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Offshore platforms could be hot spot of fish abundance

Oilfield Technology,

According to research conducted by the University of Aberdeen’s Oceanlab, offshore oil and gas platforms could be serving as beneficial environments for populations of prime commercial fish species such as cod and haddock.

Research have analysed of long-term bottom trawl data on fish distribution in relation to offshore installations, and found that the structures could serve as reef habitat for commercially important species.

“There are currently no less than 500 offshore installations extracting oil and gas primarily from the continental shelf in the North Sea and, since the first installation, more and more researchers have been aware that a variety of commercially important fish species such as cod, haddock and saithe gather in substantial numbers around these artificial structures,” said Dr Toyonobu Fujji.

“Currently, all the offshore platforms and the safety zones around these platforms, combined, account for only 0.08% of the surface area of the North Sea. However, the proportion of fish abundance estimated to aggregate around these structures was much higher than the surface area alone would suggest.

“We still don’t know exactly why they are gathering there. It could be because there are more feeding opportunities or possibly because they provide places for them to shelter or hide.

“But if they are using these habitats as nursery or spawning grounds then the implications of the physical presence of these structures could be important since such biological mechanisms strongly drive the future population dynamics of the fish.”

Dr Fujii says more research is needed into the causes and seasonal nature of such phenomena in association with artificial structures.  He also wants to explore whether other fish species such as flatfish or pelagic fish (e.g. mackerel) show similar trends and are attracted to these sites.

“Given the magnitude of scales at which fish movement could be influenced by the offshore platforms, such knowledge will be of critical importance for future spatial management of seafloor as well as sustainable fisheries management, perhaps this is even more pertinent now with the expected expansion of offshore renewable energy developments.”

The World Conference on Marine Biodiversity has been organised by the Universities of Aberdeen and St Andrews and is taking place between September 26 and 30.

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