Mercylla Sara Anak Joshua (2017) Colour vision and background colour preference of tropical long-finned eel (Anguilla sp.). Masters thesis, Universiti Malaysia Sabah.
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Abstract
Tank colouration is important for fish welfare in captivity. The present study investigated the vision capability of tropical long-finned eel as to determine the appropriate tank colour for optimum culture condition. Four experiments were conducted in this study. In classical conditioning test, elvers were trained to associate food reward with colour, and choose between this colour from many shades of grey. Data were analysed using Chi-square test. The findings show that elvers were able to discriminate colours. Secondly, retinal adaptation test was performed at total dark, 0.01, 0.1 and 1 Ix. The adaptation period was lh and all elvers were sampled for histology. It shows that the species has light-adapted retina up to 0.0llx, with the existence of retinal tapetum. Thirdly, background colour preference test was performed using white, black, blue, green, red, and yellow. Elvers were placed in round beakers wrapped with different colour pairs. Photos of elvers' head position on each colour pairs were recorded and analysed using Thurston's Law of Comparative Judgment. Findings reveal that the species has significant biased (a=0.05) towards white. Lastly, rearing experiment was conducted using black and white background colour tank for 28 days. The elvers' performance is not affected by background colours of tanks. Better growth (40.6±9.96%) and feeding intake (1.95±0.03g/day) were observed in black background colour tank, with no significant difference (P>0.05) in both treatments. In conclusion, tropical long-finned eel has colour vision with the presence of tapetum, and behaviourally preferred white background colour. Confinement in white background colour tank is recommended for better welfare of the species.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Tropical long-finned eel, Colour vision in fish, Tapetum lucidum, Tank colouration, Fish welfare |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling > SH1-691 Aquaculture. Fisheries. Angling > SH201-399 Fisheries > SH346-351 Fishery for individual species |
| Department: | INSTITUTE > Borneo Marine Research Institute |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 03 Jul 2025 10:27 |
| Last Modified: | 03 Jul 2025 10:27 |
| URI: | https://eprints.ums.edu.my/id/eprint/44283 |
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