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This fish has an undivided double tail, with the tail splayed sideways and forwards. It was developed in Japan from the ryukin, and is uncommon outside Japan.
Tosakins were bred for viewing from above, and much of the effect of the spectacular tail is lost when viewed from the side. This is the only recognized goldfish variety with an undivided double tail: the two layers of the tail are split apart and grow separately from each other but are joined along the top edge (although, in that the tail is splayed sideways, it no longer appears to have a conventional top edge). See Background Information for an explanation of goldfish finnage.
The British standard for the tosakin is under development and should be published in early 2010.
The body and finnage are as in the Fantail, apart, of course, from the tail. Tosakins are probably all of metallic rather than calico colouration.
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Adult tosakin with well developed tail. Photographed at GSGB 2009.
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Young adult red-white variegated tosakin, shown at GSGB 2005.

Young adult red-white variegated tosakin, shown at GSGB 2009.
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Young adult red tosakin, shown at GSGB 2005.