A comparison of the retinal structure in the zebra-snout seahorse (Hippocampus barbouri Jordan & Richardson, 1908) between juveniles and adults in captivity

Authors

  • Ezra Mongkolchaichana Department of General Education, Faculty of Science and Health Technology, Navamindradhiraj University, Bangkok 10300, Thailand
  • Jes Kettratad Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
  • Kitipong Angsujinda Marine Ecology and Marine Resources Utilization Research Unit, Aquatic Resources Research Institute, Chulalongkorn University, Bangkok 10330, Thailand
  • Sinlapachai Senarat Department of Marine Science and Environment, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang 92150, Thailand
  • Pisit Poolprasert Program of Biology, Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phitsanulok 65000, Thailand
  • Natthawut Charoenphon Department of Anatomy, Faculty of Medical Science, Naresuan University, Phitsanulok 65000, Thailand
  • Pattanasuda Sirinupong Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani 94000, Thailand
  • Supanut Pairohakul Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
  • Koraon Wongkamhaeng Department of Zoology, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand

DOI:

https://doi.org/10.33175/mtr.2022.254581

Keywords:

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

Abstract

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.

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Published

2022-02-01

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Vol. 4 No. 2 (2022): April - June

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