Age determination in fish fish. Johannes Reibisch, working for the Commission of Scientific Investigation of German Seas at Kiel, attempted to use Hoffbauer’s techniques to age plaice ("Plueronectes platessa") but found it difficult to accurately discern annuli. He decided to study a different structure and in 1899 he published the first procedures using otoliths as an aging structure. A fellow scientist also with the German Commission at Kiel, Friedriche Heincke, also frustrated with difficult scale annuli, further studied other structures to age fish. He discovered annuli in the vertebrae, opercula, and pectoral girdle and published his findings in Heicke 1905. The works of Hoffbauer,
Sole (fish) Sole (fish) Sole is a fish belonging to several families. Generally speaking, they are members of the family Soleidae, but, outside Europe, the name "sole" is also applied to various other similar flatfish, especially other members of the sole suborder Soleoidei as well as members of the flounder family. In European cookery, there are several species which may be considered "true soles", but the common or Dover sole "Solea solea", often simply called "the sole", is the most esteemed and most widely available. The word "sole" in English, سول پیس in Urdu, French and Italian comes from its resemblance to