Hybrid fish such as flowerhorn cichlids and blood parrot cichlids are controversial. Examples of ovuliparous fish include salmon, goldfish, cichlids, tuna and eels. Examples of oviparous fish include salmon, goldfish, cichlids, tuna, and eels. Recreating a Lake Malawi biotope to host cichlids became quite popular in the aquarium hobby. Both of these fishes can be bred with different kinds of cichlids. The ancestor of the Lake Malawi and Lake Victoria cichlids were mouthbrooders. All Tanganyika cichlids are in the subfamily Pseudocrenilabrinae. Ideal tank mates for convict cichlids consists of robust similar sized fish. Many cichlids and some labyrinth fish are ovophile mouthbrooders. Many large cichlids are popular game fish. The oscar is one of the most popular cichlids in the aquarium hobby. This is known to occur in around 19 species of cichlids in Lake Tanganyika. Nile tilapia ("Oreochromis niloticus") and 15 endemic "Haplochromis" cichlids. Many of Tanganyika's cichlids live very specialized lifestyles. Some have called blood parrot cichlids "the Frankenstein monster of the fish world".