Caproberyx is a species of fish from the Cretaceous period of Africa and Europe, but it has been found in Kansas, USA. It was a small fish that often formed schools for protection.
In The Land Before Time
Caproberyx appear a few times in The Land Before Time IX: Journey to Big Water. A school of them first appears in the opening, where they are seen swimming behind a school of Protosphyraena. Later in the opening, a school is shown swimming before being scared off by a Pteranodon and swimming away. Two schools of Caproberyx also appear at the end, with one school swimming while Littlefoot is looking at Mo's home, and another swimming past Littlefoot before he nearly drowns and is saved by Mo.