Saddleback clownfish

Amphiprion polymnus

''Amphiprion polymnus'', also known as the saddleback clownfish or yellowfin anemonefish, is a black and white species of anemonefish with a distinctive saddle. Like all anemonefishes it forms a symbiotic mutualism with sea anemones and is unaffected by the stinging tentacles of the host anemone.
Saddleback clownfish - Amphiprion polymnus In the anemone Stichodactyla haddoni. Amphiprion polymnus,Fall,Geotagged,Indonesia,Saddleback clownfish

Appearance

''A. polymnus'' is a small sized fish which grows up to 13 centimetre . In any anemonefish group, the female is always larger than the male, but in this species the male is almost equal in size to the female.

Its body has a stock appearance, oval shape, compressed laterally and with a round profile. The body color ranges from dark brown to yellow orange and this species has two or three white bars. The white head bar is thick and located just behind the eyes.

A large white abbreviated saddle shape or slanted white bar across the middle of the fish's body makes it quite obvious to see how it got the name ''Saddleback''. In some varieties, typically those specimens initially associated with ''Heteractis crispa'' anemone, the saddle shape may extend up onto the fish's Dorsal fin with a third white bar or margin located across the caudal peduncle, . The external edge of the caudal and the anal fins are underlined with a white line. The snout and the pectoral fin are in any case of color variation orange yellow to brownish orange.
Saddleback clownfish, Indonesia  Amphiprion polymnus,Geotagged,Indonesia,Saddleback clownfish,Spring

Naming

Historically anemonefish have been identified by morphological features, color pattern in the field, while in a laboratory other features such as scalation of the head, tooth shape and body proportions. These features have been used to group species into complexes and ''A. polymnus'' is part of the saddleback complex with ''A. sebae'' and ''A. latezonatus''. Genetic analysis has shown that ''A. latezonatus'' did not fit within this clade and has a monospecific lineage. The yellow tail of ''A. sebae'' distinguishes that species from ''A. polymnus''.
This are my Eggs! The Saddleback Anemoefish usually has varying amounts of black to dark brown and yellow orange appearance but also has the more orange variation as shown in this pictures. Anemonefishes in general lays their eggs on substrates (rocks and even coconut shells) which the male will 'collect' and brings to next to their Anemone host. The female will then lays her eggs, which will then be fertilised by the 'strongest' male that brings back that 'rock'. They will then, together with the other Anemonefishes in their colony take turns to take care of the eggs by 'airing' the eggs to aerate and clean them by using their mouth and also their pectoral fins. Amphiprion polymnus,Anemonefish,Cebu,Clownfish,Fish,Malapascua,Philippines,Saddleback clownfish

Distribution

''A. polymnus'' is found in the center of the Indo-Pacific area, known as the Coral Triangle, from the Philippines to Indonesia and New Guinea.It is also found in northern Australia, Melanesia and to the Ryukyu Islands of southern Japan. Adults inhabit silty lagoons and harbour areas in depth range from 2 to 30 metres .
Saddleback clownfish (Amphiprion polymnus)-2 Jahir, Lembeh. Is the same group as in the previous spotting but here in the one facing towards the camera I think there may be a parasite in its mouth. Amphiprion polymnus,Geotagged,Indonesia,Saddleback clownfish,Spring

Status

Anemonefish and their host anemones are found on coral reefs and face similar environmental issues. Like corals, anemone's contain intracellular endosymbionts, zooxanthellae, and can suffer from bleaching due to triggers such as increased water temperature or acidification.

The other threat to anemonefish is collection for the marine aquarium trade where anemonefish make up 43% of the global marine ornamental trade, and 25% of the global trade comes from fish bred in captivity, while the majority are captured from the wild, accounting for decreased densities in exploited areas. While bleaching is a significant threat to anemonefish and their host anemones, there is evidence suggesting that collection compounds the localised impact of bleaching. This species was not evaluated in the 2012 release of the IUCN Red List.
Amphiprion polymnus Air Bajo 2, Lembeh.
Fiercely protecting their anemone and brood, as usual. Amphiprion polymnus,Geotagged,Indonesia,Saddleback clownfish,Spring

Behavior

''A. polymnus'' has a diurnal activity, is aggressively territorial and it is dependent on its host sea anemone which it uses as a shelter for the group and for the nest. The anemonefish can also defend the anemone against some reef fishes which could eat the tentacles such as butterflyfishes. Both species of sea anemone, which host ''A. polymnus'', are known to bury themselves in the sand when they are under stress, leaving the fish vulnerable to predation. It has been suggested that the almost equal size of the male is an adaptation to allow it to elude predators by erratic swimming in the water column or covering the relatively long distance to shelter in coral rubble.
Saddleback clownfish (Amphiprion_polymnus) Dauin, Oct 4, 2012.
Like any other clownfishes, they are observed to live with a symbiotic relationship with an anemone, mostly the Saddle carpet anemone or the Sebae anemone, for its protection. It can reach a length of about 4.6 inches at maximum and is considered omnivore since it eats small crustaceans and algae. Its color may vary from yellow orange to dark brown with a thick white bar behind its eyes. Its name originated from the slanted or saddle shaped white bar across the middle section of the body of the fish. In some of this fish’s variety, the saddle shape can extend to the Dorsal fin of the fish with a margin or white bar crossing its caudal peduncle. Studies show that the color of the fish is somehow related to the host anemone.

Widely distributed in the Western Pacific: Ryukyu Islands, Viet Nam, Indonesia, China, Gulf of Thailand, Philippines, Australia, New Guinea, Taiwan, New Britain, and Solomon Islands. It can also be found at the eastern parts of the Indian Ocean. Amphiprion polymnus,Geotagged,Philippines,Saddleback clownfish

Habitat

''A. polymnus'' is found in the center of the Indo-Pacific area, known as the Coral Triangle, from the Philippines to Indonesia and New Guinea.It is also found in northern Australia, Melanesia and to the Ryukyu Islands of southern Japan. Adults inhabit silty lagoons and harbour areas in depth range from 2 to 30 metres .
Looking after the next generation This pair of Saddleback Anemonefish - Amphiprion polymnus is looking after the eggs/embryos which were laid on top of a piece of rock.  They will 'blow' to clean debris/sands from it and at the same time, aerating the eggs/embryo. Amphiprion polymnus,Anilao,Batangas,Clownfish,Fish,Geotagged,Philippines,Saddleback Anemonefish,Saddleback clownfish,Winter

Food

Like all anemonefish, ''A. polymnus'' is omnivorous and its diet is based on zooplankton, small benthic crustaceans and algae.

References:

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Taxonomy
KingdomAnimalia
DivisionChordata
ClassActinopterygii
OrderPerciformes
FamilyPomacentridae
GenusAmphiprion
SpeciesA. polymnus