Cypriniform fish and Poeciliid fish

Cypriniform fish noun - A soft-finned fish of the order Cypriniformes.

Poeciliid fish and cypriniform fish are semantically related. In some cases you can replace phrase "Poeciliid fish" with "Cypriniform fish", this phrases are similar.

Poeciliid fish noun - Small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control.

Cypriniform fish and poeciliid fish are semantically related. You can use "Cypriniform fish" instead a noun phrase "Poeciliid fish".