the average length for adult in the continental rivers can be 2.9 to 4 m (9 ft 6 in to 13 ft 1 in) long. males weigh up to 382 kg (842 lb). females can be 2.5 to 3 m (8 ft 2 in to 9 ft 10 in) and weigh up to 173 kg (381 lb).