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Fish larvae of European smelt Osmerus epedanus L. were collected in the lower Elbe River, Germany, and aged using daily growth increments in the otoliths The otolith microstructure in the sagittae of larvae caught within a 24 h period was examined and the daily pattern in increment formation was validated using the marginal increment technique. Smelt larvae were also caught at a fixed station between April and May 1993. The formation of the first daily growth increment corresponds to the onset of exogenous feeding. The width of growth increments, radii, perimeters and areas of the otoliths were measured using an image analysis system. A power function was fitted between otolith radius and standard length Integrated son~atic growth rate was estimated as 0.556 mm d-l from the linear relationship between standard length and the number of daily growth increments enumerated from the sagittae. Otolith growth was best described using a l-cycle Gompertz function. Backcalculated hatching dates showed 2 main hatchlng batches during April 1993 and the time span of the hatching was not longer than 16 d. There were no significant differences among back-calculated otolith growths of 3 different hatching groups. At oxygen concentrations of <4.5 mg I' , recent otolith growth showed high variability and negative values.

Daily growth increments in the otoliths of European smelt Osmerus eperlanus larvae