish grew larger compared to lower-ranked fish, suggesting the lower-ranked fish experienced growth suppression. In addition, a difference in the fish's levels of certain steroids suggested that lower-ranked individuals also experienced reproductive suppression.[18]

Another experiment demonstrated that when a female anemonefish is removed from the anemone, then the dominant male becomes the female and the next-highest-ranked male moves up the dominance hierarchy to become the dominant male. Females use aggressive dominance behavior to control the males, preventing the formation of other females, and dominant males prevent juvenile males from mating.[17]

In aquaria

In nature, the false percula clownfish is hosted by Heteractis magnifica and Stichodactyla gigantea. However, in captivity in a reef aquarium, the false percula is hosted by other species of anemone, including Entacmaea quadricolor. In addition, clownfish may adopt a surrogate host as opposed to an anemone, such as Euphyllia divisa, xenia coral, etc.

Human interaction

A. ocellaris are utilized as part of the tropical fish aquarium trade. However, only certain colors are in demand. In addition, A. ocellaris are used in research since they can be bred easily.[19] This high demand in trade has been dangerous for A. ocellaris' population due to overexploitation.

The protagonists Marlin and his son Nemo from the animated film Finding Nemo, and its sequel Finding Dory, are Ocellaris clownfish.

See also
  •  fish portal

References
  1. Bailly, N. (2010). Bailly N (ed.). "Amphiprion ocellaris Cuvier, 1830". FishBase. World Register of Marine Species. Retrieved 2011-12-19.
  2. Allen, G. 1997. Marine Fishes of Tropical Australia and South-East Asia. Perth: Western Australian Museum.
  3. "Amphiprion ocellaris". Encyclopedia of Life. Retrieved 12 September 2016.
  4. Fautin, Daphne G.; Allen, Gerald R. (1997). Field Guide to Anemone Fishes and Their Host Sea Anemones. Western Australian Museum. ISBN 9780730983651. Archived from the original on 10 January 2015.
  5. Myers, R. 1999. Miconesian Reef Fish: A Field Guide for Divers and Aquarists. Barrigada: Territory of Guam: Coral Graphics.
  6. Allen, Marine Fishes of Tropical Australia and South-East Asia,Western Australian Museum,1997,ISBN 9780730987512
  7. Froese, Rainer and Pauly, Daniel, eds. (2014). "Amphiprion ocellaris" in FishBase. November 2014 version.
  8. Vilcinskas, Andreas (2002). La vie sous-marine des tropiques [Marine life of the tropics] (in French). Paris: Vigot. ISBN 2-7114-1525-2.
  9. Dianne J. Bray, 2011, Western Clown Anemonefish, Amphiprion ocellaris, in Fishes of Australia, accessed 25 Aug 2014, http://www.fishesofaustralia.net.au/Home/species/1275
  10. Newcomb, Dani. "Amphiprion ocellaris (Clown anemonefish)". Animal Diversity Web.
  11. "social system." WordNet 3.0, Farlex clipart collection. 2003-2008. Princeton University, Clipart.com, Farlex Inc. 6 Dec. 2013 http://www.thefreedictionary.com/social+system
  12. Mitchell, Jeremy. "Queue Selection and Switching by False Clown Anemonefish, Amphiprion Ocellaris." Animal Behavior 69 (2005): 643-52. Science Direct. Web.
  13. Arvedlund, M., L. Nielsen. 1996. Do the anemonefish Amphiprion ocellaris (Pisces: Pomacentridae) imprint themselves to their host sea anemone Heteractis magnifica (Athozoa: Actinidae)?. Ethology, 102: 197-211.
  14. Thresher, R. 1984. Reproduction in Reef Fishes. New Jersey: T.F.H. Publications, Inc..
  15. J.S. Mitchell1,2 and L.M. Dill. Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
  16. Sano, M., M. Shimizu, Y. Nose. 1984. Food habits of teleostean reef fishes in Okinawa Island, Southern Japan. Japan: University of Tokyo Press.
  17. Fricke, H., S. Fricke. 1977. Monogamy and sex change by aggressive dominance in coral reef fish. Nature, 266: 830-832.
  18. Iwata, Eri, Yukiko Nagai, Mai Hyoudou, and Hideaki Sasaki. "Social Environment and Sex Differentiation in the False Clown Anemonefish, Amphiprion ocellaris." Zoological Science 25.2 (2008): 123-28. Print.
  19. Sadovy, Y., A. Vincent (2002). "Ecological Issue and the Trade in Live Reef Fishes". pp. 395 in P Sale, ed. Coral Reef Fishes. San Diego, California: Academic Press.
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