There are two main reasons why yellow croaker in Sandu Port is expensive. First of all, yellow croaker is delicious and rich in nutrients such as protein, calcium, phosphorus, iron, riboflavin and nicotinic acid, which is deeply loved by consumers. Due to human overfishing, the number of yellow croaker has dropped sharply, so the price is higher. Secondly, the yellow croaker in Sandu Port is fed with high-quality bait with good quality and high freshness, so the price is relatively high. But the price is very high.