持続的な高・低水温,長・短日長下での雌キンギョの再成熟〔英文〕

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Under natural conditions, some fish spawn in July-August but the majority spawn in the following March-June. The plasma E2 was at high levels in July and March-April, very low in JanuaryFebruary and rather high in other months. When transferred from natural daylength at 24°C to 12L or 16L combined with 24°C on June 22, only a few fish spawned at 24°C/12L with the majority at 24°C/16L in the first 2 months. Then, almost all fish stayed immature for about 11 months. Plasma E2 was low and GtH rather high on both regimes. When transferred to 16°C/12L or 16°C/16L, most fish spawned 1-2 times in the first 2 months. At 16°C/16L spawnings were repeated till the 16th month, although intervals were lengthened, while at 16°C/12L spawnings were interrupted for 4-5 months and then resumed. At 16°C/12L, plasma E2 was low in the first six and last 3 months but were high in other months. At 16°C/16L, the E2 fluctuated at rather high levels. The plasma GtH in individual fish in both regimes fluctuated frequently at high levels. At the end, most fish in both regimes were immature and the plasma E2 and GtH were rather low.
日本水産學會の論文