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Erns
The Japanese use the terms tosai, nisai, sansai etc to fish depending on how many growing seasons they have been through. If I'm not mistaken when tosai from say last year's spawn are getting ready to be put back into the mud ponds they are called aka nisai and when they're harvested they are called nisai. This happens each year with progression to aka sansai-sansai, aka yonsai-yonsai and so on.
A lot of fish are really younger than this age factor given to them by the breeder. A lot of nisai are actually as young as 14-15 months yet have gone through 2 growing seasons.
Mike
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