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Fish o’ the day | Eritrean Butterflyfish
The Eritrean Butterflyfish or Crown Butterflyfish, Chaetodon paucifasciatus, is a species of butterflyfish (family Chaetodontidae). It is essentially just known from the Red Sea and the Gulf of Aden, but has been reported from East Africa.
It grows up to 14 cm (5.5 in) in length. It is white with black chevrons, except for a red zone stretching from the aft dorsal fin across the caudal peduncle to the end of the anal fin. A red bar runs vertically through the caudal fin. There are black eyestripes and a black “crown” with white border.
Eritrean Butterflyfish are oviparous fish forming monogamous pairings during breeding. They are usually found in pairs or in small groups over coral and rubble areas from 1m to 30m depth. They feed on coral polyps, gorgonians, algae, polychaete worms and small crustaceans.
This fish fares well in the aquarium and thus is sought after by hobbyists.
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Text is available under the terms of the GNU Free Documentation License.
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Fish o’ the day | Lawnmower Blenny
Affectionately known as the Lawnmower Blenny, Salarias Fasciatus is a popular marine aquarium fish species in Australasia. Named for its propensity to consume algae growth from rocks and glass, the Lawnmower Blenny is generally regarded as compatible with most other marine fish species and as a group with other lawnmower Blennies.
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Text is available under the terms of the GNU Free Documentation License.
Fish o’ the day | French Angel
The French angelfish, Pomacanthus paru, is a large angelfish of the family Pomacanthidae, found in the western Atlantic from Florida and the Bahamas to Brazil, and also the Gulf of Mexico and the Caribbean, including the Antilles, and the eastern Atlantic from around Ascension Island and St. Paul’s Rocks, at depths of between 2 and 100 m. Length is up to 41 cm.
The French angelfish is common in shallow reefs, usually in pairs, often near sea fans. It feeds on sponges, algae, bryozoans, zoantharians, gorgonians and tunicates. Juveniles tend cleaning stations where they service a broad range of clients, including jacks, snappers, morays, grunts, surgeonfishes, and wrasses. At the station the cleaner displays a fluttering swimming and when cleaning it touches the clients with its pelvic fins. Coloration in adults is black, the scales of the body, except those at the front from nape to abdomen, being rimmed with golden yellow; a broad orange-yellow bar at pectoral absent; dorsal filament yellow; chin whitish; outer part of iris yellow; eye narrowly rimmed below with blue. Juveniles are black with vertical yellow bands.
Reproduction is oviparous and these species are monogamous. Spawning pairs are strongly territorial, with usually both members vigorously defending their areas against neighboring pairs. Its flesh is considered good quality and it is marketed fresh. It has been reared in captivity.
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Text is available under the terms of the GNU Free Documentation License.
Fish o’ the day | Passer Angel
The Passer Angelfish, Holacanthus passer, is a large marine angelfish of the family Pomacanthidae, sometimes referred to as the King Angelfish. Due to its large size and bright colors it is a popular aquarium fish, despite the fact that it can be difficult to keep.
Distribution
The Passer Angelfish is a non-migratory tropical fish that inhabits reefs in the eastern Pacific ocean from the coast of Peru north to the California gulf, including offshore islands as far west as the Galapagos, generally at a depth of between 4-30 meters.
Physical description
Passer Angelfish are sexually isomorphic, meaning males and females are visually identical on the outside. They do, however undergo significant changes in coloration and to a lesser degree shape as they mature. Juvenile Passer Angelfish are primarily yellow, with iridescent-blue-rimmed fins and blue striping towards the posterior of their bodies, and an orange mask around the eye. Sexually mature Passer Angelfish, on the other hand, have mostly brown or blue bodies (depending on the light) with the same blue rimming around the fins and a yellow dorsal fin. Passer Angelfish generally grow to 35 or 35 cm long. They have between 18 to 20 rays in their dorsal fin and each of their pectoral fins, and 17 to 19 in their anal fin. There is also have a strong spike found under their lower cheek for defensive purposes.
Habitat and diet
Passer Angelfish primarily inhabit the middle and bottom of the water column of rocky tropical reefs, including in the larger crevices between rocks, and juveniles can occasionally be found in tide pools. They are diurnal and feed on sponges, other sessile invertebrates, zooplankton, and certain species of benthic microalgae.
In Aquaria
Passer Angelfish are somewhat popular as aquarium fish, however their large size, specialized diet, and prohibitive cost make them comparatively poor captive pets. They have not bred in captivity and hence can be very difficult to find in most hobby shops, although they are slightly more available through mail order companies, for a price. Passer Angelfish also have a well-deserved reputation for being difficult to keep, largely because they require sponges and tunicates as a food source and will often not accept even prepared foods with such things as ingredients. Besides their diet, they are not particularly picky about salinity or pH, so long as they are kept stable and the water quality high. Angelfish in general are not generally good community inhabitants, Passer Angels being no exception. If introduced when young, a lucky aquarist may be able to keep two angels in one appropriately size aquarium, but such experiences tend to be the exception, not the norm. Passer Angelfish are quite dominant and can be abusive to smaller or more docile tankmates, or Angelfish that are lower on the social hierarchy for whatever reason.
Reproduction
Passer Angelfish are monogamous within their pairs and, during their spawning cycle, will mate daily around sunset. During a spawning cycle a pair can produce upwards of ten million fertilized eggs, averaging about 25-75,000 daily. These eggs then drift in the water column for about 20 hours, at which point they hatch. After hatching, the fin-less fry live off their yolk sack until it is completely absorbed, at which point they begin to eat small zooplankton.
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Text is available under the terms of the GNU Free Documentation License.
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