Breeding Tubercles in Fishes

International Congress On Engineering And Life Science (ICELIS), Kastamonu, Türkiye, 26 - 29 Nisan 2018, cilt.000, sa.0, ss.364

Seconder sex characteristics are phenotypic specifications in living organisms morphologically

distinguishable and available for sex discrimination. Breeding tubercles that white nodules because of epidermic

cells differentiation head, dorsal and caudal sections and fins are one of these properties. Breeding tubercles have

considered to consist of some reasons such as communicating with females or stimulating reproduction, and

territoriality throughout the breeding period. Especially tubercles occur in male fishes at breeding period are

triggered off pituitary and sex hormones and then disappeared. These tubercles are formed in lots of fish species

in breeding period were reported and these fishes have got tubercles consist of 4 orders and 15 families:

Salmoniformes, Gonorynchiformes, Cypriniformes ve Perciformes. Breeding tubercles are also observed in

males of Cyprinus carpio live in the Van Lake Basin and males of Alburnus tarichi ve Capoeta kosswigi are

endemic for the Van Lake Basin in breeding session. Breeding tubercles firstly are formed on head of the fishes

in middle of May afterwards on dorsal and caudal sections with ventral, pectoral and anal fins in June. However,

small amount of tubercles were observed in August. At the different water resources in the Van Lake Basin,

there are some differences in the way of forming times according to water temparature for the same species. In

this study, structures, shapes, occuring on fish sections of tubercles and fish species with tubercles were focused.