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,
RV Platessa RV Platessa RV "Platessa" (LT205) was a fisheries research vessel that was operated by the Ministry of Agriculture, Fisheries and Food (United Kingdom) - Directorate of Fisheries, now known as the Centre for Environment, Fisheries and Aquaculture Science (Cefas) between 1946 and 1967. RV "Platessa" was based at the port of Lowestoft and was originally ordered by the Admiralty as one of 81 Motor Fishing Vessels (MFVs) in the ‘1501-Class’ during World War II. Motor fishing vessels were small wooden craft, built in large numbers during the war for use as Ship's tenders. Constructed as MFV 1576 by East Anglian