This is a sea lamprey video.
From the BBC:
Monday, 3 January 2011
Blood-sucking fish feed on whales
By Ella Davies
Earth News reporter
Scientists studying whales in Canada have challenged previous theories that lampreys attach to whales purely to “hitch a ride”.
Photographs show bloody lesions after lampreys detached from whale hosts, indicating feeding.
Sea lampreys are parasitic fish that feed on others’ blood, attaching to the skin with a suction-cup like mouth.
Sea lampreys (Petromyzon marinus) are known to feed on a wide variety of fish using a funnel-like mouth filled with teeth and a razor-like tongue.
In the past lamprey teeth-marks have been identified on whale and porpoise bodies.
Based on these rare glimpses, certain scientists theorised that sea lampreys feed on cetaceans, but it was not possible from this evidence to say conclusively that they were drawing blood.
Others in the scientific community argued that P. marinus could merely be using cetaceans for transport, biting into their flesh in order to travel long distances.
However, during studies in the St Lawrence estuary, where the Great Lakes enter the Atlantic Ocean in eastern Canada, researchers resolved the debate.
The long-term study of minke whales in the area provided the first ongoing observations of sea lamprey and whale interaction.
Their findings were published in the Journal of Fish Biology. …
SEA LAMPREY FACTS
They are sometimes called ‘lamprey eels’ because adults are similarly long and lack scales
Sea lampreys secrete an anticoagulant from their mouths to stop prey’s blood from clotting
Ireland: A whale watching trip with Martin Colfer on the Rebecca C from Dunmore East 9th January produces the first inshore humpback whale sighting of 2011.
Whale evolution: here.
Antarctic minke whales are mating with Arctic cousins, DNA shows: here.
Lampreys give clues to evolution of immune system: here.
‘Vampire’ sea lampreys heat up for sex: here.
Field study suggests that sex determination in sea lamprey is directly influenced by larval growth rate: here.
- Scientists Plan to Exterminate Sea Lamprey Larvae in Lake Michigan with Poison (scienceworldreport.com)
- Killer whales, four species? (dearkitty1.wordpress.com)