How long does it take for clams to spit sand?

After standing for 2~3 hours, you will see that most of the clams have opened their shells, the water is turbid, and the clams spit sand.

Meretrix meretrix: Also known as Meretrix variegata or Clam philippinarum, the shell is 2.5~5.7 cm long. The general commercial scale is 40 mm. It is a common shellfish. The shell is firm, and the shell petals are equal left and right; The two sides are unequal, and the top beak of the shell is located in the first half; The shape is slightly oval. Ligaments are embedded, not protruding from the shell surface, and the broad brown oval arch extends almost to half of the rear edge. It is a shellfish product, which is widely distributed in the north and south seas of China. Rapid growth, short culture period, strong adaptability (wide temperature, wide salt and wide distribution) and long survival time without water. It is an excellent shellfish suitable for artificial high-density culture and one of the four major cultured shellfish in China. It is a variety from the western Pacific subtropical zone to the low cold temperate zone, distributed in the temperate zone of Europe. Wild populations are distributed in the Philippines, South China Sea, East China Sea of China, Yellow Sea, Sea of Japan, Sea of Okhotsk and South Kuril Islands. Its breeding began with the traditional fishing activities in these areas, that is, collecting wild clam seedlings.