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Ploidy level, morphological characteristics and performance of interploid hybrids by Megalobrama amblycephala ♀× allo‐tetraploids ♂
Author(s) -
Zou Shuming,
Li Sifa,
Cai Wanqi,
Yang Huaiyu,
Jiang Xiayun
Publication year - 2011
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2010.02765.x
Subject(s) - megalobrama , biology , hybrid , ploidy , snout , hatching , zoology , fishery , botany , fish <actinopterygii> , genetics , gene
Interploid hybrids were produced by mating allo‐tetraploid males, an interspecific tetraploidy induced by blunt snout bream ( Megalobrama amblycephala ) ♀× black bream ( Megalobrama terminalis ) ♂, with blunt snout bream females. The fertilization rate was high in the interploid hybrids. Although significant ( P <0.05) mortalities were observed at hatching, swim‐up and 30‐day stages, respectively, the survival percentage of the interploid hybrids became stabilized after the 60‐day stage. In different interploid hybridization batches, 64–97% of juveniles were identified as 3n and 1–36% as 2n. Less than 2% of tetraploids were obtained in these interploid hybridization batches. The daily growth rate of the interploid 3n increased 7.5%, compared with that of diploid blunt snout breams during the 180‐day culture. Moreover, a method using seven morphological parameter ratios was set up with a relatively high classification accuracy of 93.8% to harmlessly discriminate interploid 3n from allo‐tetraploids, black bream and blunt snout bream.