I've been looking at recent activities and saw that some pages have some categories that belong only to that fish, and many of them (ex. Category:Gobies only for Yellowfin Goby, Category:Chiclid for Peacock Bass). If you are doing it just for badges, STOP. Badges are not showing how helpful you are to the wiki, nor they raise your chances of being Admin. If you are doing it for calssification, it's not useful when it is only for one page.