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,
Vietnamese leopard gecko Vietnamese leopard gecko The Vietnamese leopard gecko or Chinese tiger gecko ("Goniurosaurus araneus") is a species of lizards in the family Eublepharidae. It is endemic to the Cao Bằng Province of Vietnam. The scientific species name, is from the Latin, "aranea", which means "spider", due to the spindly, spider-like form of this species. The Vietnamese Tiger gecko is dark gray in color and has lots of black spots and four wide orange bands across the back. Its eyes are dark reddish brown. "Goniurosaurus araneus" is distinguished from other species of the same genus by its elongated dorsal scales. This gecko