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Washington [US], March 21 : Jellyfish may be both predator and prey as they drift across ocean currents. They eat nearly anything they can get their hands on and follow the traditional ocec pattern of giant consuming small. According to a new University of British Columbia research on these gelatinous globs, jellyfish may become more nutritious as they get larger.As jellyfish grow, their size changes largely due to the chances of prey encounter, the length and number of tentacles, and their bells (the umbrella-like part of them). As a result, smaller jellyfish eat phytoplankton, microzooplankton, and eggs, while larger jellyfish can eat all of that plus shrimp and even fish. However, jellyfish are also largely preyed upon by mals in and out of the water. Jellyfish are important prey because they are easy to digest due to their high water content, and they are easy to catch."Our study looked more closely to see if there was any information we could draw about nutrition in jellyfish," said Jessica Schaub, lead author and a UBC PhD student at the Institute for the Oceans and Fisheries and the Department of Earth, Oceans and Atmospheric Sciences."This information helps us understand the true value of jellyfish as food. We looked at how the energy that moves through a food web might look as it moves through jellyfish. What they eat, what they are composed of, and how this might affect what eats them." In Heriot Bay, B.C., for example, the moon jelly may often find themselves being eaten by other jellyfish, fish and other invertebrates.Schaub, and her team, which includes associate professor Dr. Brian Hunt, who heads the Pelagic Ecosystem Lab at the Institute for the Oceans and Fisheries, took a look at how jellyfish size, diet and nutritional quality all mesh together. Nutritional quality can reflect an orgsm's life history the composition of a jellyfish can change in response to individual changes in diet and physiological changes.The team, over two one-day periods in July and September 2019, collected 150 moon jellyfish and measured their size. After drying them, they measured the jellyfish for specific compositional elements.Schaub described what they discovered."First, we confirmed what was already known: jellyfish eat bigger prey as they grow, which means they also occupy a higher position in the food web as they grow," she said. "We also found that some of the concentrations of 'healthy fats,' increase as jellyfish grow. We found some evidence that these changes might be influenced by their diet, and as they feed on bigger prey with higher levels of fatty acids, the jellyfish accumulate more of these fatty acids.""This means bigger jellyfish might be considered more nutritious," said Schaub.The study found size-trends which emphasize just how important it is to consider jellyfish size when we are talking about marine food webs. Including these creatures will not only help their representation in food web models, but can also inform other studies.Looking towards the future, Schaub described what may come next."Our recommendation for future studies on jellyfish predators is to consider size more thoroughly. Feeding on a young, small jellyfish is different than feeding on a larger and older jellyfish."Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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Technology :Jellyfish size may influence their nutritional value: Study

Washington [US], March 21 : Jellyfish may be both predator and prey as they drift across ocean currents. They ... ...