About 30 centimeters. Perch is flat and long, so 500 grams of perch is about 30 cm long. Perch has a high nutritional value, and is rich in protein, fat, carbohydrate, vitamin A, vitamin B, vitamin D, vitamin E, calcium, magnesium, zinc, iron, phosphorus, potassium and selenium. When selecting perch, it is recommended to choose 1- 1.5 Jin, which is rich and tender.