Size-specific spawning pattern in ayu , Plecoglossus altivelis
Size-specific spawning pattern in ayu , Plecoglossus altivelis
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香鱼的特定尺寸产卵模式
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Plecoglossus altivelis
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Plecoglossus altivelis
The spawning pattern and relationship to body size at maturation of amphidromous and land-locked forms of ayu, Plecoglossus altivelis, was investigated. Ovarian eggs of prespawning females showed a multimodal size distribution, regardless of body size, indicating that all the females were potentially a batch spawners. The spawning schedules of individual fish were described under simulated spawning conditions. Most large-sized females died soon after their first spawning, whereas approximately half of the medium and small-sized females successfully completed a second spawning some two weeks after the first. Such a size-specific spawning pattern was common to both forms, but development of a third batch of ovarian eggs after the second spawning occurred only in the land-locked form. Spawning tactics in ayu were related to offspring survival and adult mortality during spawning season.
