This LCR is also conserved in teleost fishes including zebrafish. A polyploidy event occurred within the stem lineage of the teleost fishes. Heat exchange in southern bluefin tuna is a unique adaption among teleost fishes. The goblin shark feeds mainly on teleost fishes such as rattails and dragonfishes. The longnose Sawshark is known to prey on small teleost fish, crustaceans, and small squids. These cells are similar to the mitochondria rich cells found in teleost fish. Previous studies have also investigated sex reversal mechanisms in teleost fish. They are currently classified into two infraclasses, Chondrostei (holosteans) and Neopterygii (teleost fishes). It is only observed in reptiles and teleost fish. The anglerfish is a fish of the teleost order Lophiiformes (). Homologs of interferon-gamma are found in birds, frogs, and teleost fish. In some teleost fish, the lips may be modified to carry sensitive barbels. Environment-dependent sex determination has been documented in at least 70 species of teleost. Electric organs have evolved at least six times in various teleost and elasmobranch fish. Filial cannibalism occurs in some teleost families and may have evolved to combat starvation.