At least that's what we thought was going on. But one day, while watching this nostalgic display in the , Stanford postdoctoral biology researcher Karen Maruska noticed something unusual. A dominant male was courting a female in one corner of the tank, at the entrance to a terra cotta pot he had claimed as his territory.
Xenotilapia flavipinnis. Photo by Dave Hansen
As in other teleosts, approximately 16–19% of the four East African cichlid genomes consist of transposable elements (TEs), and over 60% of cichlid TEs are DNA transposons (; ). Three waves of TE insertions were detected in each of the cichlid genomes (), including a cichlid-specific burst of the Tigger family. Notably, this TE family has continued expanding in the youngest radiation, Lake Victoria ().
African Cichlid Fry Growing in Time Lapse Video
Differences in the expression patterns of duplicate genes may contribute to evolutionary divergence of species. The expression patterns of 888 duplicate gene pairs from the common ancestor of the East Africa cichlids were categorized according to whether they are expressed widely among tissues (52.8%), are similarly restricted in their expression patterns for both gene copies (26.6%), or, in at least one gene copy, have newly gained expression in one or more tissues (20.6%). 7.5% of duplicates lost or gained complete tissue specificity, many (43%) of which have gained specific expression in the testis. In each of the stomatin and gene pairs, one gene copy is broadly expressed whereas expression of the other is restricted to the testis (). is the zebrafish orthologue of the human , a transcription factor suggested to have a role during spermatogenesis. This observation is particularly interesting in the context of strong sexual selection observed in many East African cichlids, , including our sequenced species with the exception of .
Tropheops sp. “Aurora”. Photo by Ad Konings
The Blue Peacock Cichlid does well in an aquarium that is at least 55 gallons with plenty of rocks for territories and a sandy bottom. The males are usually only aggressive towards their own species unless their territory is invaded upon. Provide a ratio of 3 to 4 females to one male.The Blue Peacock should be fed a variety of both meaty and vegetable-based foods. Feed live and frozen brine shrimp along with Spirulina-based flake and pellet foods.The male Blue Peacock's colors will become more vivid during breeding time. The yellow will become more pronounced and his temperament will become more aggressive. Again, provide multiple females for the male, as it will take the stress off of the female carrying the eggs. Incubation is approximately three weeks, at which time, the female will release the fry. Provide the fry with newly hatched brine shrimp and finely ground flake food.The number of cichlid species identified in the wild is well over 1,000 and biologists think that many more are waiting to be discovered. Cichlids are found in many locations throughout the world and include such favorites as the freshwater angelfish, the tiger oscar fish and the jack dempsey cichlid.