Further studies were to be carried out as part of the project in a bid to confirm if the drop was climate linked or a coincidence. "In six months to a year we will certainly be more confident in answering that," Williamson said. "We want to know where they are moving to and where water currents are taking them."
And although the cause of the decline is yet to be determined, its effect is sure to be another blow for the commercial fishing fleet.
"If ocean currents change then zooplankton is going to change and usually where there are changes things suffer before they get better," Williamson said.
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