beautifl fish = 綺麗な魚（きれい な さかな）　kirei na sakana kireinasakana The second one "Kireii Sakana" doesnt make sense; however, if some one says them separately "Kirei (beautiful)" and "sakana (fish)", it could be ok..... For instance, "hey look! fish!! beautiful!" or "ne mite! kirei! sakana!!"