Red-Top Trematocranus, Trem (Otopharynx lithobates) — 6-7cm

Overview

The Otopharynx lithobates, known among enthusiasts as the Red-Top Trematocranus or simply Trematoc, is a striking Lake Malawi cichlid reaching an impressive 16 cm and requiring a substantial minimum 300-litre aquarium. With semi-aggressive temperament and delivering bold coloration when properly maintained, this maternal mouthbrooder suits experienced Malawi cichlid keepers ready to manage territorial behavior in spacious African cichlid setups. Endemic to Lake Malawi where it establishes territories in rocky and intermediate zones, this omnivore thrives in hard, alkaline water with robust tankmates. Available for sale UK from Tropical Fish Co, this malawi cichlid brings authentic East African character and impressive size to dedicated Malawi aquariums, rewarding keepers who provide appropriate space and compatible communities with spectacular displays and fascinating breeding behavior.

Appearance

Otopharynx lithobates displays the substantial, robust proportions characteristic of larger Malawi cichlids, with the 16 cm adult size creating commanding aquarium presence. Dominant males develop spectacular coloration including vibrant blues on the body, often with distinctive red or orange coloration on the dorsal region giving rise to the "Red-Top" common name. Females show more subdued grey-brown tones with less dramatic coloration, creating pronounced sexual dichromatism. The species' impressive size combined with striking male coloration creates remarkable visual impact in appropriately large Malawi aquariums. Breeding males intensify coloration dramatically during courtship displays and territorial defense, transforming into some of Lake Malawi's most spectacularly colored cichlids. The robust build and confident bearing reflect the species' semi-aggressive nature and substantial size, creating presence that commands attention in mixed Malawi communities.

Natural Habitat

Endemic to Lake Malawi in East Africa, Otopharynx lithobates inhabits rocky and intermediate zones where it establishes territories and feeds omnivorously on invertebrates, small fish, and aufwuchs. The lake's famous stability—pH 7.6-8.6, very hard water, exceptional clarity, and consistent warmth at 24-28°C—has driven extraordinary cichlid diversity with over 800 endemic species. This species occupies zones between purely rocky mbuna habitat and open sandy areas, exploiting an ecological niche requiring both shelter and foraging grounds. The substantial adult size means it can defend territories against competitors while accessing food resources inaccessible to smaller species. The species' behavioral flexibility and moderate aggression allow coexistence with various Malawi cichlid types in appropriately structured, spacious aquariums replicating the lake's complex habitat mosaic of rocks, sand, and open water.

Aquarium Setup

A substantial minimum 300-litre aquarium is essential for adult Otopharynx lithobates, with even larger volumes (400-500+ litres) strongly preferred for mixed Malawi communities housing this 16 cm species with appropriate tankmates. Create extensive Lake Malawi biotope using rocks arranged to form territories and visual barriers, along with open areas providing swimming space this active species requires. Avoid excessive rockwork that limits swimming room—this species occupies intermediate zones rather than purely rocky mbuna habitat. A sandy substrate mimics natural environment and allows natural foraging behaviors. Avoid plants as they're inconsistent with authentic Malawi biotopes. Install powerful filtration providing 8-10x tank volume turnover per hour minimum to handle the substantial bioload from large cichlids, with moderate water movement. Provide numerous territories to distribute aggression among multiple males if housing mixed-sex groups, essential for managing the semi-aggressive temperament and preventing single individuals from monopolizing aquariums.

Water Parameters

Maintaining very hard, alkaline water replicating Lake Malawi's chemistry is absolutely essential for long-term success. Target pH between 7.6-8.6 using calcium-rich buffering substrates such as coral sand or aragonite, preventing pH drops that stress Malawi cichlids. Water hardness should be very high (12-20 dGH), easily achieved in many UK regions with naturally hard tap water. Temperature should remain stable within 24-28°C. Given the species' substantial 16 cm size and resulting bioload, conduct twice-weekly water changes of 30-40% to control nitrate accumulation below 40 mg/L, with ammonia and nitrite always at 0 ppm. Larger cichlids produce proportionally more waste, requiring more aggressive maintenance schedules than smaller species. Test parameters weekly, maintaining both appropriate absolute values and critical stability—Malawi cichlids evolved in one of the world's most stable aquatic environments and tolerate parameter fluctuations poorly despite hardy reputations.

Feeding

As an omnivore, Otopharynx lithobates requires varied nutrition including both meaty and vegetable components. Offer quality cichlid pellets or flakes formulated for large Malawi cichlids as the staple, with regular additions of frozen or live foods including mysis, krill, brine shrimp, and other protein-rich items providing variety and nutrition. Include some vegetable matter such as spirulina-based foods or blanched greens to ensure complete nutrition and digestive health, though the species accepts more animal protein than strictly herbivorous mbuna. Feed adults once or twice daily in portions consumed within 2-3 minutes, adjusting based on body condition. The species' substantial size and active metabolism mean generous feeding is appropriate, but balance quantity with water quality maintenance through powerful filtration and frequent substantial water changes essential for managing bioload from large omnivorous cichlids with hearty appetites.

Behaviour

Otopharynx lithobates displays semi-aggressive territorial behavior with males establishing and defending territories centered on preferred areas within the aquarium. Aggression levels remain moderate compared to highly belligerent Malawi species, allowing coexistence with appropriately selected tankmates in sufficiently spacious aquariums. Dominant males display their most spectacular coloration while defending territories and courting females, creating remarkable visual displays. The species shows active swimming behavior throughout all water levels, creating visual interest and making it easier to observe than strictly bottom-dwelling species. Males may spar for dominance, though serious conflicts remain uncommon in properly structured aquariums with adequate space and territories. The species' moderate aggression and substantial size mean it can hold its own against various Malawi cichlid types while not dominating peaceful species excessively, making it suitable for mixed Malawi communities with careful tankmate selection.

Tank Mates

Compatible tankmates include other Lake Malawi cichlids of similar size and temperament such as Aulonocara species (peacock cichlids), Placidochromis varieties, other medium to large Malawi haplochromines, and appropriately sized Synodontis catfish as bottom-dwellers. Robust Lake Malawi cichlids with comparable temperament create thriving communities in appropriately spacious aquariums. Completely avoid small community fish that will be intimidated or consumed, very passive cichlids that cannot handle semi-aggressive tankmates, fin-nipping species, overly aggressive large cichlids that may injure or excessively dominate, and any species requiring soft or acidic water—complete incompatibility with Malawi requirements. Best kept with similarly sized peacock cichlids and mild-mannered haps rather than highly aggressive mbuna, creating balanced communities where the species' moderate temperament and striking coloration can be properly appreciated without constant conflict or harassment from more belligerent species.

Breeding

Otopharynx lithobates is a maternal mouthbrooder following typical Malawi haplochromine reproductive patterns. Provide harem-style groups with one male and several females, flat rocks or open spawning areas, and stable alkaline water maintained in excellent condition. Males establish territories and perform elaborate courtship displays to attract receptive females. After spawning, females collect fertilized eggs in their mouths where they incubate for approximately 3-4 weeks without feeding. Females incubate eggs and fry in the mouth, losing body condition during brooding period. Remove fry or raise separately if breeding in community setups, as juveniles face predation from all adult Malawi cichlids. Released fry measure approximately 1 cm and can accept crushed flake foods and newly hatched brine shrimp immediately, growing rapidly with frequent small feedings. The species' substantial adult size means fry grow quickly, reaching saleable size faster than many smaller Malawi cichlids.

Why Buy from Tropical Fish Co

Tropical Fish Co specializes in malawi cichlid species, offering exceptional quality Otopharynx lithobates with comprehensive support for successfully maintaining larger Lake Malawi haplochromines. Our fish arrive fully acclimatized and health-guaranteed, backed by expert guidance about this species' substantial adult size, space requirements, and semi-aggressive temperament. We provide detailed advice on creating appropriately spacious Malawi communities, maintaining proper hard-water chemistry, and stocking strategies that balance visual impact with behavioral compatibility. With decades of combined experience keeping Lake Malawi cichlids from mbuna to large haps, we understand the rewards and challenges of maintaining impressive species like Otopharynx lithobates. Order your Red-Top Trematoc from the UK's premier source for quality african cichlids for sale and experience one of Lake Malawi's most spectacularly colored and impressively sized species in your home aquarium.