Bitterlings | |
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Rosy bitterling (R. ocellatus) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Cypriniformes |
Family: | Cyprinidae |
Subfamily: | Acheilognathinae |
Genus: | Rhodeus Agassiz, 1832 |
Type species | |
Cyprinus amarus Bloch, 1782 | |
Synonyms | |
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Rhodeus is a genus of cyprinid fish, consisting of 23 species called bitterlings. The scientific name is derived from the Greek word rhodeos, meaning "rose". Most species in the genus are restricted to Asia, but two species are found in Europe (R. amarus and R. meridionalis).
Bitterlings are short-lived species, generally surviving only about five years. Their maximum size is 11 cm, but they are usually much shorter. Bitterlings inhabit slow-flowing or still waters, such as ponds, lakes, marshes, muddy and sandy pools, and river backwaters. Because they depend on freshwater mussels to reproduce, their range is restricted. Bitterlings are omnivorous, feeding on both invertebrates and plants.
Bitterlings have a remarkable reproduction strategy where parents transfer responsibility for the care of their young to various species of freshwater mussels (Unionidae and Margaritiferidae). The female extends her long ovipositor into the mantle cavity of the mussel and deposits her eggs between the gill filaments. The male then ejects his sperm into the mussel's inhalent water current and fertilization takes place within the gills of the host. The same female may use a number of mussels, and she deposits only one or two yellow, oval eggs into each. Early developmental stages are protected from predation within the body of the mussel. After 3 to 4 weeks, larvae swim away from the hosts to continue life on their own.
In 1936, the bitterling was thought to respond to hormones in a pregnant woman's urine, but the work was later discredited. [1] [2]
This genus and Acheilognathus have a convoluted taxonomic history, one being at times included in the other. They are now considered separate, but some species formerly in Rhodeus are now in Acheilognathus.
There are currently 23 recognized species in this genus:
Cyprinidae is a family of freshwater fish commonly called the carp or minnow family, including the carps, the true minnows, and their relatives the barbs and barbels, among others. Cyprinidae is the largest and most diverse fish family, and the largest vertebrate animal family overall, with about 3,000 species; only 1,270 of these remain extant, divided into about 200 valid genera. Cyprinids range from about 12 mm (0.5 in) in size to the 3 m (9.8 ft) giant barb. By genus and species count, the family makes up more than two-thirds of the ostariophysian order Cypriniformes. The family name is derived from the Greek word kyprînos.
The Amur bitterling is a small fish of the carp family. It is sometimes just called "bitterling", which dates back to the time when the European bitterling was still considered conspecific with R. sericeus, and "bitterling" properly refers to any species in entire genus Rhodeus. The Amur bitterling is found in Siberia, while the European bitterling is found from European Russia westwards.
The rosy bitterling or Tairiku baratanago is a small freshwater fish belonging to the family Cyprinidae (carp), native to East Asia from the Amur River basin to the Pearl River basin.
Schizothorax is a genus of cyprinid fish found in southern and western China, through northern South Asia (Himalaya) and Central Asia, to Iran, with a single species, S. prophylax, in Turkey. They are primarily found in highland rivers, streams and lakes, although a few species occur in lower-lying locations, like Lake Balkhash and lakes of the Sistan Basin. Their scientific name means "cloven-breast", from Ancient Greek schízeïn (σχίζειν) 'to cleave' and thórax (θώραξ) 'breast-plate'. The western species are typically referred to as marinkas from their Russian name marinka (маринка), while the eastern species are usually called snowtrout. Although they do resemble trouts in habitus this is merely due to convergent evolution and they are by no means closely related apart from both being Teleostei: Cyprinids are in the teleost superorder Ostariophysi, while trouts are in the superorder Protacanthopterygii. Their ancestors must thus have diverged as early as the Triassic, more than 200 million years ago.
Sinocyclocheilus is a genus of freshwater fish in the family Cyprinidae that is endemic to Guangxi, Guizhou and Yunnan in China. Almost all of its species live in or around caves and most of these have adaptions typical of cavefish such as a lack of scales, lack of pigmentation and reduced eyes. Several species have an unusual hunchbacked appearance and some of the cave-dwellers have a "horn" on the back, the function of which is unclear. In contrast, the Sinocyclocheilus species that live aboveground, as well as a few found underground, show no clear cavefish adaptions. They are relatively small fish reaching up to 23 cm (9.1 in) in length. The individual species have small ranges and populations, leading to the status of most of the evaluated species as threatened. Many species populations in the genus have yet to be evaluated by the IUCN.
The Kyushu bitterling is a temperate freshwater fish belonging to the Acheilognathinae of the family Cyprinidae. It originates on Kyushu Island in Japan. It was originally described as Acanthorhodeus atremius by Jordan & Thompson in 1914. The fish reaches a size of up to 6 cm (2.5 in), and is native to freshwater habitats with a pH of 6.8 to 7.8, a hardness of 20 DH, and a temperature of 10 to 25 °C.
The European bitterling is a temperate freshwater fish belonging to the subfamily Acheilognathinae of the family Cyprinidae. It originates in Europe, ranging from the Rhone River basin in France to the Neva River in Russia. It was originally described as Cyprinus amarus by Marcus Elieser Bloch in 1782, and has been referred to in scientific literature as Rhodeus sericeus amarus. It is known simply as "the bitterling" in its native range, where it is the only species of its genus Rhodeus, and sometimes in the scientific literature, also, but this is technically wrong, being a leftover from the times when the European bitterling was united with its Siberian relative, the Amur bitterling, in R. sericeus. Properly, "bitterling" can refer to any species of Acheilognathus or Rhodeus.
Light's bitterling is a temperate freshwater fish belonging to the subfamily Acheilognathinae of the family Cyprinidae. It originates in Russia and China, from the Amur River basin to southern China. It was originally described as Pseudoperilampus lighti by H.W. Wu in 1931.
Rhodeus smithii, sometimes known as the Japanese rosy bitterling, Japanese bitterling, or Nippon baratanago is a temperate freshwater fish belonging to the Acheilognathinae subfamily of the family Cyprinidae. It originates in stagnant waters in inland rivers in Japan. It was originally described as Achilognathus smithii by Charles Tate Regan in 1908, and is also referred to as Rhodeus ocellatus smithii in scientific literature.
Acheilognathus is a genus of cyprinid fish native to Asia. The name is derived from the Greek a, meaning "without", the Greek cheilos, meaning "lip", and the Greek gnathos, meaning "jaw".
The bitterling-like cyprinids form the cyprinid subfamily Acheilognathinae. This subfamily contains seven genera, although the Khanka spiny bitterling is often placed in Acheilognathus, and at least 75 described species to date. Over half of the species are in the genus Acheilognathus.
Broda Otto Barnes was an American physician and professor of medicine who studied endocrine dysfunction, particularly hypothyroidism. In the 1970s, Barnes published several books arguing that hypothyroidism was underdiagnosed in the U.S. and was responsible for a wide range of health problems. Barnes' views on the prevalence of hypothyroidism were never widely accepted by the medical community and run counter to its current understanding of thyroid function, but they have been embraced by some elements of the alternative medicine community.
The striped bitterling is a species of freshwater ray-finned fish in the genus Acheilognathus. It is endemic to Lake Biwa and Lake Yogo in Japan. It typically grows to a length of 6.0 cm.
Acheilognathus macromandibularis is a species of freshwater ray-finned fish in the genus Acheilognathus. It is endemic to China. It grows to a maximum length of 5.2 cm (2.0 in).
Acheilognathus macropterus is a species of cyprinid fish native to China and northern Vietnam. It grows to a length of 27.5 centimetres (10.8 in) SL.
The Tokyo bitterling is a temperate freshwater fish of the carp family (Cyprinidae). Taxonomically, it belongs to the subfamily Acheilognathinae.
Rhodeus albomarginatus is a species of freshwater ray-finned fish in the genus Rhodeus. It is endemic to China, where it is found in the Lvjiang River of the Yangtze River drainage and uses the freshwater mussel Ptychorhynchus murinum as its host for spawning.
Sinorhodeus microlepis is a bitterling native to the Yangtze river in Chongqing City, China, and it is the only member of the genus Sinorhodeus. This species breeds in the Asian clam, which is different from all other bitterling-like cyprinids.
Rhodeus nigrodorsalis is a species in the Cyprinidae family. The species is only known in China. The fish spawns primarily during January to March.
Not quite two years ago physicians and prospective parents welcomed the news that a small, carp-like fish could tell whether or not a woman was going to have a baby ... The bitterling lost her standing and the doe rabbit and mouse were reinstated as nature's best indicators of human pregnancy. But obstetricians Kanter and Klawans pursued the matter with another research mate, physiologist Broda Otto Barnes, and secured further results which they detailed in Science last week.