Subhaan Ali was found four hours after he was seen going into the water at Stone Row Way, Rotherham, on Thursday.
A firefighter previously suggested the boy had been involved in "tombstoning", which involves jumping or diving into water from a height.
South Yorkshire Police said there were no suspicious circumstances but was continuing to investigate.
Det Insp Graham Stead said: "We will continue to provide support to the family and provide the necessary information to the coroner."
An 11-year-old boy whose body was pulled from a canal has been formally identified.