Aquarium enthusiasts are often on the lookout ... actually a generic name that’s used to describe many kinds of ray-finned fishes. It mostly refers to one specific family of freshwater fish.

As their name implies, rainbow sharks have more aggressive personalities than many other ray-finned fishes. They’re considered a semi-aggressive breed in aquarium environments. Luckily ...

Matthew Davis of St. Cloud State and colleagues analyzed 10 nuclear genes and one mitochondrial gene from 301 taxonomic groups of ray-finned fishes, which comprise the vast majority of fish species, ...