How many shellfish do European green crabs eat a day?

The European green crab (Carcinus maenas) is an invasive species that has caused significant ecological damage in many parts of the world. One of the ways that this crab has had a negative impact is by its predation on shellfish. Studies have shown that European green crabs can consume a large number of shellfish per day, depending on the size of the crab and the availability of food. For example, one study found that an adult female European green crab could consume up to 47 shellfish per day, while a smaller juvenile crab could consume up to 16 shellfish per day. Another study found that European green crabs consumed an average of 38 shellfish per day.