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Morphological characterization of the digestive systemand health status of the invasive shortfin molly Poecilia mexicanaSteindachner, 1863, in Thailand |
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| รหัสดีโอไอ | |
| Creator | 1. Rossanan Aiyala 2. Sinlapachai Senarat 3. Jes Kettratad 4. Kitipong Angsujinda 5. Wannee Jiraungkoorskul 6. Supparat Kong-oh 7. Gen Kaneko 8. Ezra Mongkolchaichana 9. Natthakitt To-orn |
| Title | Morphological characterization of the digestive systemand health status of the invasive shortfin molly Poecilia mexicanaSteindachner, 1863, in Thailand |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2565 |
| Journal Title | Songklanakarin Journal of Science an Technology (SJST) |
| Journal Vol. | 44 |
| Journal No. | 1 |
| Page no. | 281-288 |
| Keyword | digestive histology, gut content analysis, histopathology, ovoviviparous fish |
| URL Website | https://rdo.psu.ac.th/sjst/index.php |
| ISSN | 0125-3395 |
| Abstract | The shortfin molly, Poecilia mexicana Steindachner, 1863, is an ovoviviparous fish. Unfortunately, the structuralcharacteristics related to the digestive biology of this fish are still poorly known. In the current study, detailed characterization ofthe digestive system was conducted for P. mexicana from natural brackish water in Thailand, based on morpho-histologicalobservation and gut content analysis. Forty fish were collected in February 2020 from a small canal at Samut Prakan province.They were then classified into two size groups for 2.00-4.00 and 4.01-6.00 cm in total length. Results showed that themorphology of the digestive tract is similar in the two groups; it was composed of the terminal mouth, the villiform teeth in bothupper and lower jaws, pharyngeal teeth, short esophagus and very long intestine. The intestine coefficients of the two groupswere 1.64 ยฑ 0.37 and 2.23 ยฑ 0.38, respectively, suggesting that P. mexicana is an omnivorous fish. The gut contained a few preyitems in both groups, in which detritus and pieces of plants dominated followed by phytoplanktons, indicating that this fish is adetritus feeder in the small canal. Importantly, many histopathological alterations were recorded, especially necrotic acinar cellsand melanomacrophage centers. Although this species is generally considered to be tolerant to environmental changes, theseresults suggest that environmental problems had caused several lesions (gill, liver and kidney) in P. mexicana. Overall, this studyprovides basic knowledge about feeding ecology of this poorly studied species, warranting further research. |
