The Demasoni Cichlid,
Pseudotropheus demasoni, is a relatively
rare cichlid, which originates from a specific rocky point called Pombo
Rocks, within the waters of Lake Malawi located in Tanzania, Africa. The
male of this species has dark blue or black vertical stripes with
alternating lighter stripes of light blue to white. The male Demasoni
Cichlid also displays the typical spots on the anal fin, and is
considerably larger than the female. The female of this species is not
as brilliantly colored, and lacks the spots on the anal fin.
The Demasoni Cichlid is a relatively new addition
to the aquarium hobby, as it was introduced into the hobby trade around
the mid 1990's. Its bright coloration, sharp lines of color contrast
and relatively peaceful demenior made it a very popular species almost
overnight. Demasoni Cichlids are a dwarf species that typically grow to
around 5", which makes them suitable for smaller African Cichlid
aquariums of 55 gallons or more. In its natural habitat, the Demasoni
Cichlid is found in large schools that swim near and amongst rocky areas
that provide them protection from larger species and plenty of plants
and algae on which to graze. In the home aquarium, the Demasoni Cichlid
is an ideal specimen that will aggressively swim about rock formations
in their unique quick elusive manner that makes them a joy to watch.
This is a dwarf Mbuna that only reaches about 2 1/2
to 3 inches (6.4 to 7.6 cm) in length. It is a pretty cichlid that has a
very inquisitive nature with lots of personality and spunk. It is an
interesting fish to watch as it follows the contours of the rocks,
swimming along at odd angles to the point of being upside down. The body
pattern consists of crisp alternating stripes that are dark blue
(almost black) and light blue. On the dorsal fin the stripes angle back
with the lighter ones being thinner than the dark ones. The upper and
lower fins, as well as the tail fin, are edge in a light blue.
The Demanson's Cichlid is sometimes confused with the Pseudotropheus minutus, being similar in size and color. Differences are that on the P. minutus, the lines stop before the tail fin and are less distinct. Also the Demanson's Cichlid males have an egg spot.
This is zebra-type cichlid is a member of a group
called Mbunas. There are 13 genera full of very active and aggressive
personalities of Mbuna cichlids. The name Mbuna comes from the Tonga
people of Malawi and means "rockfish" or "rock-dwelling". This name
aptly describes the environment these fish live in as opposed to being
open water swimmers like the Utaka cichlids and other "haps".
This is a great fish for both the intermediate and
experienced cichlid keeper. Although its a lively little cichlid, it is
moderate to hard to care for and is very aggressive. This is not a
community tank specimen to be housed with fish other than cichlids.
Because of its small size, it can be housed in a bit smaller tank than
what is typical for Mbuna, but of course bigger is better.
No matter what size the aquarium is they should to
be kept in a group of twelve or more to help disperse aggressive
behavior. This helps keeps the dominant male from exhausting females and
others as a result of constant chasing, by spreading the "love" out.
Make sure the aquarium has ample rock formations that provide lots of
hiding places, as this will also help ward off brutal aggression between
them. Piles of rocks can be arranged to create multiple caves and
passageways.
They can also be kept in a large aquarium of mixed
Mbuna species, but again there must be plenty of hiding places. Success
is dependent on the aquarists willingness to do frequent water changes,
have sufficient numbers and hiding places, and provide appropriate tank
mates. The Mbuna's have been bred in captivity and with all the
different hybrids that have been formed, there is no way to tell exactly
what you are getting unless it is from a reputable dealer. Try and keep
the different species blood lines pure.
The Demanson's Cichlid is an
omnivore
that needs mainly herbivorous foods. Their diet should consist of
vegetable matter. An all purpose, high quality cichlid formula can be
used as a basic diet. Including vegetable supplements to their diet will
help with overall
health. This food has fiber which keeps their intestinal tract disease free.
It is always better to feed them small amounts several times a day
instead of one large feeding. This keeps the water quality higher for a
longer period of time. Of course, all fish benefit from added vitamins
and supplements to their foods. It would not be wise to house this fish
with other genus of cichlids that eat beef heart or other mammal meat,
as these foods will cause intestinal infections and death.
Aquarium Setup
The streams that
flow into Lake Malawi have a high mineral content. This along with
evaporation has resulted in alkaline water that is highly mineralized.
Lake Malawi is known for its clarity and stability as far as pH and
other water chemistries. It is easy to see why it is important to watch
tank parameters with all Lake Malawi fish.
Rift lake cichlids need hard alkaline water but are not found in
brackish waters. Salt is sometimes used as a buffering agent to increase
the water's carbonate hardness. This cichlid has some salt tolerance so
can be kept in slightly brackish water conditions. However it not
suited to a full brackish water tank. It can tolerate a salinity that is
about 10% of a normal saltwater tank, a specific gravity of less than
1.0002.
A 40 gallon tank will work for a single fish, but 100 gallons or more
will be needed for a group or a mixed mbuna tank. The Demanson's
Cichlid should always be house in numbers of 12 or more to help
alleviate extreme aggression by the dominant male towards females or
others. They do fine in either freshwater or brackish freshwater but
need good water movement along with very strong and efficient
filtration.
Sand is the preferred substrate, but some aquarists have also used
crushed coral or a mix of gravel and crushed coral. A substrate of
crushed coral or sand used for salt water tanks can help keep the pH up.
They also tend to dissolves easier than salts. Keeping a higher pH
however, means that ammonia is more lethal, so regular water changes are
a must for these fish.
They need caves and rocks to explore as they are very curious little
fish. Having several niches will help them have their own territory,
which is also better for the subdominant females and males. Moving rocks
around every so often may also help with an overly aggressive fish.
- Minimum Tank Size: 40 gal (151 L) - A minimum of 40 gallons for a single fish, with 100 gallons or more for a group.
- Suitable for Nano Tank: No
- Substrate Type: Sand/Gravel Mix
- Lighting Needs: Moderate - normal lighting
- Temperature: 75.0 to 82.0° F (23.9 to 27.8° C)
- Range ph: 7.6-8.6
- Hardness Range: 10 - 18 dGH
- Brackish: Sometimes
- Salt is not found in their natural environment, but they do have a
slight tolerance, keep levels below 10% - a specific gravity of less
than 1.0002.
- Water Movement: Moderate
- Water Region: Middle - These fish will swim in the middle areas of the aquarium.
Social Behaviors
The
Demanson's Cichlid is aggressive and is not considered to be a
community fish. In fact, it should only be housed with other aggressive
Mbunas. Only keep them in a community Mbuna designed tank with lots of
rock structures. They are very territorial, even a 1/2 inch male will
chase away a medium size fish from his territory.
Do not house them with ANY fish that has the same hue or other fish
that have bars, including a yellow with dark bars. Do not house with
similarly colored species, especially species like the
Dogtooth Cichlid Cynotilapia afra or
Kenyi Cichlid Maylandia lombardoi.
You can house them with a yellow Mbuna that does not have bars and they
will be fine. Some examples of appropriate tank mates are a yellow
species of
Electric Yellow Labidochromis caeruleus, the
Red Zebra Maylandia estherae, and the Cobalt Zebra
Maylandia callainos.
This fish is best kept in a group of 12 or more. The male to female
ratio can vary, but there should be more than one male. You may need to
experiment with your fish's temperament to determine how many males you
can keep. In the wild they live in large groups, but the reason for the
large grouping in a captive environment is that this larger number will
prevent the dominant male from focusing his aggression on just a few
fish, thus leading to their death. With a large number, the subdominant
females and males are 'lost in the crowd'. If the numbers are too low,
such as 5 or 6, a male will systematically kill the others until he is
alone. There will be a dominant male in the group, and once he has
established himself, the other Demanson's Cichlids will avoid fighting
with him. If you cannot provide the needed room, it is best to leave
this one at the store.
- Temperament: Aggressive - Should only be housed with other aggressive Mbunas.
- Compatible with:
- Same species - conspecifics: Yes - They are best kept in a group of 12 or more. The male to female ratio can vary, but there should be more than one male.
- Peaceful fish (): Threat
- Semi-Aggressive (): Monitor
- Aggressive (): Safe
- Large Semi-Aggressive (): Threat
- Large Aggressive, Predatory (): Threat
- Slow Swimmers & Eaters (): Threat
- Shrimps, Crabs, Snails: Threat - is aggressive
- Plants: Monitor
Sex: Sexual differences
For
the first couple of months juveniles of both sexes are the same size
and shape. This makes sexing next to impossible unless you vent them. As
they get older, the males will develop elongated ventral fins and an
egg spot.
Breeding / Reproduction
The
Demanson's Cichlid has been bred in captivity. This cichlid is a
mouthbrooder that needs to be in numbers of 12 or more. At one inch a
female will start to brood but the number of fry will be low. Once the
dominant male decides to breed, he will become severely aggressive and
pummel to death any other male in the tank if the tank is too small, or
if there is a lack of hiding places for the other fish. Like other
mbunas the males coloring will change. He will shake and circle the
female, moving her to a flat rock in his territory, then the breeding
begins.
The female will lay between 5 - 15 eggs and then immediately takes
them into her mouth. The male will then flare out his anal fin which has
an 'egg spot' patterning. The female mistakes the patterning for her
own eggs and tries to take them in her mouth as well. This stimulates
the male to discharge sperm (milt cloud) and the female inhales the
cloud of 'milt', thus fertilizing the eggs in her mouth. In seven days,
at about 80° F, the eggs hatch. The fry are free swimming in another two
weeks.
Feed the fry crushed flake, Cyclopeeze and freshly hatched artemia.
Even the fry are aggressive and will pick on each other. Older siblings
don't think twice about eating the newborns if they can fit them in
their mouth. See the description of how cichlids breed in
Breeding Freshwater Fish: Cichlids.
Fish Diseases
Malawi
bloat is a typical disease for the Demanson's Cichlid, especially if
their dietary needs are not met with quality foods. They are susceptible
to typical fish ailments, especially if water is stale and of poor
quality and oxygenation. One common problem is
Ich.
It can be treated with the elevation of the tank temperature to 86° F
(30° C) for 3 days. If that does not cure the Ich, then the fish needs
to be treated with copper (remove any water conditioners). Several
copper based fish medications are available for Ich. Copper use must be
kept within the proper levels, so be sure to follow the manufacturers
suggestions. A copper test also can be used to keep the proper levels.
You can also combine increasing the temperature with an Ich medication
treatment.
As with most fish they are susceptible to skin flukes and other
parasitic infestations (protozoa, worms, etc.), fungal infections, and
bacterial infections. It is recommended to read up on the common tank
diseases. Knowing the signs and catching and treating them early makes a
huge difference
Credits :
http://www.liveaquaria.com/product/prod_display.cfm?c=830+831+1663&pcatid=1663
www.aquaticcommunity.com/fish/demasoni.php
http://www.aquariumdomain.com/viewFreshwaterAfricanCichlid.php?id=39
http://animal-world.com/encyclo/fresh/cichlid/DemansonsCichlid.php
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