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,
Indian black turtle Indian black turtle The Indian black turtle ("Melanochelys trijuga") or Indian pond terrapin is a species of medium-sized freshwater turtle found in South Asia. Despite its name, the color of its upper shell or carapace can vary from reddish to dark brown and black with yellow streaks running along its length. The underside or plastron is uniformly brown in color. The face of this turtle may have yellow or orange marks and spots, with color varying between subspecies. The size of the species may vary from 38 to 45 cm. The species occurs in India, Bangladesh, Myanmar, Sri Lanka, the