Guardian: Phoebe Lester
According to Wikipedia; a gang is a group with identifiable leadership and internal organization, identifying with or claiming control over territory.
This means that a school of Neon Damsels are like a New York Street Gang, displaying their bright blue Gang colours to other Damsels nearby. The Surgeonfish are like the Japanese Yakuza carrying poisonous tail spines like knives, fusiliers are the Colombian Drug Cartels controlling what comes into the reef, bands of surf parrotfish, poison-spined rabbitfish and Goatfish are like the Chinese Triads sweeping over the bottom. Six-barred Wrasse hoon over the top of Coral heads like the Irish Mob and Spined Squirrelfish and Lionfish are discreet members of the Order of Assassins that come out at night or lurk in the shadows. Sweetlips gather on the edges of coral being massaged by cleaner fish like Godfathers in the Italian Mafia and schools of Bumphead Parrotfish arrive and terrorise the community like Hell’s Angels.