The Shetland Fishermen's Association (SFA) is calling for a more nuanced, long-term approach to understanding marine biodiversity trends following the release of two new research papers.

The studies, published by the SFA itself, emphasize the need to consider historical data rather than focus on short-term fluctuations when assessing the abundance of marine species in the North Sea and Scottish waters.

One of the key findings reveals that fish populations in the North Sea have generally increased over the past 50 years, particularly in the last two decades, despite annual variations. This analysis is based on scientific fish stock surveys and assessments conducted by governments, which are used to set total allowable catches in annual negotiations between coastal states.

The studies also address Scotland's seabird populations, which have recently declined. However, when viewed over a longer time frame, the data shows that seabird numbers have only slightly decreased compared to 50 years ago, said the SFA. Furthermore, the overall biomass of seabird species has grown, suggesting that Scotland's seas remain healthy and productive.

The Scottish government has cited declining seabird populations as evidence of a biodiversity crisis. However, the SFA argues that this narrative may be misleading, as it overlooks that seabird populations had previously surged and are now returning to historical norms. The association believes that recent declines in seabird numbers may be tied to reduced fishing activity, which provides a food source for many seabird species.

SFA executive officer Daniel Lawson said fishing crews deeply understand marine ecosystems.

"These figures are a reminder that fishing crews know our seas better than anyone and see daily evidence of healthy and productive waters. Despite the misleading claims of some anti-fishing campaigners, North Sea fish stocks are far from in decline: we have seen a steady increase over the past 50 years, particularly in the last 20 years," he said.