Histological characteristics of oocyte differentiation in the captive longnose seahorse Hippocampus trimaculatus (Leach, 1814)

Author:

Senarat Sinlapachai12,Chumee Supawadee2,Kaneko Gen3ORCID,Wandee Satiya4,Kenthao Anan5,Kongtueng Piyamat6,Uribe Mari Carmen7,Nganvongpanit Korakot6,Iida Atsuo8,Sornying Peerapon9

Affiliation:

1. Division of Biological Science, Faculty of Science Prince of Songkhla University Songkhla Thailand

2. Department of Marine Science and Environment, Faculty of Science and Fisheries Technology Rajamangala University of Technology Srivijaya Trang Thailand

3. College of Natural and Applied Science University of Houston‐Victoria Victoria Texas USA

4. Ranong Coastal Aquaculture Research and Development Center Ranong Thailand

5. Department of Biology, Faculty of Science Naresuan University Phitsanulok Thailand

6. Research Center for Veterinary Biosciences and Veterinary Public Health, Faculty of Veterinary Medicine Chiang Mai University Chiang Mai Thailand

7. Laboratorio de Biologıa de la Reproduccion Animal, Departamento de Biologıa Comparada, Facultad de Ciencias Universidad Nacional Autonoma de Mexico Ciudad de México Mexico

8. Department of Animal Sciences, Graduate School of Bioagricultural Sciences Nagoya University Nagoya Japan

9. Faculty of Veterinary Science Prince of Songkla University Songkhla Thailand

Abstract

AbstractThis study aimed to explore the reproductive histology and oocyte differentiation of the longnose seahorse Hippocampus trimaculatus (Leach, 1814) in captivity. Five mature healthy females were histologically observed. The reproductive systems of the five specimens exhibited similar morphological characteristics with a pair of saccular creamy white ovaries merging caudally into a single gonoduct. There were two germinal ridges lined with a layer of germinal epithelium (GE). The ovarian maturation of this species was considered asynchronous. The oogenic cells were classified into oogonia and oocytes at several developmental phases based on their size and characteristics. Oogonia were identified among the connective tissue in the middle area of the GE. The stromal compartment contained oocytes that were classified into four distinct phases: the primary growth (PG) phase having two steps (perinucleolar and oil droplets‐cortical alveolar steps) and the secondary growth (SG) phase with three oocyte types, including early SG oocytes, late SG oocytes, and fully grown oocytes. The atretic oocytes (AO) were observed in all stages of oogenesis. Postovulatory follicles were also seen among the ovarian connective tissue. The occurrence of postovulatory follicles suggested that the specimens analysed in this study were in the spawning period. This research provides new insights into the identification of the reproductive cycles and morphological characteristics of the ovary of H. trimaculatus.

Funder

Chiang Mai University

Publisher

Wiley

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