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Plaice, Pleuronectes platessa L. (1758), is one of the most important commercially exploited flatfish species in Europe. Like other species, it has suffered from overexploitation; however, currently its population is stable. It has a distribution range from the Mediterranean until White Sea, and is particularly abundant in the North Sea. Although there are many studies about the early life stages of this species, information on the northern limit of its distribution are scarce. Through the analysis of otolith microstructure it is possible to gather information about the early life stages in juvenile plaice, namely the hatching date, the date of settlement, the duration of larval stage, the duration of metamorphosis or the growth rate of a given individual. The objective of this work was then to estimate the total age, duration of each phase of the life cycle, the timing of hatching, as well as the settlement timing, relate hatching and settlement with water temperature and also estimate the global growth rate of individuals from Pleuronectes platessa sampled in Valosen (Bodo, Norway) during the years 2005 and 2006, analyse the interanual variability in this location and compare the results with places further south of the distribution of plaice. By optical microscopy 30 otoliths of each year were analysed, belonging to individuals with sizes between 14 and72 mm. The ages for 2005 were estimated between 41 and 99 days and 50 and 129 days for 2006. The timing of hatching in 2005 took place between April and May, while in 2006 took place between March and June. In both years the duration of larval stage were similar. The settlement took place in June, in 2005, and was extended from May to July in 2006. Regarding to growth, significant differences between years were found, with individuals caught in 2006 having a higher growth rate than the ones caught in 2005. The fact that, in 2006, hatching and settlement peaks had occurred approximately one month apart from 2005, can be related to the difference in sea water temperatures, since this was, on average, higher in 2006. Temperature may also be a possible explanation for the higher growth rate observed in 2006. It is also possible to say that, when comparing with data from other authors, a latitudinal trend was observed for this species, in several features of the life cycle, since hatching and settlement occurs first in the year at lower latitudes, where the sea water temperature is higher than at higher latitudes, where the sea water temperature is lower. However, the duration of the larval stage was similar to other locations, opposing the positive trend for an increase of the larval duration with latitude. FCUP Interannual variability in early life history of Pleuronectes platessa (L.) using otolith microstructure vi

Determination of interannual variability in early life history of Pleuronectes platessa (L.) using otolith microstructure