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- This article gives some brief explanation about type of freshwater rotifers.
- Rotifers have been divided into four categories which relate to their appearance and habitat preferences rather than to their taxonomic classification.
- Bdelloid Rotifers - Common in ponds and on mosses, are soft-bodied, and have leech-like movements.
- Loricate Rotifers - Those having a characteristic hardened or semi-hardened body shell.
- Planktonic Rotifers - Normally found in the open surface waters of a pond or stream.
- Sessile Rotifers - Found attatched to submerged plants and rootlets in ponds and streams.
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- Rotifers are small (100-300 micron) zooplankton that exist in freshwater, brackish, and marine environments.
- Rotifers feed on microalgae and are consumed by a wide variety of fish, shellfish, corals, and other filter feeding organism.
- Rotifers are used extensively in aquaculture and aquariums because of their super high reproductive rates (doubling or better every 24 hours).
- Under optimal conditions a rotifer culture will double in volume every day.
- The life span of a marine rotifer is 7 to 12 days.
- They have very high metabolisms and empty their guts and need to eat every 4 hours.
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- This article proves that rotifers are very easy to culture at home.
- Rotifers feed best on microalgae, typically in the 1 to 10 micron range.
- The most commonly used algae is called Nannochloropsis.
- Other commonly used algae are Isochrysis and Pavlova.
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- Nauplii of the brine shrimp artemia constitute the most widely used food item.
- Over 2000 metric tons of dry artemia cysts are marketed worldwide for on-site hatching into 0.4 mm nauplii.
- Those cysts are available year-round in large quantities along the shorelines of hypersaline lakes, coastal lagoons and solar saltworks scattered over the five continents.
- After harvesting and processing, cysts are made available in cans as storable ‘on demand’ live feed.
- Upon some 24-h incubation in seawater, these cysts release free-swimming nauplii that can directly be fed as a nutritious live food source to the larvae of a variety of marine as well as freshwater organisms.
- Its use as a food for the culture of larval organisms began in the 1930’s.
- During the 1940’s, most commercially available brine shrimp cysts represented collections from natural saline lakes and coastal saltworks.
- Early pioneers exploited in 1951 the cyst production of Artemia at the Great Salt Lake in Utah, USA.


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