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The size structure of fish-communities is an emergent high-level property ofmarine food webs responsive to changes in structure and function. To measurethis food web property using data arising from routine fisheries surveys, asimple metric known as Typical Length has been proposed as more suitable thanthe Large Fish Indicator, which has been highly engineered to be responsive tofishing pressure. Typical Length avoids the inherent dependence of the LargeFish Indicator on a parameter that requires case-by-case adjustments. UsingIBTS survey time series for five spatial subdivisions of the Greater North Sea,we show that the Typical Length can provide information equivalent to the LargeFish Indicator when fishing is likely the strongest driver, but differences canalso arise. In this example, Typical Length exhibits smaller randomfluctuations ("noise") than the Large Fish Indicator. Typical Length is alsomore adaptable than the Large Fish Indicator and can be easily applied tomonitor pelagic fish in addition to demersal fish, and together withinformation on the potential growth of the fish community, a proxy of which canbe derived from the Mean Maximum Length indicator, it is possible to partitionchange in community composition from change in size structure. This suggeststhat Typical Length is an improvement over the Large Fish Indicator as a foodweb indicator with the potential to offer further insight when considered inconjunction with indicators of community composition.

New univariate characterization of fish community size structure improves precision beyond the Large Fish Indicator