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,
Bend-Or spots Unrelated patterns may be confused with Bend-Or spots. Some roan horses have patches of darker hairs called "corn marks" or "corn spots." While these resemble Bend-Or spots, they are linked to solid-colored hair growing in over minor cuts or scratches to the skin, and thus the underlying genetic cause appears to be unrelated. Another pattern seen primarily in some gray horses is dappling, the presence of darker hairs in round shapes against a lighter hair coat. However, dapples are an intermediate stage of the graying process, and will only last a few years. These markings were named after the Thoroughbred