revision preference src: Generally, the fish range from 25 to 40 centimetres in length, and weigh about 1000 grams. However, specimens have been recorded up to 50 cm long and 1.5 kg in weight. <SEP> tgt: Generally, the fish range from 25 to 40 centimetres in length, and weigh about 1000 grams. Specimens have been recorded up to 50 cm long and 1.5 kg in weight.