Black carp
Encyclopedia
The black carp is a species of cyprinid
Cyprinid
The family Cyprinidae, from the Ancient Greek kyprînos , consists of the carps, the true minnows, and their relatives . Commonly called the carp family or the minnow family, its members are also known as cyprinids...

 fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

 indigenous to China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, and widely cultivated for food and Chinese medicine. It is the sole species of the genus Mylopharyngodon. The black carp grows to a length of up to three feet (1 m), and over 70 pounds (32 kg), generally feeding on snail
Snail
Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s and mussel
Mussel
The common name mussel is used for members of several families of clams or bivalvia mollusca, from saltwater and freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which are often more or less rounded or oval.The...

s. Black carp, together with bighead, silver, and grass carps, make up the culturally important "four famous domestic fishes"
Asian carp
Many species of heavy-bodied cyprinid fish are collectively known in the United States as Asian carp. Cyprinids from the subcontinent [for example, catla and mrigal ] are not included in this classification, and are known collectively as "Indian carp".Eight Asian carp have been substantially...

 used in polyculture in China for over a thousand years, and known as "Asian carp
Asian carp
Many species of heavy-bodied cyprinid fish are collectively known in the United States as Asian carp. Cyprinids from the subcontinent [for example, catla and mrigal ] are not included in this classification, and are known collectively as "Indian carp".Eight Asian carp have been substantially...

" in the United States. Black carp are not as widely distributed worldwide as the other three.

In China, black carp are the most highly esteemed and expensive foodfish among the four domestic fishes, and partly because of its diet and limited food supply, is the most scarce and expensive in the marketplace.

Black carp in the United States

The nature of the black carp's diet has led to its use in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 in the control of snails in aquaculture
Aquaculture
Aquaculture, also known as aquafarming, is the farming of aquatic organisms such as fish, crustaceans, molluscs and aquatic plants. Aquaculture involves cultivating freshwater and saltwater populations under controlled conditions, and can be contrasted with commercial fishing, which is the...

. Snails are obligate alternate hosts of trematode pests that can cause substantial losses to aquaculture crops. Some state aquaculture
Aquaculture
Aquaculture, also known as aquafarming, is the farming of aquatic organisms such as fish, crustaceans, molluscs and aquatic plants. Aquaculture involves cultivating freshwater and saltwater populations under controlled conditions, and can be contrasted with commercial fishing, which is the...

 laws require the carp to be bred as triploids
Polyploidy
Polyploid is a term used to describe cells and organisms containing more than two paired sets of chromosomes. Most eukaryotic species are diploid, meaning they have two sets of chromosomes — one set inherited from each parent. However polyploidy is found in some organisms and is especially common...

, to render them sterile
Infertility
Infertility primarily refers to the biological inability of a person to contribute to conception. Infertility may also refer to the state of a woman who is unable to carry a pregnancy to full term...

, and thus minimize the potential for the fish to escape and create self-sustaining populations. However, the use of triploids does require the maintenance and use of fertile diploid brood stock at least at some location, for production of the triploids.

No state allows the intentional release of black carp, sterile or otherwise. However, the United States Geological Survey
United States Geological Survey
The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 reported seven confirmed black carp were caught in the Mississippi River
Mississippi River
The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

 basin. Rivers where black carp have been captured also include the White in Arkansas, the Atchafalaya and Red in Louisiana, and the Osage in Missouri. Some of the captured fish have been confirmed to be diploid and assumed fertile; one has been confirmed to be a triploid and assumed sterile. In Louisiana, many other reports by knowledgeable fishers of their capture have not been verified by biologists.

Black carp are considered to be a serious threat to mollusks native to the United States, many of which are critically endangered. In 2007, the black carp was listed as an "injurious species" under the Lacey Act. It is thus illegal in most cases to transport live black carp, whether sterile or fertile, into the United States or across state lines. In states where legal, black carp can still be possessed.

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