https://phys.org/news/2018-07-redefining-small-scale-fishing-english-fisheries.html

New research at the University, however, has shown that the impact of small-scale fishing vessels is currently skewed by a length-based definition of scale which doesn't account for fishing capacity.

Whilst some small boats catch small volumes of fish, others have the ability to catch significantly more, despite being grouped in the same 'small-scale' category, the report says.