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Craspedacusta sowerbii
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Craspedacusta sowerbii
Craspedacusta sowerbii, the peach blossom jellyfish or freshwater jellyfish, is a species of freshwater hydrozoan jellyfish, or hydromedusa cnidarian. Hydromedusan jellyfish differ from scyphozoan jellyfish because they have a muscular, shelf-like structure called a velum on the ventral surface, attached to the bell margin. Originally from the Yangtze basin in China, C. sowerbii is an introduced species now found throughout the world in bodies of fresh water.
C. sowerbii medusae are about 20–25 mm (approximately 1 in.) in diameter, somewhat flatter than a hemisphere, and very delicate, when fully grown. They have a whorl of up to 400 tentacles tightly packed around the bell margin. Hanging down from the center of the inside of the bell is a large stomach structure called a manubrium, with a mouth-opening with four frilly lips. Circulation of nutrients is facilitated by four radial canals which originate at the edges of the stomach (manubrium), and which are also connected to a ring canal, located near the bell margin. Most of the body is transparent or translucent, with a whitish or greenish tinge. The (usually) four large flat sex organs (gonads) are attached to the four radial canals, and are usually opaque white. The many tentacles each contain thousands of cells called cnidocytes, which contain nematocysts (also known as cnidocysts), and are used to capture prey and pass it to the mouth. Food is taken in the mouth opening, and waste is finally expelled out of the same opening.
C. sowerbii is native to the Yangtze basin in China, but has been introduced on every continent except for Antarctica.
It is usually found in calm, freshwater reservoirs, lakes, impoundments, gravel pits or quarries. It has also been seen in slow-moving backwaters of river systems such as the Allegheny River, the Ohio River and the Tennessee River in the United States and the Wang Thong River of Thailand. It is not generally seen in fast flowing streams or rivers.
The medusa's appearance is sporadic and unpredictable from year to year. It is not uncommon for C. sowerbii to appear in a body of water where it had never been documented before, in very large numbers, and its appearance may even be reported on the local news.
Since 2008 the freshwater jellyfish have been sighted every September and October in the Zhaojiaya Reservoir near Zhangjiajie, Hunan, China.
It has been found in the Cauvery River and backwaters of the Hemavathi River in Karnataka, India.
It is also found in the Bang Rachan rapids forest on the Khek River, the upstream of the Wang Thong River in Khao Kho District, Phetchabun Province, where it is the provincial aquatic life. Freshwater jellyfish can only be seen around early March to May, which is the summer.
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Craspedacusta sowerbii
Craspedacusta sowerbii, the peach blossom jellyfish or freshwater jellyfish, is a species of freshwater hydrozoan jellyfish, or hydromedusa cnidarian. Hydromedusan jellyfish differ from scyphozoan jellyfish because they have a muscular, shelf-like structure called a velum on the ventral surface, attached to the bell margin. Originally from the Yangtze basin in China, C. sowerbii is an introduced species now found throughout the world in bodies of fresh water.
C. sowerbii medusae are about 20–25 mm (approximately 1 in.) in diameter, somewhat flatter than a hemisphere, and very delicate, when fully grown. They have a whorl of up to 400 tentacles tightly packed around the bell margin. Hanging down from the center of the inside of the bell is a large stomach structure called a manubrium, with a mouth-opening with four frilly lips. Circulation of nutrients is facilitated by four radial canals which originate at the edges of the stomach (manubrium), and which are also connected to a ring canal, located near the bell margin. Most of the body is transparent or translucent, with a whitish or greenish tinge. The (usually) four large flat sex organs (gonads) are attached to the four radial canals, and are usually opaque white. The many tentacles each contain thousands of cells called cnidocytes, which contain nematocysts (also known as cnidocysts), and are used to capture prey and pass it to the mouth. Food is taken in the mouth opening, and waste is finally expelled out of the same opening.
C. sowerbii is native to the Yangtze basin in China, but has been introduced on every continent except for Antarctica.
It is usually found in calm, freshwater reservoirs, lakes, impoundments, gravel pits or quarries. It has also been seen in slow-moving backwaters of river systems such as the Allegheny River, the Ohio River and the Tennessee River in the United States and the Wang Thong River of Thailand. It is not generally seen in fast flowing streams or rivers.
The medusa's appearance is sporadic and unpredictable from year to year. It is not uncommon for C. sowerbii to appear in a body of water where it had never been documented before, in very large numbers, and its appearance may even be reported on the local news.
Since 2008 the freshwater jellyfish have been sighted every September and October in the Zhaojiaya Reservoir near Zhangjiajie, Hunan, China.
It has been found in the Cauvery River and backwaters of the Hemavathi River in Karnataka, India.
It is also found in the Bang Rachan rapids forest on the Khek River, the upstream of the Wang Thong River in Khao Kho District, Phetchabun Province, where it is the provincial aquatic life. Freshwater jellyfish can only be seen around early March to May, which is the summer.
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