Coral reefs also face many other threats including pollution, overfishing, and overharvesting coral.

珊瑚礁还面临许多其他威胁， 包括污染、 过度捕捞和过度采伐珊瑚。

He said decreases in oyster numbers in the second half of the 1900s followed a more severe decrease in the 1920s from widespread overharvesting.

他说，由于大规模的过度捕捞， 20世纪下半叶牡蛎数量减少在此之前，20世纪20年代牡蛎数量减少的情况更为严重。

For over 700 years local farmers cultivated oysters here in the mud flats of Pak Nai and recent decades, traditional oyster farming has declined due in part to coastal reclamation and overharvesting.

700多年来，当地农民在白泥的泥滩上养殖牡蛎，而近几十年，传统牡蛎养殖逐渐衰落，造成这一结果的部分原因是沿海填海和过度捕捞。