In plain words
The poet, of Tirukkōṭṭiyūr: In the waters of Tirukkōṭṭiyūr young vāḷai fish play at their mischief [driving off the smaller fish], leaping onto the backs of tortoises and going on, battering the pure flowers; those hard-hearted burdens on the earth who give no thought to him whose broad hand holds the discus there: take away the rice they eat and stuff them with grass [the food of cattle]!