The more boats there are, the fewer fish species, according to Victoria researchers


The activities of offshore vessels as well as marinas and ferry terminals are detrimental to fish diversity in the Pacific coast’s seagrass beds, say researchers at the University of Victoria. The latter examined the different species present in these underwater meadows.

According to the study published in the scientific journal Global Change Biology, places where there are significant human activities can only accommodate a few more robust fish species.

“There were more resistant species in these areas, such as the Threespine Stickleback, which adapts well to life with humans,” says Josie Iacarella, co-author of the study, who conducted the analysis. 89 seagrass beds on the coast. Sticklebacks breed quickly and support a wider salinity margin.

The postdoctoral researcher adds that rarer and more vulnerable species, such as redfish, tend to be in habitats that are immune to human activities.

These species are particularly sensitive to vessel noise and anchorage in seagrass beds, such as near Saanich Inlet and the ports of Victoria and Sooke.

“The turbulence of the propellers raises the seabed and disturbs the water,” said Mrs. Iacarella. So, it becomes difficult for the fish to find food. ”

It states that underwater grasslands on the west coast must be protected to preserve biodiversity because species do not survive when their habitat is restricted to a restricted area.

To have large populations, you need several places where they can survive.

Josie Iacarella, Postdoctoral Researcher at the University of Victoria
Ms. Iacarella believes that even in the Strait of Georgia, which is heavily used by oil tankers and other vessels, human activities could be reduced to minimize the impact on fish.


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