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Recirculating aquaculture system. Recirculating aquaculture systems ( RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a ...
Washboard (musical instrument) Washboard player accompanying piano. The washboard and frottoir (from Cajun French "frotter", to rub) are used as a percussion instrument, employing the ribbed metal surface of the cleaning device as a rhythm instrument. As traditionally used in jazz, zydeco, skiffle, jug band, and old-time music, the washboard ...
Fish farming or pisciculture involves commercial breeding of fish, most often for food, in fish tanks or artificial enclosures such as fish ponds. It is a particular type of aquaculture, which is the controlled cultivation and harvesting of aquatic animals such as fish, crustaceans, molluscs and so on, in natural or pseudo-natural environments.
dnr.wi.gov. The Wisconsin Department of Natural Resources ( WDNR) is a government agency of the U.S. state of Wisconsin charged with conserving and managing Wisconsin's natural resources. [3] The Wisconsin Natural Resources Board has the authority to set policy for the WDNR. The WDNR is led by the Secretary, who is appointed by the Governor of ...
Elacatinus evelynae. Elacatinus evelynae is a very small, torpedo -shaped fish. It can reach a maximum length of 4 cm (1.6 in). It has a yellow stripe in front of each eye that joins to form a V near the tip of its snout. Black stripes run under the yellow ones from the snout, over the lower part of the eye to the end of the caudal fin. [2]
Scratchboard. Scratchboard or scraperboard is a form of direct engraving where the artist scratches off dark ink to reveal a white or colored layer beneath. The technique uses sharp knives and tools for engraving into the scratchboard, which is usually cardboard covered in a thin layer of white China clay coated with black India ink.
Fish meal, sometimes spelt fishmeal, is a commercial product made from whole wild-caught fish, bycatch, and fish by-products to feed farm animals, e.g., pigs, poultry, and farmed fish. [1] Because it is calorically dense and cheap to produce, fishmeal has played a critical role in the growth of factory farms and the number of farm animals it is ...
Fulling, also known as tucking or walking ( Scots: waukin, hence often spelled waulking in Scottish English ), is a step in woollen clothmaking which involves the cleansing of woven cloth (particularly wool) to eliminate ( lanolin) oils, dirt, and other impurities, and to make it shrink by friction and pressure.