engleski

Histological investigation of the eyes in certain marine fish species - preliminary research

Introduction: Detailed knowledge of the eye’s anatomy and histology of each fish species is a basic prerequisite for understanding the physiology of vision as well as the pathological changes. The life conditions and a great taxonomic diversity are continuously leaving significant traces in all fish’s organs and senses, especially on the eye. Methods: Research was carried out on six fish species Mullus barbatus, Diplodus annularis, Diplodus vulgaris, Spicara smaris, Gobius geniporus and Chelidonichthys lastoviza originating from different coastal areas of the Adriatic Sea. Five fish were sampled from each species. For the purpose of micro - morphological study, one eye from each fish was fixed in 10% buffered formaldehyde solution and stained with HE, Mallory and PAS. Results: Although the fish eye has the basic elements similar to terrestrial vertebrates, micro - morphological differences were found in each one of the components. Equally, the eye structures differed significantly between the investigated species, especially the retina of Diplodus annularis. Conclusion: The wide habitat range of fish species, differences in their living conditions as well as numerous adaptations to the life conditions, make the generalization of these aspects difficult in fish species. The fish were handled in accordance with the Croatian Animal Protection Act (2006), and the study protocol was approved by the Ethics Committee of the Faculty of Veterinary Medicine of Zagreb.

eye; marine fish; Diplodus annularis

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