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Angelfish or Pomacanthus
semicirculatus belong to
the family Pomacanthidae. This species is endemic to
and the Rea Sea as far east
as Samoa. Their geographical range
from Japan down the
entire east coast of Africa to Western Australia and New South Wales. These
marine reef fish, occupying depths from 3-100 feet.
One of the common traits
angelfish is the
dramatic transitional color change between the juvenile and adult
their lives. It is simply amazing watching a juvenile’s
into its adult color palette. Koran angelfish fish undergo three
the sojourn to adulthood. The Greek word semicirculatus
refers to the initial phase of their life. Baby Korans have black
bodies with blue
and white striping that expands concentrically forward from the base of
tails. This patterning very much resembles ½ of the ripples
when a pebble is suddenly dropped into it.
A baby Koran could easily be mistaken for a juvenile emperor angelfish.
examination reveals that Koran’s have wider stripes and fewer
these fish reach about 3 inches in length the semicircular markings
into sweeping lines. At roughly five inches in length the fish begins
exhibit patterning between the blue lines on the tail fin that
script, hence the name Koran angelfish. They will exhibit a combination
juvenile and adult coloration. This marks the conclusion of stage two.
approximately two years of age and between 6-7 inches in length this
morphs into its adult color palette. Adults are typically a yellowish
color with varying amounts of blue or browns spotting on their bodies
caudal fin. Their heads may be blue or their primary body coloring.
fins are outlined in blue. This species is marketed by the aquarium
under the following names; Koran Angel, Blue Koran Angel, Half-circle
Half-circled Angel and Semicircle Angel.
These fish will
grow to a
length of 16 inches.
Because of their size they will require a large aquarium. A minimum
of 135 gallons is recommended. A well populated multi-species tank
considerably larger. This fish has a semi-aggressive temperament. It
smaller fish. It will for the most part ignore other larger species. It
however, display major territorial behavior toward
angels. It is
advisable to only keep a single large angle fish of any species in an
Many species of large angles
carry an expert care
level. Korans are rated moderate. Large angels in general have
high mortality rates in captivity. Here are some handy tips to help you
your angle’s survival. Do not choose a baby or an adult
not yet developed a strong enough constitution to endure the transition
life of captivity. They are far more susceptible to improper handling
techniques during capture and transport. Adults have spent their entire
in the wild. It may well prove extremely problematic getting them to
then further modifying their behavior patterns to accept non-living
offerings. Juveniles are generally hardy enough to endure the
process between their native habitat and life in an aquarium. Additionally,
since they have not yet grown
to their full size they are much more likely to fit into a
population. A 4-6 inch juvenile is ideal for a community tank.
Always make sure an
does not show signs of
labored breathing before making a purchase. Angelfish
are susceptible to gill-burn
from improper shipping and poor
water conditions. At normal activity levels the fish’s gill
approximately once per second.
choose a specimen that has a full body and face. Hollowed out features
sure sign of malnutrition. Ask to see the fish feed before making a
fish that is feeding for the pet store is more likely to feed for you.
an active fish with full fins. Sluggish fish and ones with tattered
fins may be
in the early stages of disease. Look for clear and shiny eyes. Also
the fish’s body color is uniform. You do not want a specimen
blotches, blemishes or pitting. Last but definitely not least, put a
the fish you intend to purchase or have the retailer quarantine it for
three weeks before taking it home. If
you own a quarantines tank, an additional isolation period of two weeks
introducing your angelfish to the general population is advisable.
are long lived species. A healthy Koran may live 15-20 years.
are omnivorous. In nature their diet consists of a mixture of sponges,
algae, worms, mollusks and crustaceans. Needless to say this species
make a suitable candidate for a marine reef aquarium.
training them to accepting
food offerings by mixing larger and larger amounts of flake, pellets or
preparations with live brine shrimp. Once
they have been successfully
acclimated, the protein part of their
dietary needs can be supplemented with chopped crustaceans and
should also be fed a variety of algae and plant matter. Chopped
zucchini, yellow squash, and broccoli are suitable veggies. Try
to see which ones they find the most appealing. Algae are an essential
an angelfish’s diet. An abundance of well established live
for properly maintaining theses species. Dried algae sheets will help
nutritional intake. Products such as Ulva (sea lettuce), Nori, Kombu,
Caulerpa can be purchases at most Asian food centers.
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