Retarded Growth of Hexaploid Loaches

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  • 六倍体ドジョウの成長低下

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Abstract

In the lach Misgurnus anguillicaudatus, hexaploid individuals were produced by chromosome manipulation to inhibit the second polar body release after the fertilization of diploid eggs from natural tetraploid female by sperm from tetraploid male. Eggs of mature hexaploid (6n) female were fertilized by sperm of diploid (2n), tetraploid (4n) and hexaploid (6n) males, respectively, to produce tetraploid (6n female×2n male), pentaploid (6n×4n) and hexaploid (6n×6n) progeny. Each group was reared in a separate tank until the age of 1 year old and then long-term communal rearing experiments from the age of 1 year old to 3 years and 2 months old were carried out to compare performance of tetraploid, pentaploid and hexaploid loaches under a laboratory condition. At the end of experiments, significantly retarded growth was observed in hexaploid loaches and they exhibited about half body weight of counterpart tetraploid and pentaploid loaches. Hexaploid loaches also showed significantly lower body length/head length proportion than other polyploids.

Journal

  • Aquaculture Science

    Aquaculture Science 52 (3), 279-286, 2004

    Japanese Society for Aquaculture Science

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