稀に流通しますが殆んど市場に出回ることがありません。ホシザキグリーン財団発行の「金魚・銀魚・鉄魚」いう書籍を持っているのですが、タイトルの割には記述も少なく情報が掴めない品種です。体色についてはイロイロ言われますが、青文魚と同じと言ってよいと思います。(青文魚ですら個体差が激しいので)
If you imagine a lionhead without the hood, a pompon without the frilly nasal septa and a celestial or bubble eye without the eye modifications, then the remnant is the same - the eggfish, its body shorter and deeper than the common goldfish and resembling the shape of an egg, hence the name. Hardly seen in the West, it is kept as a separate variety in China and Hong Kong and (see History under About Goldfish) is the precursor to the aforementioned varieties.
The phoenix eggfish (also called the egg phoenix) has long, as opposed to short, tail lobes and is named for its long, fine tail after the legendary phoenix. The pearlscale eggfish has domed scales as in the pearlscale. Lately the term eggfish has been extended to include long-bodied dorsal-less fish.
The eggfish is known as the maruko in Japan.