Regional and seasonal variation in red sea urchin fishing.

Regional and seasonal variation in commercial fishing effort and landings (CDFW) from the three western subregions within the Channel Islands (2009–2011): total effort (number of receipts) and total landings (kg) across two red sea urchin gonadosomatic index (GSI) seasons (months of lowest [trough: April through June] and highest [peak: September through December]). (a) Two-way ANOVA results and (b) post hoc Student’s t-tests. Levels not connected by the same letter are significantly different. Least square (LS) means and standard error (SE) are displayed. Highest GSI season per region are highlighted in gray for ease of comparison.