Dave, of Hurtis Hill, Crowborough, said: "There are about thirty thousand different fish species worldwide so the ones I have caught so far are just a small sample. "I haven't given up on any of the others yet. "I'm currently on the hunt for a ten-spined stickleback from one of my local dykes." The stickleback is about 4cm in length and is the smallest freshwater fish in Britain. The capture of such a tiddler is the subject of academic debate.