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Jellyfish do more than just drift

by Joe Turner January 28, 2015

If you thought jellyfish were simply plastic bags floating aimlessly in the ocean, think again!  Although jellyfish are often seen (and felt) near the surface of the water, they actually move through the entire water column.  In a study led by professor Graeme Hays of the Swansea University in the UK, the vertical movements of barrel jellyfish (Rhizostoma octopus) were monitored over several weeks using pressure sensitive data loggers attached to the stalk between the bell and the feeding tentacles.  As it turns out, these jellyfish move up and down through the water column (to 10 m depth) dozens of times a day regardless of the time of day, ocean conditions, or water temperature.

A barrel jellyfish swimming through the water column.
A barrel jellyfish swimming through the water column.

So, why are barrel jellyfish swimming so much?  They’re hunting! These predators cruise for large densities of phytoplankton and zooplankton by “sniffing out” their scent trails through different layers in the water column.  Once they have had their fill, the jellyfish return to their original depth.  This active hunting behavior has also been seen in the Atlantic sea nettle (Chrysaora quinquecirrha).  These findings just go to show that even the simplest of ocean creatures may actually be more complex than we imagined!

 

References:

Hays G, Bastian T, Doyle T, Fossette S, Gleiss A, Gravenor M, Hobson V, Humphries N, Lilley M, Pade N, and Sims D (2012) High activity and Levy searches: jellyfish can search the water column like fish. Proc R Soc B 279:465-473

Photo credit:  Paul Parsons




Joe Turner
Joe Turner

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