Cyphotilapia gibberosa TAKAHASHI & NAKAYA, 2003

Etymology

Cyphotilapia: from the Ancient Greek κυφός (kyfós), meaning ‘a hump’, and the generic name Tilapia, itself a latinisation of the Tswana word tlhapi, meaning ‘fish’.

gibberosa: derived from the Latin gibber, meaning ‘a hump’, in allusion to the hump on the head of adults.

Classification

Order: Perciformes Family: Cichlidae

Distribution

Endemic to the southern portion of Lake Tanganyika where it is distributed between Kilewa Bay on the western coast and the Mahale Mountain National Park on the eastern coast.

It occurs throughout this area, but localities popular in the aquarium hobby include: Kapampa, Kitumba, Mikula, and Moba in Democratic Republic of the Congo (formerly known as Zaire, which is still used in reference to some populations; see ‘Notes’); Bismark, Chaitika, Nangu, and Samazi in Zambia; Mpimbwe, Ikola, Kantalamba, and Mabilili in Tanzania.

Type locality is ‘8°43’S, 31°08’E, Kasenga, Zambia, Lake Tanganyika, depth 34 meters’.

Habitat

Tanganyika is the most ancient of East Africa’s Great Rift Lakes. It is estimated to be the second largest, second deepest, and longest freshwater body in the world, and contains a diverse array of endemic taxa including an ecologically complex assemblage of approximately 250 cichlid species.

C. gibberosa is most commonly observed in littoral, sediment-rich, rocky environments at depths of 6-120 metres, typically among boulders with patches of open substrate between 15-70 metres. Such habitats contain relatively few available shelters, and this appears to have exerted a direct influence on the species’ reproductive strategy (see ‘Reproduction’).

It forms large aggregations which sometimes contain 1000 individuals or more, with older, larger individuals displaying a preference for deeper water.

Maximum Standard Length

220- 255 mm.

Aquarium SizeTop ↑

Dimensions of 240 ∗ 60 ∗ 60 cm or equivalent are the minimum necessary for long-term maintenance, but greater width, and particularly depth are highly recommended.

Maintenance

A well-structured aquarium comprising some sheltered areas with plenty of open space is considered ideal. A natural set-up could consist of a sandy substrate plus some piles of water-worn rocks of various sizes, some of which can be arranged to form cave-like structures, and perhaps a few large boulders.

Alternatively, aquarium gravel can be used as a substrate, and items such as earthenware flower pots utilised as refuges, but in all cases sharp edges should be avoided in order to prevent the fish injuring themselves.

The alpha male(s) tend to select a particular cave or other sheltered area, thus it is beneficial to provide enough structures of sufficient size to accommodate the largest males present. If some smaller caves are provided, females will make use of them when holding eggs (see ‘Reproduction’).

Water quality is of the utmost importance since these cichlids are extremely susceptible to deteriorating water quality, and should never be introduced to a biologically immature aquarium. Cyphotilapia spp. also require hard, alkaline conditions and in most cases will not thrive in untreated tap water.

The best way to achieve the desired stability is to filter the tank using a combination of external canister filters and/or a sump system and perform minimum weekly water changes of 30-50%. High flow rates should be avoided so position filter returns accordingly.

Lighting is essentially a matter of personal choice, although the fish themselves display a preference for somewhat murky conditions, in keeping with their natural habitat.

Water Conditions

Temperature: 23 – 27 °C

pH: 8.0 – 9.0

Hardness: 179 – 447 ppm

Diet

This species is a generalised predator feeding on smaller fishes, macro-invertebrates, and molluscs, plus some algae and organic detritus which is presumably ingested when the fish are browsing the substrate or the surface of rocks.

In the aquarium it will accept high quality prepared foods plus live or frozen Artemia, mosquito larvae, shrimp, etc. At least some of the dried products should contain a significant proportion of vegetable matter, such as Spirulina or similar, while chopped peas and suchlike are also useful supplements.

It should not be offered mammalian or avian meat such as beef heart or chicken since some of the lipids contained in these cannot be properly metabolised by the fish and may cause excess fat deposits and even organ degeneration. Similarly there is no benefit in the use of ‘feeder’ fish such as livebearers or small goldfish which carry with them the risk of parasite or disease introduction, and tend not have a high nutritional value unless properly conditioned beforehand.

Behaviour and CompatibilityTop ↑

This species may eat much smaller fishes but can form part of a well-chosen Tanganyikan community provided the aquarium is of a sufficient size.

It is gregarious and should be maintained in a group of at least five, ideally ten or more, specimens. Unlike many cichlids, males do not hold distinct territories, but form a distinct dominance hierarchy within which one or more alpha individuals develop depending on the size of the group and amount of available space

Sexual Dimorphism

Juveniles are impossible to sex accurately but adult males grow larger, possess more extended fins, and develop a larger nuchal hump than females.

Reproduction

A maternal, ovophilous mouthbrooder that is commonly bred in aquaria.

Adult males are polygynous and should ideally be offered at least 3-4 females each, and it should be noted that sexual maturity is attained after several years so patience may be required if starting with young fish.

Little to no water movement is ideal and some aquarists recommend the use of undergravel filtration if using a separate aquarium for breeding purposes, while low lighting is also considered strongly beneficial.

The eggs are very large and brood size correspondingly small, normally 10-50 depending on the size of the female. Once fertilised they are immediately collected by the female, and remain in her mouth for a particularly long period of 35-50+ days.

Once the eggs have hatched, brooding females exhibit a behaviour known as buccal feeding, in which smaller items of food are taken and partially or entirely ingested by the fry  in the buccal cavity. Buccal feeding begins while the fry are in an early developmental stage with large yolk sacs, and continues throughout the remainder of the mouthbrooding period. Regular meals of Artemia nauplii and suchlike can thus be offered to brooding female individuals and should benefit fry development since the fry are not released at all until they are able to survive independently. This appears to be an adaptation to the species’ natural habitat which contains relatively few refuges.

Some breeders prefer to manually remove the eggs or fry from the mouth of the female and hatch them elsewhere, often using an air-powered device known as an egg tumbler. This process is known as ‘stripping’ and is not recommended for beginners.

NotesTop ↑

Cyphotilapia species are typically referred to as ‘frontosa’ or simply ‘front’ in the aquarium hobby, although other vernacular names include ‘Tanganyika humphead’.

Populations of C. gibberosa from different localities are often labelled as such in order to maintain accuracy and preserve pure bloodlines. Forms referred to as ‘Blue Zaire’ are sometimes misidentified as C. frontosa but all refer to C. gibberosa.

Prior to the description of C. gibberosa in 2003 the genus Cyphotilapia was considered monotypic for almost a century. Members are separated from other cichlid taxa inhabiting Lake Tanganyika by possession of a hump on the forehead and broad vertical bands on the body, although the latter tend not to be visible in large males.

C. gibberosa can be separated from its only congener C. frontosa by the following characters: presence of three scale rows between the upper and lower lateral lines (vs. two in C. frontosa); 34-36 (mean 34.9, standard deviation ±0.8) scales in the longitudinal series (vs. 33-35, 34.1, ±0.6); 31-52 (42.7, ±4.7) outer teeth in the upper jaw (vs. 39-62, 48.8, ±5.4); deeper body (43.3-51.2 vs. 38.2-46.5 % SL); greater predorsal length ( 37.5–44.9 vs. 37.1-42.7 % SL); greater dorsal-fin base (57.1-64.6 vs. 53.8-60.9 % SL); greater pectoral-fin length (36.0–47.2 vs. 31.3-41.7 % SL).

References

1. Takahashi, T. and K. Nakaya, 2003 - Copeia 2003(4): 824-832
   New species of Cyphotilapia (Perciformes: Cichlidae) from Lake Tanganyika, Africa.
2. Konings, A., 2005 - Hollywood Import & Export Inc.: 1-192
   Back to Nature: Guide to Tanganyika Cichlids, Revised & Expanded Second Edition.
3. Takahashi, T., B. Ngatunga, and J. Snoeks, 2007 - Ichthyological Research 54(1): 55-60
   Taxonomic status of the six-band morph of Cyphotilapia frontosa (Perciformes: Cichlidae) from Lake Tanganyika, Africa.
4. Yanagisawa, Y. and H. Ochi, 1991 - Environmental Biology of Fishes 30(3): 353-358
   Food intake by mouthbrooding females of Cyphotilapia frontosa (Cichlidae) to feed both themselves and their young.