Sex ratio and growth performance of gynogenetic diploid barfin flounder Verasper moseri
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The effects of rearing temperature and genetic factor on the sex ratio of normal and gynogenetic diploids were examined in barfin flounder Verasper moseri. In addition, growth performance at the age of 6 to 34 months after hatching was also examined. In 16℃ (16.1±0.14) group, the percentage of females in gynogenetic diploids (G1) and normal diploids (2N) was significantly lower than in 14℃ (13.6±0.33) and 12℃ (12.0±0.30) group. However, no clear difference wasobserved in the female rate between 14℃ and 12℃ group. These results indicated that rearing temperature affects the sex ratio of both G1 and 2N, and high temperature (16℃) condition induced male-biased sex ratios. Among gynogenetic strains, female rates widely varied from 7.0% to 95.1% in the 14℃ and 12℃ condition. However, several cases exhibited high female rates (89.5 to 95.1%), suggesting that this species essentially has the male heterogametic (XX female-XY male) sex determination system. At 34 months, body weight of G1 (1569.0±328.4 g) was significantly heavier than 2N (866.6±283.8 g). Survival rates of 2N and G1 from 6 to 34 months were98.0% and 96.0%, respectively. These results indicate that the group with a high percentage of females showed better growth.マツカワ Verasper moseri 雌性発生二倍体及び通常発生群の性比に及ぼす水温と遺伝的要因の影響，並びに成長の違いを調べた。第二極体放出阻止型雌性発生二倍体（G1）および通常発生群の雌比率は，12℃（12.0±0.30）及び14℃（13.6±0.33）飼育群では明確な違いがみられず，16℃（16.1±0.14）飼育群で常に低下した。また，G1 の雌比率は7.0～95.1%と雌親魚によって変動した。このことからマツカワの性比は，水温と親魚の影響を強く受け，特に高水温や親魚の違いが雌比率を減少させていると考えられた。しかしながら，雄ゲノムの影響のない雌性発生のいくつかの事例で，89.5～95.1%の雌比率を示したことはマツカワの性決定様式が基本的に雄ヘテロ型（XX-XY型）の可能性が大きいと考えられた。飼育試験の結果，雌比率の高い群の成長における有利性が示された。
- 2011-09-20
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