Supplementary Material

Supplementary Fig. 1. (a) Length frequencies of individuals measured on-board commercial fishing vessels in the study area by gear (all months). (b) Length frequencies of individuals measured on-board commercial fishing vessels in the study area by gear and month.

Supplementary Fig. 2. (a) Effect of statistically significant independent variables on the dependent variables examined according to the generalized additive models (GAMs) results for juvenile fish (TL < TL₅₀). Dashed lines indicate 95% confidence intervals. Top row: total length (TL), second row: gonadosomatic index (GSI), third row: hepatosomatic index (HSI), bottom: condition factor (CF). Day number = 0: 31/10/2013 (first sampling day for catch data). Unknown: unidentified sex (immature individuals of stage-1 or individuals at spent gonad stage unidentifiable regarding sex). Partial effect of depth on HSI is denoted by light grey to indicate it is not comparable with the other graphs in the same panel column. (b) Effect of statistically significant independent variables on the dependent variables examined according to the generalized additive models (GAMs) results for adult (potentially mature) fish. Dashed lines indicate 95% confidence intervals. Top row: total length (TL), second row: gonadosomatic index (GSI), third row: hepatosomatic index (HSI), bottom: condition factor (CF). Day number = 0: 31/10/2013 (first sampling day for catch data). Unknown: unidentified sex (immature individuals of stage-1 or individuals at spent gonad stage unidentifiable regarding sex).

Supplementary Table 1. Variable selection for inclusion in generalized additive models based on Akaike information criterion (AIC). Selected combinations of variables for inclusion in each final model (based on lowest AIC) are denoted in grey. Δ-AIC: difference between each model’s AIC and the AIC of the model finally selected. (A) Models on total length (TL), gonadosomatic index, (GSI), hepatosomatic index (HSI), condition factor (CF)-individual fish data. (B) Models on CPUE-catch data: Delta-X-error model for trawl and trammel net (separate modeling of presence-absence and positive/non-zero abundance values) and abundance for gillnet. lon: longitude, lat: latitude.

Supplementary Table 2. Age-length key for males, females and total fish (including immature fish). U: Age not discerned.

© EDP Sciences 2017