http://www.uniongazette.com/technology/tagged-jellyfish-reveal-swimming-superpowers-h8261.html At least one study showed that jellyfish can swim against the current. That would mean that they aren't zooplankton which is how they are currently classed. I'm not a biologist. I am just a (scuba) diver who frequently encounters sea jellies and I found this article interesting.
That link you provided does not take me to any page that has any article about jellyfish. However as far as I know only the box jellyfish can swim against the current and it also has eyes. I'm not aware of any other jellyfish that have eyes and can swim against the current.
Here is the article: Jellyfish are able to detect water current and swim against it, according to a new study. What else can this investigation inform us about the animals? (Photo : Flickr / Sam DeLong) Jellyfish could lack brains, but these very simple animals are far stronger at swimming than biologists once believed, according to a new evaluation produced from data collected by tagging quite a few of the creatures. The invertebrates are capable to detect regional currents and travel against them, the study identified. This could assist clarify the formation of jellyfish "blooms," groupings of hundreds, thousands, or even millions of the primitive animals. Some of these blooms can stay with each other for months just before dispersing. Researchers tagged 18 huge barrel jellyfish with electronic loggers, permitting investigators to very carefully track the positions of the animals more than the course of the study. A easy cable tie was made use of to harmlessly attach the devices to the animals. As the animals swam, researchers also record currents and other ocean conditions. What they discovered in the Bay of Biscay, off the coast of France, was unexpected. "Detecting ocean currents with out fixed visual reference points is believed to be close to impossible and is not observed, for instance, in lots of migrating vertebrates such as birds and turtles. Jellyfish are not just bags of jelly drifting passively in the oceans. They are extremely advanced in their orientation abilities," Graeme Hays of Swansea University in Wales and Deakin University in Australia said. Researchers are baffled attempting to ascertain how these uncomplicated animals are able to establish the path of existing and journey on a path against the water movement. A single possibility is they move in response to ocean currents' shear forces acting on their bodies. Other suggestions propose infrasound or detection of the Earth's magnetic field as signifies by which the creatures may perhaps navigate. Jellyfish not only lack a brain, but they also lack a heart. These animals initially evolved 500 million years ago, and jellyfish can currently be found in each and every ocean around the globe. Directed swimming could aid jellyfish blooms preserve cohesion, preventing individual animals from acquiring caught in currents, and potentially washed ashore. Jellyfish swarms can be responsible for injuries to human swimmers who get stung by the animals, and the creatures can also clog fishing nets. On the other hand, jellyfish play a essential function in the atmosphere, serving as prey for leatherback sea turtles and other marine hunters. If the conclusions of this study apply to other varieties of jellyfish, the information may perhaps be utilized to greater predict the formation, movement, and distribution of blooms. Current study has shown sophisticated behavior from brainless animals, which includes carnivorous plants. Analysis of jellyfish behavior using tracking devices was profiled in the journal Current Biology.
