Moina (Latin: Moina) is a genus of lower bivalve planktonic crustaceans from the order superorder. Externally, the shape of the body has the outlines of two roundnesses - the head and body. The entire surface of the body is covered with bristles. Sexual dimorphism is very pronounced - females are larger than males and reach 1.35 mm, and those do not exceed 0.6 mm. Moreover, males have relatively long first antennas.
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| Moina Baird, 1850 | ||||||||||||
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Systematics obsolete Valid data see itis and ncbi |
Content
Genus Biology
At a temperature of 20 ° C, about five days mature. The life span of a crustacean is two to three weeks, rarely up to two months, during which time it repeatedly gives new generations , numbering up to 30 embryos, with an interval of two to three days. Males and eppippiums appear under adverse conditions (feed reduction, temperature drop, overpopulation, etc.) usually before the puddles dry out (main habitats) or in the fall with cooling.
Range
Mines are common in all zoogeographic areas. Found in many bodies of water: from lakes to puddles. The greatest number of individuals is reached in ponds that are polluted with organic substances. For this group of animals tolerance to a certain concentration of toxic substances is characteristic, due to which mines are actively developing in urban wastewater treatment plants.
Aquaculture
Mines have a number of useful biological properties, which makes them in demand in aquaculture . For fish species with large newborn fry, these crustaceans are the “starting” food , and for small fish they can be the main food for rearing after the “start” on infusoria and nauplii (ie, from about 1-2 weeks to 3-4 months. The most important feature of moins is that they are among the fastest-growing crustaceans, their life cycle is short, and they can exist at relatively high densities. Thus, when creating optimal temperature-feed conditions, one can achieve a “flash” of culture up to 100-fold growth b omassy for 5 days. After reaching a peak population of Culture Moin requires "Recharge", otherwise the fast (1-2 days) fades away, sometimes to the point of extinction.
Species and subspecies
- Moina affinis Birge, 1893
- Moina australiensis sars , 1896
- Moina belli Gurney, 1904
- Moina brachiata (Jurine, 1820)
- Moina brachycephala Goulden, 1968
- Moina flexuosa Sars, 1897
- Moina hartwigi Welter, 1898
- Moina hutchinsoni Brehm, 1937
- Moina macrocopa (Straus, 1820)
- Moina macrocopa americana goulden , 1968
- Moina macrocopa macrocopa (Straus, 1820)
- Moina micrura Kurz, 1874
- Moina minuta Hansen, 1899
- Moina mongolica daday , 1901
- Moina rectirostris (Leydig, 1860)
- Moina reticulata (Daday, 1905)
- Moina salina Daday, 1888
- Moina tenuicornis Sars, 1896
- Moina weismanni Ishikawa, 1897
- Moina wierzejskii Richard, 1895
Note
Due to the fact that this taxonomic group is constantly being reviewed, the systematics in the body card are presented according to domestic sources (Key to freshwater invertebrates of Russia and adjacent territories. Volume 2. Crustaceans. Volume editor V. R. Alekseev. - St. Petersburg: 1995 - p. 627). The most up-to-date data on taxonomy is presented in the ITIS and NCBI sections at the corresponding digital links.
Links
- HERALD HYDROBIOLOGY - The scientific works of A. I. Naberezhny