Scallop, this is based on Bernoulli principle. If you suddenly squeeze water into a narrow passage, the water will accelerate. Therefore, it is not enough for scallops to travel by action and reaction, but also by Bernoulli principle.
People swim by pushing their limbs back, but scallops think differently. One of its adductor muscles degenerates, but the other one becomes big enough to provide it with swimming power.
In fact, compared with other shellfish, the overall shape of scallop is very suitable for swimming: it is very flat, almost symmetrical, with rounded shell edges and very flexible joint between the two shells. As long as you quickly open the shell, absorb water from the front, then cover the front opening with the edge film, then try to close the shell and spray the water from the back, you can swim.
The lifestyle of scallops
Like other bivalves, scallops eat passively, that is, filter food with gills. It mainly eats tiny phytoplankton, zooplankton, bacteria and organic debris. Among them, diatoms are the main phytoplankton, followed by flagellates and other algae; Among zooplankton, there are copepods and planktonic larvae of invertebrates.
After moving to a new suitable environment, the scallop lies still on the bottom of the water, and the foot silk is re-secreted by the foot silk gland and fixed on rocks or other objects. Because the right shell of scallop is large and the left shell is small, after being still, the right shell is at the bottom and the left shell is at the top.
The secretion ability of Chlamys farreri foot silk is related to water temperature and individual size. The experimental results showed that the individual size of Chlamys farreri was 65438±0.0cm and 2.0cm±3.0cm in seawater at 65438 03.5℃, and the attachment speed was faster than that of Chlamys farreri, but Chlamys farreri was easy to attach and change its position.