When you think of parasites, you probably think of worms and bugs… but in the brutal realm of the ocean, it seems that anything goes.
What makes these cases interesting is that the eels – the only species of their genus – don't need to be parasites. They can live quite happily out in the ocean, just eeling about, scavenging theThe larger of the two eels where it was found in the heart of the shark. halibutThe eel was not known to parasitize sharks until a male shortfin mako shark was recovered from the western North Atlantic seafloor in June 1992 and brought to land at Montauk, New York.
They were dead, of course; they'd been fished out of the ocean and put in cold storage. But they appeared to have been healthy before that. Moreover, there was evidence that the eels had been merrily ensconced in the shark's heart for some time. The team believes that what may have happened is that the eels found the shark injured or dead by the longline hook and took the opportunity to feast.
We know even less about the sand tiger. Scant details of its case were shared in a 2007 paper about the shark's population range and density: a female shark, 3.7 meters in length, was found drifting in the ocean, dead, near Fuerteventura in the Canary Islands. Several snubnosed eels were found"within the heart, body cavity, and adjacent dorsal musculature" of the shark.
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