nah its not illegal. technically the pond is in my dad's land cause its directly behind my residence where my dad bought the land. we just havent developed it so it doesnt have walls or gates. its become a kind of a public community place where my neighbours chill in the shaded cabbanas and fish. so yeh i can put anything i want there. i dont stop people from putting their fish either. im just afraid of the snakeheads cause they r huge and scary....dangerous for small kids.