During the project, sex-reversed tetraploid males were also produced by 17 a-methyltestosterone
0.5 mg MT Ž rkg food, 60-day oral administration after the beginning of
feeding . Thus, mass production of all-female triploids was made by crosses between .
normal diploid females and sex-reversed probably XXXX tetraploid males. All-female Ž .
triploids were also produced by crosses between tetraploid females and sex-reversed
Ž. Ž XX diploid males. The latter triploids exhibited better hatching rates 72.0–86.4%; no
data of fertility than the former ones 29.3–37.3% , probably due to a lack of the . Ž.
problems of large sperm head size in tetraploids Nagano Prefectural Fisheries Experi- Ž
mental Station, 1996 . Since 1996, the research has been oriented to produce all-female .
allotriploids using sex-reversed tetraploid rainbow trout males and diploid females of
other species Nagano Prefectural Fisheries Experimental Station, 1997, 1998 .
During the project, sex-reversed tetraploid males were also produced by 17 a-methyltestosterone0.5 mg MT Ž rkg food, 60-day oral administration after the beginning offeeding . Thus, mass production of all-female triploids was made by crosses between .normal diploid females and sex-reversed probably XXXX tetraploid males. All-female Ž .triploids were also produced by crosses between tetraploid females and sex-reversedŽ. Ž XX diploid males. The latter triploids exhibited better hatching rates 72.0–86.4%; nodata of fertility than the former ones 29.3–37.3% , probably due to a lack of the . Ž.problems of large sperm head size in tetraploids Nagano Prefectural Fisheries Experi- Žmental Station, 1996 . Since 1996, the research has been oriented to produce all-female .allotriploids using sex-reversed tetraploid rainbow trout males and diploid females ofother species Nagano Prefectural Fisheries Experimental Station, 1997, 1998 .
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