gangs are wearing the sharks jersey. lloyd lacuesta tells us that team colors often claim turf. >> reporter: as the sharks make a run at the stanley cup, san jose will become a city of teal. the color has been adopted by san jose gangs. another day in the shark city the livics in this video. notice one of the members is wearing a sharks' jerseyy. >> there is an old saying you are claiming your city. and if you are wearing a certain sports attire that tice you to that city. >> reporter: sergeant jason dwyer worked in the gang unit and some have sharks tattoos. >> many gangs identify with the sharks hockey team. >> reporter: san jose's largest gangs identify with the colors red and blue but both identify with the sharks to claim san jose as their turf. >> you have them both wearing the paraphernalia to