Herrings are small fish that don't eat anything and the first fish to encounter. Like small fish, they come in schools and don't give many points. They are preyed on by cod, lionfish,humphead wrasse, john dorys, marlins, pompano, tuna, leopard sharks and orcas. They last appear in Room To Move and come in 2 sizes, baby and adult. They appear 20 times in the game or 1/3 of the levels in total.
Herring will also come in schools. See schools for more info.