Taxonomy & naming
Zacco platypus was described by Temminck and Schlegel in 1846 in Fauna Japonica, with Japan as the type locality. Authors have long used the name for a wide-ranging stream fish of China, Korea, Japan and Taiwan, and populations in different regions are not always treated alike. This page follows the Catalog of Fishes and FishBase, which give Zacco platypus as the valid name. The family is Xenocyprididae in current classifications.
Morphology
A streamlined, silvery chub with a fairly large mouth. FishBase gives a maximum of 9 in TL for males or unsexed fish. Males in breeding condition are the more colourful sex, with a longer anal fin.
Habitat
FishBase gives the range as northern China to northern Vietnam. The fish is common in streams and rivers with rapid flow and is absent from deep or stagnant water. It is classed as benthopelagic and subtropical, with a recorded temperature range of 10 to 22 C.
Feeding
FishBase lists zooplankton, small crustaceans, macroscopic algae, small fish and detritus. The species is an omnivore that feeds through the water column and at the surface in current.
Mating
Spawning behaviour is not recorded in the FishBase entry. Males of Zacco chubs court with brighter colour and a lengthened anal fin.
Breeding
Egg number and spawning season are not recorded in the FishBase entry.
In the aquarium
A fast, active chub for a large, cool, well-flowing tank or pond. FishBase's 10 to 22 C range points to unheated water; do not keep it in tropical-temperature community tanks. Give it a long tank with strong flow and good filtration, and keep a group. Adults take small fish, so do not house them with small tank mates. It jumps readily, so keep the tank covered.
Conservation
FishBase lists the pale chub as Least Concern on the IUCN Red List, assessed 11 January 2023. It is abundant over much of its range.