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Symphysodon discus discus
 

Symphysodon discus discus

The Heckel discus has only three dark transverse bands. Unlike its cousins - the subspecies and varieties of S. aequifasciatus, which are mainly raised in captivity - the Heckel discus is usually procured from the wild. Tens of thousands of fish of these species are exported every year; there is little data concerning the nfluence of these culls on the natural population, but these Cichlids do not appear to be endangered. As a matter of nterest, the Heckel forms a modest food resource, on a very localized basis, for certain native populations. Size: 10-15 cm.

Symphysodon discus discus

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НИШИДЖИМА (Нисидзима) (Nishijima) Кацухико (р . 1926), японский физик, иностранный член РАН (1991; иностранный член АН СССР с 1982). Труды по квантовой теории поля и физике элементарных частиц. Ввел (1953, независимо от М. Гелл-Мана) понятие странности и открыл закон ее сохранения. Предсказал (1957) существование двух видов нейтрино.