Abstract
The inner structure of oocytes was studied in 9 species of mesopelagic fish from the Myctophidae, Melamphaidae, Bathylagidae and Platytroctidae families. It was revealed that species of the same family (Myctophidae) differed less in oocyte structure than species from different families. Within the limits of subfamilies the myctophid fishes had the maximum similarity in their oocyte structure. It was established, that oocytes of fishes of different families differ by the size of vacuoles and yolk granules, and by their localization in cytoplasm.
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