CATDOLL : CATDOLL: How big can river clams grow in a year?

1. How big can river clams grow in a year?

River clams can grow 1-2 kilograms a year. They are molluscs belonging to the family Ophiopodia and mainly live in freshwater lakes. The food of river clams is mainly rotifers, green-eye worms, dinoflagellates, and tetrahedralis. They have weak mobility and crawl slowly. River clams are dioecious and reproduce in the summer every year.

How big can river clams grow in a year? River clams can grow 1-2 kilograms a year. It is a general term for mollusks in the family Clamidae. The shape of their shells varies, and the two shells of river clams are equal. The top of the shell usually has concentric circles or broken lines. The outside of the river clams has ligaments, which are elastic and can allow the two shells of the river clams to open.

Morphological characteristics of river clams: The internal structure of river clams is mainly divided into mantle, axe feet, muscles, digestive system, respiratory organs, excretory organs, circulatory system, etc. Among them, the mantle is tightly attached to the outside of the two shells of the river clam, the axe feet are axe-shaped, which are the clam's movement organ, and the respiratory organs are the gills on both sides of the river clam.

The living habits of river clams: The food of river clams is mainly protozoa, organic debris or unicellular algae. When breeding river clams, you can provide them with animal feed such as rotifers, flagellates, and green-eyed worms, and you should also provide them with foods such as quadrangular algae, rod-shaped algae, boat-shaped algae, and green algae to meet their growth needs.

The reproduction method of river clams is that river clams are dioecious. Their gonads are located around the dorsal intestine of the foot and are grape-shaped glands. The growing season of river clams is from June to July every summer. The fertilized eggs will develop in the mother's body. The larvae of river clams have well-developed adductor muscles and can swim with the help of the opening and closing of their bivalve.

2. How do clams reproduce?

During the breeding season of clams, the mature eggs of female clams are discharged into the mantle cavity through the genital opening; the mature sperm of male clams are discharged from the vas deferens through the genital opening to the suprabranchial cavity, and then discharged into the water body outside the body through the water outlet pipe. The sperm enters the mantle cavity of the female clams with the water and combines with the eggs to be fertilized to complete fertilization. The fertilized eggs develop embryos on the left and right external gill lobes of the female clams.

Since you raised the question about food,,,

The clam meat is the meat inside the clam shell.

3. How do river clams mate and grow and develop?

River mussels: Sexual maturity begins in May every year. When most of the eggs in the reproductive nest are mature, the female mussels ovulate and fertilize. From the cleavage of the fertilized egg, it goes through the embryonic development process of fertilized egg → mulberry stage → blastocyst stage → gastrula stage → glochid larvae to form glochid larvae. After the glochid larvae mature on the external gill flaps of the mother mussel, they have foot threads and hooks, and can and must parasitize on fish bodies to complete the metamorphosis process and become young mussels.

4. How do clams reproduce naturally?

Hello, editor! Mussels and clams are both invertebrates belonging to the phylum Mollusca and the class Bivalvia. They do not have to rely on artificial reproduction to survive! Mussels and clams are both oviparous animals. The reproduction method is to reproduce the next generation through in vitro fertilization! In other words, mussels expel eggs and sperm from the body, combine and fertilize, and then grow into very small and transparent clams. The newly hatched small clams do not have a shell yet. They are very small and will drift with the current until their fleshy viscera are covered with a magical outer coat, the mantle, which will secrete a kind of carbonic acid, and then slowly wrap the visceral mass inside, which is the shell. At this time, the small clams no longer drift with the current, they will find a suitable environment at the bottom of the water to live and grow up.

5. What color is the blood of river clams? Are they divided into male and female? How do they reproduce?

The blood of river clams contains hemocyanin, which turns blue when oxidized and colorless when reduced.

Mussels are dioecious, with gonads located around the intestine on the dorsal side of the foot, grape-shaped glands, milky white testes, and pale yellow ovaries. The reproductive ducts are continuous, and the gonadal opening is very small, located at the rear and lower part of the renal opening.

The reproductive season of clams is generally in summer, and the sperm and eggs are fertilized in the gill cavity of the external gills. Due to the maternal adhesion, the fertilized eggs will not be washed out by the water flow, but will remain in the gill cavity for development. Therefore, the gill cavity of the external gills is also called the brood pouch. After completely unequal cleavage (spiral type), it develops into a blastocyst, forms a gastrula by exocarpation and invagination, develops into a larva, and hibernates in the gill cavity. Observation of the early embryonic cells of the dorsal horn toothless clam determined that its chromosomes 2n=38 or 2n=37 (chromosome No. 19 is single), the difference between the two is unclear, and may be related to sex chromosomes (Ma Qingfu et al. 1987). In the spring of the following year, the larvae hatched and developed into the glochid larvae unique to river clams (equivalent to the disc larvae of other bivalve species). The larvae are bivalve. There are well-developed adductor muscles, and each ventral edge of the shell has a strong hook with teeth. There is a sticky filament in the center of the abdomen, called the foot thread. The side edge of the shell has bristles, which have a sensory function. The larvae have a mouth but no anus. The larvae can swim by opening and closing the bivalve. Freshwater crabs and other fish insert their long ovipositors into the water inlet of the mussel and lay eggs in the mantle cavity of the mussel. In this way, the larvae of the mussel have the opportunity to contact the fish and can parasitize the gills and fins of the fish. The fish skin is stimulated by it and proliferates abnormally, wrapping the larvae in it and forming a sac. The larvae absorb nutrients from the fish with the mantle epithelium. After 2 to 5 weeks, they metamorphose into young mussels, break the sac and leave the fish body, and sink to the bottom of the water to live. They reach sexual maturity after 5 years. They continue to grow afterwards.