What kind of food does clam eat?

Clam is a family of molluscs, distributed in Asia, Europe, North America and North Africa, living in freshwater lakes, ponds, rivers and other underwater, semi-buried in the sediment, because it has a lot of breeding advantages and development prospects, has become the preferred breeding project for many farmers, let's take a look at what mussel eat!

What kind of food does clam eat?

The main food of clam is unicellular algae, protozoa and organic detritus, such as rotifer, flagellate, green eye, green alga, Scenedesmus, navicular algae, dinoflagellate, tetragonal algae, spindle diatom, rod star algae, crustacean residue and plant leaves, etc. Diatoms are the main ones that are easily digested. Clam can not actively chase food, rely on the opening and closing of the clam shell, the swinging of the inner mantle cilia and Gill cilia cause the current, and the food enters the clam body with the water. The food enters the mantle cavity with the water, the particles move upward along the Gill filament to the base of the Gill, and then move forward to the lip flap. After the lip flap selection, the small particles enter the mouth, while the large particles move backward from the edge of the inner Gill. At the intersection of the two gills, they enter the mantle scar to the back end, and the two shells are suddenly closed out of the body. According to some statistics, the water flowing into the mussel body can reach 40 liters every day.

Habitat of clam

In the natural environment, clams generally live in muddy, sandy or gravel, such as rivers, lakes, ponds, streams, etc. When it is cold in winter and spring, the axe foot is used to dig mud fen, so that part of the clam body is buried in the sediment, the front ventral edge is down, the back edge is up, and only the rear edge of the shell is exposed for breathing and feeding. When it is hot, most of it is exposed to the mud. Anodonta generally lives in still water with a pH value of 5-9 or slow-flowing fertile water.

The digestive system of mussel

The mussel mouth is closed under the muscle in front of the position, which is a transverse seam. Each side of the mouth has a pair of triangular lips, large, dense cilia, sensory and feeding function. Behind the mouth is a short and wide esophagus, connected with a dilated stomach, and there is a pair of livers around the stomach, which can secrete amylase and sucrase and have ducts into the stomach. The posterior part of the stomach is the intestine, which is bent in the visceral mass, and then enters the heart, the rectum passes through the ventricle, and the anus opens on the posterior adductor muscle, near the outlet canal. There is a crystal rod between the stomach and intestines, which is a slender rod, the front end is thicker, and the top shape varies greatly, showing fine tip, dilatation, hook shape, disc curvature and so on. The crystal rod is located in the intestine, and its front end protrudes in the stomach and connects with the lower part of the gastric shield. The crystal rod may be stored food. under the condition of lack of food, the crystal rod disappears after 24 hours, re-feeding, and resumes after a few days.

Culture methods of clam

The main results are as follows: 1. at present, hanging culture and cage culture are mostly used in clam culture. The methods of hanging and raising include single raising and string raising of more than two clams on the same line. The number of cages depends on the size of the cage (net cage, net clip), and it is generally appropriate that each clam can touch the bottom of the cage.

2. The general mu culture ponds of Yuzhu river clam are 800,1200 and 600,800 respectively. The culture density depends on the body weight and fatness. The physical, chemical and biological factors such as water flow and water depth increase or decrease appropriately with the size of the mussel.

3. Clam culture has become the main production content of the comprehensive development and utilization of external fishery in our city. In order to fully tap the production potential of water body, the ponds dominated by pearl cultivation can breed grass carp, mackerel, crucian carp, mandarin fish, yellow catfish and a small amount of silver carp and bighead carp.