Histological analysis invalidates macroscopically determined maturity ogives of the Kattegat cod (Gadus morhua) and suggests new proxies for estimating maturity status of individual fish

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Emerging Issues and Methodological Advances in Fisheries Reproductive Biology (2011, background): “In addition, although histological gonadal evaluation has been shown to be more accurate than macroscopic evaluation (Murua et al. 2003; Tomkiewicz et al. 2003; Vitale et al. 2006), there is no clear histological indicator that can be used to separate immature females from mature regenerating female”
Migratory behaviour of Atlantic cod Gadus morhua: natal homing is the prime stock-separating mechanism (2007, methodology): “Sexual maturity of each cod was classified according to a 4-stage macroscopic scale, used in the International Bottom Trawl Survey (IBTS; Vitale et al. 2006); a more detailed histological analysis was not possible because most of the fish had been deep frozen before being delivered to the…”
Reproductive Timing in Marine Fishes: Variability, Temporal Scales, and Methods (2011, background): “…classification based on histology has been shown to be more accurate than macroscopic classification (Murua et al. 2003; Tomkiewicz et al. 2003; Vitale et al. 2006), there is no standard level of gonadal development considered representative of “mature,” and often the criteria used are not…”