The behaviours don’t always occur at the optimum time. Their behaviour has to be looked at statistically. Albert says, “Moon jellies have behaviours that help them avoid stranding. When moon jellies reverse their normal behavior in shallow water to position themselves near the surface, they place themselves in that ebb flow and get carried out into deeper water. That seaward flow at the surface is called an ebb flow. When waves break in shallow water and then recede, the overall flow of water is shoreward at the bottom and seaward at the surface. Albert has studied the behavior of moon jellies and has found that while they normally keep themselves a meter or two (about six feet) away from the surface of the water, if they bump into or sense the bottom in shallow water, they swim up and stay near the surface for some period of time. It turns out, however, that moon jellies have behaviors that almost always keep them off the beach.ĭr. So it seems like it might be pretty easy for a moon jelly to end up on the sand, doomed to disintegrate and be picked up by beach goers. ![]() ![]() By angling in one direction or another, they get some directional control, but for the most part, they can swim up and float down. But although they can swim by pulsing their bell to push themselves through the water, they’re not exactly strong swimmers. How do They Get on the Beach?: A moon jelly doesn’t want to be on the beach, of course.
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