First of all, people can eat more and more kinds of seafood in the market. The types of seafood that consumers can choose are not limited to crabs. When buying seafood, people will buy some other seafood according to their own preferences, so the sales of crabs will be greatly reduced.
The second reason is related to the crab farmers themselves. In the past few years, the price of crabs was relatively high and the sales volume was relatively good, so many other people would choose to breed crabs. However, after the increase in crab production, the total number of people who like to eat crabs in the market has not changed much, so it will cause oversupply and crab farmers can't sell crabs.
Part of the reason is the dealer of river crabs. Some merchants will mix some bad quality crabs with good quality crabs to deceive consumers with inferior products. After consumers found out, they naturally didn't want to buy crabs the next year.
Finally, some are rumors. Now it is widely rumored on the Internet that some crabs are raised with some chemicals or in other unhealthy ways. Although the credibility is not high, people will still be more worried about food safety, and the number of people who buy it will naturally decrease.
In fact, crabs are unsalable not only this year, but also in previous years. Crab farmers can try to change other marketing methods and sell crabs.