Fish don't go to school because their books would get wet.
Eventually, the paper will desintegrate and Mr. Dad Fish will have to expend more money on water resistant books, probably made of plastic. In order to afford those new books, Dad Fish will need to work over 16 hours a day. Mrs. Fish will be unhappy and she will dump him.
Now, Mr. Fish is alone, keeping a fry of 45. He will hardly sleep, and after 6 weeks of non-stoping work, he'll jump outside of the water and end his suffering.
The now semi-adult fry, will find shelter in Don Fishone's house, their GodFather. They will grow ip watching him and his minions lurking around the sea, threatening other fish and stealing their goldfish flakes.
But this one day, when Fishic, the eldest brother, is presented to her now dying mother, decides to become a protector. He'll turn into SuperScales, and will face his Godfather's evil empire.
After a series of unfortunate events, which took all his brothers' lives, he challenges Don Fishone. Good vs. Evil. Black vs. White.
The fight begins. There are rotten fins all around, and only one fish standing on his fins: SuperScale.
Now, after returning to his old personality, Fishic decides to be a good person again, and starts going to school again.
p.s. I've been working all day long--- my mind is elsewhere -- this typing has been done automatically by my big toe while I was sleeping.