Figure 4 | Scientific Reports

Figure 4

From: Analysis of bigmouth buffalo Ictiobus cyprinellus spawning phenology in Minnesota reveals 50-year recruitment failure and conservation concern

Figure 4

(a) Distribution of gonadosomatic index (GSI) for female (red) and male (blue) bigmouth buffalo captured by anglers in 2022. The bimodal distribution for each sex is summarized with box & whisker plots indicting minimum, 1st quartile, median, 3rd quartile and maximum values, with dashed line indicating least-square mean for each mode. Hatched box plots represent pre-spawn individuals, solid box plots represent post-spawn individuals). (b) GSI declined significantly with day harvested, sex, and their interaction. (c) When spawning status (pre-spawn versus post-spawn) was assigned by GSI, least-square mean day of harvest differed significantly for females and males post-spawn, but not pre-spawn (as determined by a Tukey test following two-way ANOVA, as indicated by upper case letters).

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