Abstract
Sagittal otolith growth patterns were compared among three burbot,Lota lota, populations in northern Finland. Coastal burbot off Simo on the northern coast of the Bothnian Bay and lake burbot from Lake Kemijarvi represented populations with about 30% non-spawning adult individuals, while the river burbot from the River Kitinen spawned regularly. Irregular growth patterns i.e. crenulations on the dorsal edge of the sagitta and pointed extensions in the rostrum region and cloudy appearance of the sagittal otoliths, as observed by light, scanning and transmission microscopy, occurred significantly more often in the coastal and lake burbot than in the river burbot. This could not be explained by differences in age or size. Its possible relationship to supposed reproduction disorder is discussed.
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