title: Effect of ploidy on scale-cover pattern in linear ornamental (koi) common carp Cyprinus carpio.
abstract: The effect of ploidy on scale-cover pattern in linear ornamental (koi) common carp Cyprinus carpio was investigated. To obtain diploid and triploid linear fish, eggs taken from a leather C. carpio female (genotype ssNn) and sperm taken from a scaled C. carpio male (genotype SSnn) were used for the production of control (no shock) and heat-shocked progeny. In heat-shocked progeny, the 2 min heat shock (40° C) was applied 6 min after insemination. Diploid linear fish (genotype SsNn) demonstrated a scale-cover pattern typical for this category with one even row of scales along lateral line and few scales located near operculum and at bases of fins. The majority (97%) of triploid linear fish (genotype SssNnn) exhibited non-typical scale patterns which were characterized by the appearance of additional scales on the body. The extent of additional scales in triploid linear fish was variable; some fish had large scales, which covered almost the entire body. Apparently, the observed difference in scale-cover pattern between triploid and diploid linear fish was caused by different phenotypic expression of gene N/n. Due to incomplete dominance of allele N, triploids Nnn demonstrate less profound reduction of scale cover compared with diploids Nn.
authors.affiliation: Aquaculture Research Center, Kentucky State University, Frankfort, KY 40601, USA. boris.gomelsky@kysu.edu
authors.forename: B
authors.initials: B
authors.lastname: Gomelsky
authors.forename: K J
authors.initials: KJ
authors.lastname: Schneider
authors.forename: R P
authors.initials: RP
authors.lastname: Glennon
authors.forename: D A
authors.initials: DA
authors.lastname: Plouffe
mesh_terms: D000818:Animals; D001947:Breeding; D002347:Carps / Q000033:anatomy & histology* / Q000235:genetics*; D004171:Diploidy; D005260:Female; D008297:Male; D010641:Phenotype; D057885:Triploidy