Fish, Tanks and Ponds


Fish, Tanks and Ponds
A comprehensive guide to fish

Malawi Mbuna

Maylandia zebra 'Gallireya Reef'
Maylandia zebra 'Gallireya Reef'

Introduction

The first thing to consider is what type of fish do you want to keep. Lake Malawi is so big that it offers many types of habitat and each niche is filled with its own type of fish. The most popular of these are the Mbuna because of their bright colours

The Lake.

Lake Malawi is the third largest lake in Africa and the ninth largest in the world. It used to be called Lake Nyassa and it is surrounded by 3 countries Tanzania, Mozambique and Malawi.
It is almost 375 miles long and has a maximum width of 50 miles and it has a depth of 700m in places but the average depth is 292m.
The average pH is 7.8 to 8.6, surprisingly the GH is 4 to 6 and the KH is 6 to 8 making the water very soft. The temperature at the surface varies from 23 to 28 C.

Because of the size and the huge volume of water involved, the Lake is very stable and the fish that live there have become accustomed to this and generally they need to be kept in a stable environment if they are to thrive.
The Lake has over 600 known species of Cichlid many of them endemic to Lake Malawi which means they are found no where else.
There are many habitats from boulder strewn shores to open sandy areas, Valisinaria beds to deep open water. The fish known locally as Mbuna (rock dweller) are extremely colourful fish and are highly prized by aquarist.

Tank.

The tank should be the biggest possible. This is because it will be easier to maintain stable conditions and it will give the fish enough room to escape a bully.
The smallest size you should consider is a 48 x 15 x 15 and in such a tank you would have to limit your choice of fish to the comparatively more gentle and less aggressive species.

Filtration.

A good powerful external power filter is the best option set-up for mainly biological and mechanical filtration. Under gravel filters are not much use because these fish constantly dig and would short circuit the filter.
These fish demand clean high quality water conditions Ammonia and Nitrite should both be 0, and Nitrate must be kept below 20 ppm. This will mean routine water changes are essential. With Mbuna there is a lot less aggression when the fish are kept slightly crowded which in turn means that any filter should be big enough to cope with the higher than usual demand.

Substrate and Decor.

The substrate should not be to deep or it will trap dirt and adversely affect the water quality 1/2" is plenty and it should include some coral sand which will act as a buffer and help to maintain the correct pH. Other open water species prefer sand which they will sift through looking for food.
Mbuna must have LOTS of rockwork in their aquarium but open water species don't need any rockwork. If you use rocks in the tank make certain they are stacked safely. Use aquarium grade epoxy resin to bond the rocks together and put the rocks in place before adding the substrate so that the fish can't under mine them.
All types of rocks can be used including calcareous rocks these will in fact be useful since they will help buffer the water and keep it stable.

Water Chemistry.

These fish have evolved in a very specialised way to be fully at home in a certain set of conditions over tens of thousands of years. Whilst some of the captive bred fish have become more tolerant of a wider set of conditions they are still at their best when kept in the conditions they have evolved to best cope with.

  • pH 7.5 to 8.4.
  • GH 4 to 6
  • KH 6 to 8
  • Ammonia/Nitrite 0
  • Nitrate < 20ppm.

Feeding.

All Mbuna will do very well on a herbivore diet with the occasional live or frozen food added. In the wild they graze on Algae and any small creatures that live in amongst it. This has become widely known as aufwuch. In order to replicate this they need a light high fibre diet.
Suitable food includes Spiralina flake, Vegetarian lake, Daphnia, Algae, thinly sliced Cucumber, Lettuce, Cyclops, Daphnia and Bloodworms.
They should be fed little and often 2 or 3 times per day

Note

It is important not to rely to heavily on dried food because this has been linked to a condition known as Malawi Bloat, and as the name suggest it causes the fishes bodies to swell and can result in death.
Also these are greedy competitive fish with a strong tendency to over eat which results in obesity. Fish that become obese will have shorter lives as a result.

Aquarium stocking.

When selecting the fish for your tank there are some general rules which will help keep things go smoothly. Keep only one adult male of each species with two or more females. Don't keep very similar or closely related species together. And the stocking level is absolutely critical, if there are to few fish there is a very real chance of one of the larger males becoming hyper-dominant and attacking all the other fish to the point of actually killing them. To many fish and it will lead to stress from over crowding which in turn will lead to ill health. In between these two scenarios is the ideal where there are two many other males for a single fish to risk trying to become dominant but there is still enough space to allow them to feel settled and this is what to aim for. Generally if you allow one inch of fish for every eight sq inches of water surface you will be in the right area for the stocking level. But that is only a guideline it will depend on the individual set-up and fish concerned even the personalities vary from fish to fish so it may be necessary to intervene at some point until you finally reach a peaceful tank. Under no circumstances should you try to keep or breed these fish in a breeding tank using a single male and female, this will nearly always result in the females death.

A rough guide to begin with is one and a half inch of fish per gall.

What are Mbuna

Mbuna is an African word which in English means "Rock Dweller" and it gives a clue about the habitat that these fish live in. All Mbuna come from just one lake and no where else, that lake is called Lake Malawi and it is situated in the E African Rift Valley. Because of its location the lake is rich in mineral salts and this should be a consideration when buying these fish, they will not thrive in soft acidic water. The outstanding feature of all Mbuna is their colours some of them can rival marine fish for colour. They are mouth-brooders which means that they keep the eggs and young fry in their mouth until the fry are big enough to care for themselves. They are also very aggressive but this can be overcome by correct care.

  • Iodotropheus, one of the more peaceful species.
  • Labidochromis, also generally peaceful (for Mbuna).
  • Pseudotropheus, aggression varies from species to species.
  • Metriaclima, an offshoot from Pseudotropheus.
  • Labeotropheus, keep only one male per tank.
  • Melanochromis, very aggressive.

This is only a very limited selection as there are some 600 known species and most of those have a variety of morphs.

Breeding Mbuna

If these fish are kept in good conditions and free from stress they will breed very freely in the community aquarium. Most species are extremely prolific and good healthy colourful young are very much in demand. What is more the fry are very easy to raise. Having said all that I imagine you might be wondering why these fish are listed as being more demanding to breed and not in the easy section. The reason is that they need a specialist set-up in order to keep them and they cannot be kept with other fish due to their special requirements.

Water conditions.

The water in Lake Malawi is hard and alkaline, whilst the hardness isn't critical the alkalinity is.

Ammonia - no trace.
Nitrite - no trace
Nitrate - < 20 ppm (lower the better).
pH - 7.5 to 8.4.
GH - 4 to 6
KH - 6 tp 8

Selecting the parents

The fish will choose their own mates. To ensure good quality fry keep good quality stock. There should be a ratio of one male to two females and for the more aggressive species 0ne male to four or five females. Only one male per species should be kept per tank and even similar looking species are best kept apart. Sometimes hybrids occur, if this happens they must not be passed on or sold. Because such action would eventually ruin the captive bloodlines of these fish to everyone’s detriment.

Preparing.

By maintaining healthy well fed fish is all the preparation that is needed. The males are constantly on the lookout for a female that is ready to breed. The males will hold a small territory and they will display vigorously to any passing female. If the female is ready to breed the pair will circle each other and the eggs will be laid as this happens the female will then collect up all the eggs and hold them in her mouth in order to protect them. During this time she will not eat and she will lose some condition. The brooding females are easy to spot because they tend to be thin and the brood pouch can easily be seen in the region of the fish's chin. The eggs and fry will be protected in this way for about one month.
Once the fish have bred wait for a few days to allow the female to bond with the eggs and then transfer her to another aquarium with the same water chemistry and temp so that she can be on her own. The tank will need a mature sponge filter and some stones with a little cave so that the female will feel secure.
Don't offer any food during this time particularly with inexperienced fish, or the eggs and fry could be put at risk.
When the fry are old enough they will be released and in most cases that is the end of being protected. The mother should now be removed from the tank or there is a risk the fry could be eaten.

Rearing.

This presents no problems, the fry will eat finely powdered flake food and newly hatched Brine shrimp they will also browse on the surface of the sponge filter and on any Algae present. After two weeks you can begin to make small daily water changes and gradually increasing the amount until after five weeks about 20% daily is being changed. These water changes are every bit as important as feeding as far as the fry’s progress is concerned.
After ten to twelve weeks the fry will be ready to sell on at just over one inch.

Popular Mbuna

Cynotilapia afra
Cynotilapia afra

Iodotropheus sprengae
Iodotropheus sprengae

Labeotropheus fuelleborni
Labeotropheus fuelleborni

Labidochromis caeruleus
Labidochromis caeruleus

Maylandia hojomaylandi
Maylandia hojomaylandi

Maylandia sp. "zebra gold" Kawanga
Maylandia sp.
 "zebra gold" Kawanga

Maylandia Zebra 'Red Top'
Maylandia Zebra
 'Red Top'
Mpanga

Melanochromis auratus
Melanochromis auratus

Melanochromis johanni
Melanochromis johanni

Pseudotropheus crabro
Pseudotropheus crabro

Pseudotropheus elongatus
Pseudotropheus elongatus
'Ornatus'

Pseudotropheus lombardoi
Pseudotropheus lombardoi

Pseudotropheus tropheops
Pseudotropheus tropheops
"Red Cheek Chizamulu"

Tropheops.sp 'Yellow'
Tropheops.sp
'Yellow' Chitumba