CATDOLL : CATDOLL: What is the difference between river clams and pearl clams?

1. What is the difference between river clams and pearl clams?

River mussels

It is a general term for a class of animals in the family Unionidae of the phylum Mollusca. In some places, it is called mussel shells or clam shells. It lives at the bottom of freshwater lakes, ponds, rivers, etc., half buried in mud and sand. The meat is edible and can also be used as bait for fish and poultry and feed for poultry and livestock.

In some areas, it is used as a freshwater pearl oyster, mainly the triangular sail oyster and the pleated crown oyster. The water inlet and outlet pipes at the rear end of the oyster are exposed, and water can flow into and out of the mantle cavity to complete the functions of feeding, breathing, and excreting feces and metabolic products, filtering microorganisms and organic particles in the water, and eating small microorganisms.

Pearl oyster

A type of clam, a family of the order Oligaria, class Bivalvia. The shell is long and oval, with a thick, well-developed nacre layer and often concentrically carved patterns on the top of the shell. There is a large central tooth at the hinge. There are no gill water tubes. There is no clear distinction between the openings of the gills and the anus. Both pairs of gills form a brood pouch. The larvae of the hook shell are hookless. It is produced in freshwater. For example, the pearl oyster Margarita margaritifera (Linnaeus) can produce pearls, which can be used for medicinal purposes, and its shell can also be quickly used as mother-of-pearl for medicinal purposes.

River mussel Anodonta

Lamellibranchia is a general term for shellfish of the genus Lamellibranchia, subfamily Lamellidae, family Lamellibranchia. They are found in Asia, Europe, North America, and North Africa. Most of them can form pearls naturally in their bodies.

The appearance of river clams is oval and ovate. The shell is thin and fragile. The two shells are swollen, and the back sometimes has a hind wing. The top of the shell is wide and slightly raised, located in the middle or front of the dorsal edge. The shell surface is smooth, with concentric growth lines or green radial lines from the top of the shell to the ventral edge. The glue is narrow and has no teeth. The axe foot is well developed. The sexes are different. The eggs are fertilized in spring and can develop into glochid larvae in about 2 months and be expelled from the body. If the eggs are fertilized in autumn, the embryos will hibernate in the mother's body and develop into glochid larvae in the spring of the following year. After being expelled from the body, the glochid larvae need to parasitize on the fish body. After developing into young clams, they will leave the fish body, sink to the bottom of the water, and live freely. The meat is edible and is also a natural bait for fish and poultry, and a feed for livestock and poultry. Some species can be used for freshwater pearl cultivation.

The common species of Chinese hornless clam (A. woodiana woodiana) has a shell length of up to 200 mm, and is angular and oval in shape. The two shells are swollen, with wings on the rear edge of the back. There are three ribs on the back that emanate from the top of the shell, and the lowest rib is located on the midline of the shell. It mostly lives in muddy bottoms, slow-flowing and still waters, and is distributed in rivers, lakes, reservoirs and ponds. It is dioecious. In Jiangsu, the gonads mature in March, and the mature eggs are fertilized and developed in the gills of the female body. Around April to May, the larvae of the hook shell mature and are discharged from the body, parasitizing the fish body. After developing into a young clam, it sinks to the bottom of the water to live. It is a freshwater pearl oyster, but the pearls produced are of poor quality. The meat is edible. The shell is a Chinese medicinal material.

At present, pearl oysters are all cultivated artificially and on a large scale. At present, there is only one species of scallops for sale. The ones you can pick up in rivers, ponds, and birdbaths are definitely not worthy of being pearl oysters.

Clams are shellfish that live in rivers, lakes, and swamps. There are many types of clams.

There are two common types. One type likes to live in flowing rivers. Their shells are thick and have teeth on the back of the two shells. The nacre layer of the shell is thicker. They are called pearl oysters. The other type likes to live in calm ponds. Their shells are thin and have no teeth on the back of the two shells. They are called pond oysters. Their bodies are very soft and their mobility is very low. However, they have two hard, calcareous shells to protect their bodies. When they encounter enemies attacking them, their soft bodies will immediately shrink between the two shells and close the two shells tightly, forming an impenetrable "iron wall".

2. What kind of species is the golden river mussel?

Ornamental species. The Golden River Mussel is an ornamental species of river mussel commonly seen in flower and bird markets. River mussels are a general term for a class of animals in the family Mussel of the phylum Mollusca. In some places, they are called mussel shells or clam shells. They live at the bottom of freshwater lakes, ponds, rivers, etc., half buried in mud and sand. The meat can be eaten by the tribe, and can also be used as bait for fish and poultry, and as feed for poultry and livestock.

3. Where in China are the largest clams produced?

In China, the most abundant distribution of river clams is in the Changhaoshen River Basin. Guo Liang said that Nanjing is one of the model origins of many Chinese river clams, that is, when these river clams were named, the original specimen of Kuansui was produced in Nanjing.

4. Why are clam meat divided into red and white?

Clam meat is one of the eels' favorite foods.

There are two types of meat: red and white. White clam meat comes from clams in intensive fish ponds or clean waters; red or dark red clam meat comes from clams in unclean natural ditches and ponds. Because the water has never been disinfected and dewormed, its meat contains a large number of bacteria, viruses and insect eggs. A little observation will reveal that there are many yellow dots in the shape of ant eggs in the meat of red, dark red and black clams. Such clam meat must be boiled in boiling water before it can be fed to yellow eels. The method of boiling clam meat in boiling water is: first chop the red, dark red or black clam meat into small pieces, put it in a basin, only half of each basin, then quickly fill the basin with boiling water, stir it with chopsticks to make the boiling water heat uniform. After standing for 5 to 10 minutes, filter out the hot water (do not pour out the fishy water, because it is the best soup for mixing and feeding yellow eels), rinse it with cold water, and let the clam meat cool quickly. Such rapid heating and cooling kills all viruses, bacteria, parasites and eggs in the clam meat. When feeding it to eels, it not only eliminates pathogenic factors, but also helps the eels digestion and absorption.

This article is from: China Agricultural Press "Protecting Natural Resources"

5. This is a shell from the river bottom. The shell is very thick and the inner wall has a pearly luster. Does anyone know what kind it is?

This is a river clam, which has very strong vitality. There is a river to the east of our village. The photos were taken last year when they went down to the river and caught them.

Generally, river clams are most abundant in the mud of the river in June, July and August of summer.

I wish the author of this post all his wishes come true and his family is happy. Don't forget to accept my answer.

This is an ordinary river clam. A stripe on the shell of a river clam represents one year, which is called an annual ring. Some river clams can grow very large, up to 30 centimeters and weigh more than two kilograms. If the river flows to the sea, this kind of river clams will be particularly abundant.

Was it dug out from deep soil? It should be a sub-fossilized ancient river clam. If there was a river near our construction site, there would be a lot of this kind of clam a few meters underground.

River mussels

River clams usually grow in the mud at the bottom of the river.

Some clams contain natural pearls

Now it is also possible to carry out manual operation to produce freshwater pearls.

Where are the pictures? What's there to see without pictures?