Adorable footage shows two youngsters splashing around in tiny pools filled with giant koi carps.

The fish breeder, 42, put the valuable ornamental fish in plastic blue tubs for their mid-year health check up on July 9.

His sons Taechin, 8, and Nischin, 4, climbed into the temporary homes with the fish, splashing around with them in Nan, Thailand.

The fish, with a combined valued of thousands of dollars, didn't seem to mind their new companions.

Worawut, who shows the fish in competitions, said: ‘’It looks like we will need to buy bigger bowls in the future to put the carp in.

‘’The boys love sitting in the water and playing with the fish. It’s their favourite time of the year.

‘’We check the carp for size, weight and general health. Taechin and Nischin like to join in. The fish are nearly as big as them.’'