Photos and measurements of otoliths from fish caught in the southern part of the North Sea

<em>Photos and measurements of otoliths from fish caught in the southern part of the North Sea</em> is a photo dataset published by the Research Institute for Nature and Forest (INBO). It contains photos of fish otoliths – taken by a binocular microscope on a black background and edited to include a ruler – and measurement/reference data for these otoliths and fish. The dataset can be used as reference data to identify fish species in the southern part of the North Sea based on their otoliths, e.g. dietary/food ecology research of seabirds. <strong>Files</strong> <strong>reference_data.csv</strong>: Fish information (scientific name, sampling information, length) and otolith measurements (width/height). Each row corresponds to a fish, which <code>fish_id</code> can be found in the otolith photo name. <strong>Scientific name.zip</strong>: Photos of otoliths, grouped by species. Photo names are of the form <code>fish_id_suffix.jpg</code>, where <code>suffix</code> indicates if it was a left (<code>Lx</code>) or right (<code>Rx</code>) sagittal otolith or a smaller lapillus/asteriscus (<code>Bx</code>) otolith.