Table 4.
Morphological Deformities of Tilapia Collected from Six Stations in Four Rivers in Southern Taiwan in Autumn, 1994. All values expressed as percentages of total fish caught at each station. TKS–Tongkong River upstream station; TKM–Tongkong River mouth station; KP–Kao-Ping River station; EJ1–Era Jiin River downstream station; EJ2–Era-Jiin River upstream station; LB–Lin Bien River.
| Deformity | TKS | TKM | KP | EJ1 | EJ2 | LB | |
|---|---|---|---|---|---|---|---|
| Split fins | 46.0 | 37.5 | 52.0 | 87.5 | 62.5 | 50.0 | |
| Scale disorientation | 13.0 | 12.5 | 18.0 | 6.2 | 25.0 | 0 | |
| Mouth hyperplasia | 2.0 | 0 | 2.0 | 0 | 0 | 0 | |
| Muscle atrophy | 2.0 | 0 | 0 | 0 | 0 | 0 | |
| Opercular deformity | 8.0 | 12.5 | 14.0 | 12.5 | 0 | 3.0 | |
| Gill deformity | 2.0 | 25.0 | 2.0 | 31.2 | 16.7 | 3.0 | |
| Eye deformity | Exopthalmia | 3.8 | 0 | 0 | 0 | 0 | 0 |
| Concave eye | 0 | 0 | 0 | 0 | 0 | 0 | |
| Small eye | 0 | 0 | 0 | 0 | 0 | 0 | |
| Blindness | 1.9 | 0 | 0 | 0 | 0 | 0 | |
| Lens deformity | 0 | 0 | 0 | 0 | 0 | 0 | |
| Opaque cornea | 5.8 | 12.5 | 4.5 | 6.2 | 0 | 3.0 | |
| Skeleton deformity | 6.0 | 0 | 0 | 0 | 0 | 3.0 | |
| Lower lip extension | 2.0 | 12.5 | 0 | 31.3 | 16.7 | 0 | |
| Tumor or bump | 2.0 | 0 | 0 | 0 | 4.2 | 0 | |
| Jaw deformity | 13.0 | 0 | 7 | 37.5 | 16.7 | 6 | |
| Head or jaw bent to side | 0 | 0 | 7.0 | 0 | 0 | 3.0 | |
| Mouth protrusion | 2.0 | 0 | 0 | 0 | 0 | 0 | |
| Fin deformity | 10.0 | 0 | 2.0 | 0 | 0 | 6.0 | |
| Miscellaneous | 2.0* | 0 | 0 | 0 | 0 | 0 | |
| Total number of fish | 52 | 8 | 44 | 16 | 24 | 32 | |
*
Body shape deformed.