That's not a surprise...that is a fishpond! Some pond raise Milkfish others raise Prawn, Crabs or other fish. When it is time to harvest the product they drain the fishpond to be able to catch the fish or other seafood hence what is left in the mud are gathered to clean the pond, there are lot of fishpond in the Philippine hence it is not only in kALIMANTAN!
Bang kasih wareng d atas tong nya iket pakek karet ban dn kasi bolong dikit buat masukkin ikan ama udang nya biar aman abang gk takut ikan atau udang keluar dgn mudah dr ember nya bang