I think it was a stupid, unproductive and pointless move from the Buddhists but... eh, religion. They essentially dumped food on the sea.
Well, yes of course humans are the only living creatures that would/could have been effected by this, right?
Extra food appearing in the sea? Maybe another living creature had an unexpected meal? Maybe one, or some of the lobsters were pregnant, and gave birth between the time it was released, and the time it was recaught.
That, or maybe a billion other things, or none of them.
Maybe stupid, unproductive and pointless if one can only imagine something from the perspective of your own species.
What happened was all part of the big cosmic wheel of life, and it's not necessary to know why.