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The correction notice addresses an error in Figure 9 of the original publication by Sauger et al. on the histologic analysis of oogenesis in Pleuronectes platessa. The corrected figure includes a boxplot of gonadosomatic index, percentage of animals by oocyte stage, and mean % germline cell surface. The authors utilized stereology to identify germline cells and computed percentages for each maturity phase. The correction was made to accurately reflect the data presented in the study. [Extracted from the article]

Simple Summary: Histology and stereology were used to estimate the sexual maturity phase for the European Plaice, as well as a description of the oogenesis cycle and size at first maturity. This study provides a method to accurately determine a key parameter for fisheries management that may be used for other species. The following paper gives a detailed description of the oogenesis cycle for the European Plaice (Pleuronectes platessa), from oogonia to post-ovulatory follicle, including ovarian follicle and zona pellucida sizes. Noteworthy particularities were the difficulty in identifying cortical alveoli due to their very small size. Quantitative histology (stereology) on histological slides was used to determine a first size at maturity for females from the English Channel, which was found to be smaller compared to the literature (19 cm). Stereology also determined a first spawning event starting in January, with a peak in February and ongoing until March. Moreover, the use of stereology showed misclassifications for individuals categorized into a maturity phase using a macroscopic visual method. Misclassifications were found with individuals that had spawned (D) but were put under the immature (A) phase, and individuals in development (B) classified under D. [ABSTRACT FROM AUTHOR]

The North Sea plaice, Pleuronectes platessa (Linnaeus, 1758), is a commonly studied commercial flatfish with poorly known ovarian histology. The following dataset is a collection of female plaice gonad images and their corresponding histological slides, collected during a complete season of the plaice's reproduction cycle. Stereology was used to determine the percentage of different structures found throughout the ovaries. Inter-agent calibrations were accomplished in order to harmonize the stereological readings, and were based on a comprehensive reading protocol and histological lexicon that were specifically written for the plaice's ovaries. The distribution and homogeneity of the different cell types found throughout the ovaries were also evaluated. This dataset can be used to automate the stereological reading process (through statistical learning methods for example) or to objectively determine the plaice's maturity phase, and link that information to either macroscopic measurements or through image analysis of the full ovaries. Measurement(s) female gonad • ovary morphology trait • cell type Technology Type(s) photography • stereology • histological assay Factor Type(s) phase of reproductive cycle Sample Characteristic - Organism Pleuronectes platessa Sample Characteristic - Environment sea Machine-accessible metadata file describing the reported data: 10.6084/m9.figshare.12296054 [ABSTRACT FROM AUTHOR]

Nurseries are crucial habitats that play an important role for many marine fish species; which rely on them to complete their life cycle. Juvenile stages of dab (Limanda limanda), plaice (Pleuronectes platessa) and sole (Solea solea) present in the English Channel are common in the Seine estuary nursery grounds. To further explore the estuary's nursery function, we investigated the heterogeneity in spatial distribution patterns of these three flatfish at their juvenile stage, between 1996 and 2019. We used geostatistical indices and multivariate analyses to demonstrate species specific spatiotemporal dynamic. Sole favoured the most upstream part of the nursery, dab was found in the most marine areas, and plaice preferred the southern coast. We then performed clusters analysis based on spatial indices and spatial patterns extracted from a Minimum/Maximum Autocorrelation Factor (MAF). We showed that the average positions of the three flatfish species were stable across time. Each flatfish appeared to have its own spatial preference inside the nursery. No temporal variability in the spatial pattern nor trend was found that would correspond to the major stress imposed on the community by harbour development within the 2000–2005 period. We conclude that segregation of the juveniles of the three species within the nursery may reflect different ecological needs and underlying mechanisms to minimise interspecific competition. [Display omitted] • A clear segregation was shown between three populations of flatfish juveniles. • Described spatial pattern were highly stable despite significant harbour development. • Spatial variability reflected species specific response rather than human disturbance. • Biotic pressures seem to have a major influence in spatial distribution in the nursery. [ABSTRACT FROM AUTHOR]