For the strategy to succeed in trapping the animals, Chen Wen needed to exert precise control.
He first went ashore, piling up mud around the channel, to facilitate immediate blockage.
Once prepared, Chen Wen again observed the distant crocodile and used a drone for a careful survey of the surrounding waters.
After confirming no Nile crocodiles were in the water, Chen Wen slowly entered the water, moving to the rear of the group of Egyptian Catfish.
The catfish were unaware they had been targeted by Chen Wen and continued searching for food in the water.
But just as they were happily enjoying their meal, Chen Wen sprang into action.
He swung his spear, stirring the water, causing the catfish to become suddenly alert.
Because Chen Wen was in the direction of the catfish's deep water escape route, most of them chose to flee in the opposite direction, into the channel.
Only a few catfish dared to escape past Chen Wen or to the sides.
This surprised Chen Wen pleasantly.
