Nova Scotia and southern New Brunswick are being monitored by scientists to see if a warm winter has accelerated the spread of slimy marine invertebrates. Six invasive sea squirt species, which cling to anything they come into contact with, have become established in Nova Scotia in the last decade. The creatures have become a major problem in the shellfish aquaculture sector, causing gear and product loss. Two more species are believed to have arrived. The invasives arrive primarily on vessel hulls and in ballast water discharge.

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