brine shrimp

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brine shrimp,

common name for a primitive crustaceancrustacean
, primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crustacean species are marine, but there are many freshwater forms. The few groups that inhabit terrestrial areas have not been particularly successful in an evolutionary sense; most require
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 that seldom reaches more than 1-2 in. (1.3 cm) in length and is commonly used for fish food in aquariums. Brine shrimp, which are not closely related to true shrimp, can be found almost everywhere in the world in inland saltwaters, although they are completely absent from oceans. They can live in water having several times the salinity of seawater, but they can also tolerate water having only one tenth the marine salt concentration. Brine shrimp usually occur in huge numbers and can be seen in vast windblown lines in the Great Salt Lake. Their absence from the sea has been explained by their vulnerability to attack by predators and the absence of the latter in their inland saline habitat. Although brine shrimp are considered to be members of a single genus, Artemis, and possibly a single species, there are several varieties. Generally, they have stalked, compound eyes and tapered bodies with a trunk that bears 11 pairs of leaflike legs. Females have a brood pouch from which active young are liberated under favorable conditions. Otherwise eggs are laid parthenogenetically (unfertilized by sperm) or fertilized and can either hatch immediately or be dried and remain viable for many years. These eggs are remarkably resistant to adverse environmental conditions, which is why they can be hatched so easily in saltwater and used for fish food; adult brine shrimp are also used as food in aquariums and are generally sold frozen. Brine shrimp are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, subphylum Crustacea, class Branchiopoda, order Anostraca.
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References in periodicals archive ?
In an attempt to establish the live food requirements and to optimize rotifers and Artemia production during the larval culture of the spotted sand bass larvae, the feeding efficiency in terms of the feeding incidence (percentage of larvae with prey) and the feeding intensity (number of prey in the digestive tract) was evaluated during larval rearing.
"The artemia genebank established in West Azerbaijan Province has become the second largest one in the world.
According to the criteria adopted by Dolabela (1997), the evaluation of the toxicity of the essential oil in the tested concentrations against the microcrack Artemia salina, showed in the period of exposure of 24 hours, highly toxic toxicity, that is, [LC.sub.50] (mg x [L.sup.-1]) equal to 14, 13 mg x [L.sup.-1], with a confidence interval of 95% for the oil extracted from the Pimenta dioica.
During the observation, newly hatched Artemia larvae were fed to polyps two times per week.
Dried eggs (0.5 g) of shrimp, Artemia salina, were cultured in 400 mL of artificial seawater and aerated for 24 to 48 h at room temperature.
Duty on artemia, a kind of shrimp, has been hiked to 15 per cent.
En el presente estudio, el suministro de Artemia salina durante las primeras semanas (Tabla I) pudo haber facilitado la digestion de la dieta de transicion suministrada, lo cual se manifesto en la mayor ganancia de talla, peso corporal y sobrevivencia, tal como lo reporto Borges et al., (2006) para Piaractus mesopotamicus, especie en la cual encontraron que al utilizar conjuntamente organismos vivos y dieta inerte se obtienen mejores resultados en cuanto a parametros productivos que cuando solo se utilizaron organismos vivos, ya que el alimento vivo por si solo no es suficiente para suplir los requerimientos nutricionales de las postlarvas de peces (Dabrowski, 1984).
In the brine shrimp Artemia, a conspicuous inhabitant of hypersaline lakes and lagoons, the chromocenter number may have a diagnostic value as an indicator of species or populations (Badaracco et al., 1987; Abreu-Grobois and Beardmore, 1989; Colihueque and Gajardo, 1996; Papeschi et al., 2000; Gajardo et al., 2001; Torrentera and Abreu-Grobois, 2002; Papeschi et al., 2008).