What qualifications or GCSE's or degrees do you need to work in a large aquarium?

i love sea life, it just fascinates me, it always has. i have always loved gong swimming in the ocean ( haven't been in ages all that's swimming in the beach near me are used condoms and cider cans). but anyway im 14 and so far in my life i have no clue what i have wanted to be, im not really good at anything at all really and its getting to the time where i need to decide what to do in my life at least that's what my parents and teachers say, personally i think i have ages to find myself. but whatever its not really my life is it. i have thought of a job that i would actually like to get up for in the mornings and that is too work in a aquarium. im always going to be local one, its really small and i would want to work in a large one. im doing a work experience there for a week in july (its a school thing that you have to do, i cant wait). what qualifications do you need to work with the fish and feed them and give tours. i would love that !! i can see myself working in one. please help me !