I have heard that Ayu's lifespan is fairy short at 1-2 years. Is this true?
Edward Venn wrote:
> Okaay, let's see.... I've got my "Guide to The Fishes of Japan by Yamakei
> Pocket Guides. Leuciscus hakonensis is a 30cm fish that migrates up rivers
> to spawn. They are found in the Chugoku Region (Central Honshu) and spawn in
> June and July. There are 3 other related species.
> The Ayu, Plecoglossus altivelis altivelis, follows a similar lifestyle.
> Other members of this family can be found as far as Taiwan.
> Zacco sp, are as you mentionned trout like cyprinids that inhabit coldwater
> regions of the rivers north of the Kanto Plain. I've seen them in the Toné
> River and in the Moto Arakawa. They prefer clear running water not warmer
> than low 20's(C) and school in groups of 5-10. They breed in early May and
> June when the temperature rises. Males develop breeding tubercules and spend
> time creating sheds in the river bed. Competition is fierce and fishermen
> usually take advantage of this to catch them by putting a female on a lead
> and snagging males that try to cover and lead her to their nest. Breeding is
> similar to a trout's and they pay no further attention to the eggs after the
> I have seen them kept in aquariums, a chiller and brisk areation is
> necessary. They seem to be hard to wean onto anything other than live foods,
> preferred prey are helgramites.
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