Fig. 7
From: Nautilus: biology, systematics, and paleobiology as viewed from 2015
Bar graph showing percentage of nautilus shells with “major” shell breaks, which can be defined as running a least a quarter of the apertural perimeter, or the removal of about 10 g of shell followed by re-healing. This graph demonstrates the very high level of breakage in the Panglao population, which is also heavily fished