''Rhodeus suigensis'' is a

temperate In geography, the temperate climates of Earth occur in the middle latitudes (23.5° to 66.5° N/S of Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ranges throughout ...

freshwater

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of ...

belonging to the

Acheilognathinae The bitterling-like cyprinids form the cyprinid subfamily Acheilognathinae. This subfamily contains four genera, although the Khanka spiny bitterling is often placed in ''Acheilognathus'', and at least 71 described species to date. Over half of t ...

subfamily of the family Cyprinidae. It originated in inland

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...

s in Japan and the

Korea Korea ( ko, 한국, or , ) is a peninsular region in East Asia. Since 1945, it has been divided at or near the 38th parallel, with North Korea (Democratic People's Republic of Korea) comprising its northern half and South Korea (Republic o ...

n peninsula. It was originally described as ''Pseudoperilampus suigensis'' by T. Mori in 1935, and has also been referred to as ''Rhodeus atremius suigensis'' in scientific literature. The species was listed as

endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and in ...

in 1994 by the

World Conservation Monitoring Centre The UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC) is a collaboration centre of UN Environment Programme, based in Cambridge in the United Kingdom. UNEP-WCMC has been part of UN Environment Programme since 2000, and has ...

, but in 1996 was relisted as "data deficient". When spawning, the females deposit their

eggs Humans and human ancestors have scavenged and eaten animal eggs for millions of years. Humans in Southeast Asia had domesticated chickens and harvested their eggs for food by 1,500 BCE. The most widely consumed eggs are those of fowl, especial ...

inside bivalves, where they hatch and the young remain until they can swim.

References

Fish described in 1935 suigensis Taxa named by Tamezo Mori Taxobox binomials not recognized by IUCN {{Acheilognathinae-stub