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Variable incidences and morphological characteristics of female masu salmon Oncorhynchus masou with growth hormone pseudogene

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The genetic sex of mature masu salmon Oncorhynchus masou (212 males and 243 females) collected from three rivers located in the mid‐western part of Hokkaido was determined using the male‐specific genetic marker growth hormone pseudogene (GHp). A total of 72 phenotypic females were found to have GHp, whereas none of the phenotypic males lacked GHp. The occurrence of females with incongruence between genotypic and phenotypic sex varied with the river and reached the highest rate of 67%. In contrast, none of the phenotypic males were found to have a female genotype. Comparison of adult body size showed that females with GHp were significantly smaller than those without GHp. Moreover, comparison of secondary characteristics revealed that both upper jaw length and head length were greater in females with GHp than in those without GHp. These results suggest that genetic changes (e.g. transposition and mutation) may also affect morphological characteristics.
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Document Type: Regular Paper

Publication date: 01 February 2012

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