petromyzon การใช้

• Sea lampreys ( " Petromyzon marinus " ) have been seen attached near the cloaca of this shark.
• These include Coregonus oxyrinchus, Coregonus lavaretus, Alosa alosa, Acipenser sturio, Petromyzon marinus, Salmo salar, Alosa fallax, Salmo trutta trutta
• In 1860, Ernst Reissner, anatomist at the University of Dorpat, published a monograph on the microscopic structure of the spinal cord of " Petromyzon fluviatilis ".
• In 1921 sea lamprey or Lamprey Eel ( " Petromyzon marinus " ) invaded the Great Lakes through the Welland Canal, though, significantly reducing the numbers of lake trout and whitefish.
• The silver lamprey should not to be confused with the sea lamprey ( " Petromyzon marinus " ), which has caused considerable damage to native fish populations in the Great Lakes region.
• Thus, in 1980, the spelling with a " t " won out, and in 1981, it became official that all higher-level taxa based on " Petromyzon " have to start with " Petromyzont-".
• They are also of special interest for sea lamprey Petromyzon marinus; for the range of river habitats including beds of submerged aquatic plants often dominated by water-crowfoot Ranunculus spp ., as well as a variety of associated riverside habitats ."
• Scientists believe the biggest threat, sea lampreys ( Petromyzon marinus ), first reached the western lakes as early as the 1920s by way of the Welland Canal, which connects the Erie Canal _ and beyond it the Hudson River _ with Lake Erie.
• The reduced abundance is believed to result from the cumulative effects of several factors, including the expansion of non-native species such as alewife, rainbow smelt ( " Osmerus mordax " ) and sea lamprey ( " Petromyzon marinus " ).
• Lampreys live mostly in coastal and fresh waters, although some species ( e . g . " Geotria australis ", " Petromyzon marinus ", and " Entosphenus tridentatus " ) travel significant distances in the open ocean, as evidenced by their lack of reproductive isolation between populations.
• Parasitic sea lamprey ( " Petromyzon marinus ", alewife ( " Alosa pseudoharengus " ) and rainbow smelt ( " Osmerus mordax " ), in particular, have been implicated in their demise, and are believed to have stressed populations to the extent that previously sustainable levels of exploitation became unsustainable.
• Off Iceland, 45.2 per cent ( 85 of 188 ) of sampled minke whales bore old scars from attacks by the sea lamprey " Petromyzon marinus ", while a further 10.6 per cent had fresh scars on the posterior part of their flanks; five were found with live lampreys still clinging to their flesh.
• The mucus and serum of several lamprey species, including the Caspian lamprey ( " Caspiomyzon wagneri " ), river lampreys ( " Lampetra fluviatilis " and " L . planeri " ), and sea lamprey ( " Petromyzon marinus " ), are known to be toxic, and require thorough cleaning before cooking and consumption.