Volume 4, No. 02, Month APRIL, Year 2022, Pages 254 - 581

A comparison of the retinal structure in the zebra-snout seahorse (hippocampus barbouri jordan & richardson, 1908) between juveniles and adults in captivity

Ezra Mongkolchaichana, Jes Kettratad, Kitipong Angsujinda, Sinlapachai Senarat, Pisit Poolprasert, Natthawut Charoenphon, Pattanasuda Sirinupong, Supanut Pairohakul, Koraon Wongkamhaeng

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The activity of the sensory organ in the eye structure of the teleost fish is essential as it plays an important role in regulating fish-feeding behaviours. Unfortunately, the above information of zebra-snout seahorse Hippocampus barbouri, an aquaculture species in Thailand, has not been described. In this study, the eye structure, together with the retinal structure of juvenile [5th and 20th day after birth (DAB)] and adult (35th DAB), H. barbouri reared in captivity was investigated. All DABs were carried out and histologically observed. Light microscopic level explored the external-lateral surface of eye structure of H. barbouri, which consisted of the external, middle, and inner layers, as similarly reported in other teleost species. A well-differentiated retinal and photoreceptor cell layer were observed at 35th DAB compared to that at other DABs. This feature might be adequate to support the base of the increased feeding activity of adult seahorse in captivity for further research.


Eye structure, Histology, Photoreceptor cell layer, Seahorse, Juvenile, Thailand


Published by : Faculty of International Maritime Studies, Kasetsart University
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