Double-lined Mackerel
The double-lined mackerel (''Grammatorcynus bilineatus''), is a species of Spanish mackerel (tribe Scomberomorini) in the family Scombridae. This species is sometimes also called the scad mackerel. Distribution and habitat This species is present in the tropical and subtropical Indo-Pacific, from the Red Sea to the Andaman Sea, also from the northern coast of Australia to the Ryukyu Islands, as far as Fiji. Habitat These subtropical reef-associated and oceanodromous fishes usually inhabit open water but they are mostly found in shallow waters at depths of 15 to 50 m. Description ''Grammatorcynus bilineatus'' can reach a maximum length of about , with a common length of about and maximum weight of about . The double-lined mackerel has an elongated and slightly compressed body covered with small flakes with a relatively small mouth and large eyes. The body color is dark blue on the back, silvery on the sides, silvery white on the belly. The dorsal fins are two, separated by a ...
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Eduard Rüppell
Wilhelm Peter Eduard Simon Rüppell (20 November 1794 – 10 December 1884) was a German naturalist and explorer. Rüppell is occasionally transliterated to "Rueppell" for the English alphabet, due to german orthography. Biography Rüppell was born in Frankfurt am Main, the son of a prosperous banker, who was a partner in 'Rüppell und Harnier’s Bank'. He was originally destined to be a merchant, but after a visit to Sinai in 1817, where he met Henry Salt and the Swiss-German traveller Ludwig Burckhardt. He explored Giza and the Pyramids with Salt. In 1818, he developed an interest in natural history, and became elected member of the ''Senckenbergische Naturforschende Gesellschaf''. He attended lectures at the University of Pavia and University of Genoa in botany and zoology. Rüppell set off on his first expedition in 1821, accompanied by surgeon Micha