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This table shows the number of heavy metal criteria met by each metal, out of the ten criteria listed in this section i.e. two based on density, three on atomic weight, two on atomic number, and three on chemical behaviour. [n 1] It illustrates the lack of agreement surrounding the concept, with the possible exception of mercury, lead and bismuth.
Algae eater or algivore is a common name for any bottom-dwelling or filter-feeding aquatic animal species that specialize in feeding on algae and phytoplanktons.Algae eaters are important for the fishkeeping hobby and many are commonly kept by aquarium hobbyists to improve water quality. [1]
A claw sinker consists of a sinker weight which is typically of round shape, and a number of metal wire spikes grouped around the sinker weight acting as barbs. Claw sinkers are used in surf fishing on sandy bottoms with strong currents, mainly to prevent the sinker from getting carried off with the current. Upon casting a claw sinker, the line ...
Lucky iron fish are fish-shaped cast iron ingots used to provide dietary supplementation of iron to individuals affected by iron-deficiency anemia. The ingots are placed in a pot of boiling water to leach elemental iron into the water and food.
The standard for fish for human consumption is less than 1 mg/kg, but many tested samples were more than five times that amount. [134] Chromium, especially hexavalent chromium, is highly toxic to fish because it is easily absorbed across the gills, readily enters blood circulation, crosses cell membranes and bioconcentrates up the food chain.
Doctor fish cleaning a bather's feet Some spas provide large fish ponds with thousands of doctor fish in them. Doctor fish facilities at spa resorts exist in many countries worldwide. In 2006, doctor fish spa resorts opened in Kangal, Turkey, Hakone, Japan, and Umag, Croatia, where the fish are used to clean the bathers at the spa.
The false cleanerfish (Aspidontus taeniatus) is a species of combtooth blenny, a mimic that copies both the dance and appearance of Labroides dimidiatus (the bluestreak cleaner wrasse), a similarly colored species of cleaner wrasse.
The astrological symbol for the planet became one of the alchemical symbols for the metal, and Mercury became an alternative name for the metal. Mercury is the only metal for which the alchemical planetary name survives, as it was decided it was preferable to quicksilver as a chemical name. [27] [28]
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