Abstract
Ground and polished otolith sections, 0.2 mm thick, were produced from both sagittae of each fish, and repeated readings of the growth marks resulted in more accurate estimates of fish age. Supernumary zone formation in eel otoliths was a common phenomenon. The growth in length of the eels was accurately described by Bertalanffy's model using back-calculated lengths. Values of L ∞ = 1459 mm, K = 0.058 and t 0 = −0.869 years were determined. Mean incremental growth was calculated as 5–9 cm per year, showing that length increases rapidly with age. However, the growth of the eel population in Lake Fertő has become stunted, probably due to overstocking since 1975.
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