Drones giving B.C. researchers new perspective on jellyfish populations

Photos taken by the team’s drone show vast swaths of the gelatinous creatures speckling the ocean, creating cloud-like formations in the water.

Combining data from the drone with information gathered from nets and underwater cameras, Hunt and Schaub were able quantify the masses, determining that the weight of the blooms can vary from 60 to 120 tonnes.

The number is “enormous” and exceeded the team’s expectations, Hunt said.

He said it’s unclear if the population is growing, because this is the first time scientists have been able to fully study these jellyfish.

Globally, there has been a trend towards an increase in such blooms and there is anecdotal evidence of the same thing happening on the west coast, Hunt said.

Accurate measurements could help determine what impact the jellyfish are having on the rest of the ocean.

“With a good estimate of the biomass, we can make better estimates of what type of effect they might be having in the ecosystem through competition and predation,” he said.

Jellyfish feast on a variety of ocean fare, including plankton and juvenile fish. Their appetites make them competitors for and predators of several coastal fish species, including herring and salmon, Hunt said.

He said it’s important to be able to assess the number of jellyfish.

“This can have a really major impact on populations. There can be really high predation mortality on these larval stages of coastal fish species,” Hunt said.

Now the researchers want to add drones to routine monitoring of jellyfish in the area so they can get a better idea of what’s happening to the population and how factors like water temperature are influencing any changes.

— Follow @gkarstenssmith on Twitter

Gemma Karstens-Smith, The Canadian Press

by Canadian Press

Drones giving B.C. researchers new perspective on jellyfish populations

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