Table 6.
Morphological Deformities of Tilapia Collected Seasonally from the Tongkong and Kao-Ping Rivers in Southern Taiwan from 1994 through 1996. All Values Expressed as Percentages. A–autumn; S–spring.
| Deformity | Tongkong River (TKS) | Tongkong River (TKM) | Kao-Ping River (KP) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A/94 | S/95 | A/95 | S/96 | A/94 | S/95 | A/95 | A/94 | S/95 | A/95 | S/96 | ||
| Split fins | 46.0 | 4.0 | 53.0 | 35.3 | 37.5 | 1.0 | 37.0 | 52.0 | 20.0 | 62.0 | 40.0 | |
| Scale disorientation | 13.0 | 13.0 | 9.0 | 11.8 | 12.5 | 16.0 | 33.0 | 18.0 | 8.0 | 2.0 | 10.0 | |
| Mouth hyperplasia | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | |
| Muscle atrophy | 2.0 | 1.0 | 0 | 0 | 0 | 1.0 | 7.0 | 0 | 0 | 0 | 3.3 | |
| Opercular deformity | 8.0 | 2.0 | 9.0 | 5.9 | 12.5 | 0 | 13.0 | 14.0 | 0 | 2.0 | 6.6 | |
| Gill deformity | 2.0 | 1.0 | 6.0 | 5.9 | 25.0 | 0 | 23.0 | 2.0 | 4.0 | 0 | 6.6 | |
| Eye | Exopthalmia | 3.8 | 0 | 3.1 | 0 | 0 | 1.4 | 3.3 | 0 | 0 | 11.9 | 0 |
| Concave eye | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.4 | 0 | |
| Small eye | 0 | 1.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Blindness | 1.9 | 0 | 0 | 0 | 0 | 2.9 | 3.3 | 0 | 0 | 0 | 0 | |
| Lens deformity | 0 | 0 | 0 | 0 | 0 | 1.4 | 0 | 0 | 0 | 0 | 0 | |
| Opaque cornea | 5.8 | 4.4 | 31.3 | 17.6 | 12.5 | 8.6 | 20.0 | 4.5 | 37.3 | 54.8 | 0 | |
| Skeletal deformity | 6.0 | 0 | 0 | 5.9 | 0 | 3.0 | 7.0 | 0 | 2.0 | 5.0 | 0 | |
| Lower lip extension | 2.0 | 14.0 | 22.0 | 0 | 12.5 | 10.0 | 10.0 | 0 | 0 | 7.0 | 0 | |
| Tumor or bump | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Jaw deformity | 13.0 | 6.0 | 3.0 | 0 | 0 | 7.0 | 7.0 | 7.0 | 12.0 | 12.0 | 13.3 | |
| Head or jaw bent | 0 | 4.0 | 0 | 0 | 0 | 4.0 | 23.0 | 7.0 | 4.0 | 0 | 3.3 | |
| Mouth protrusion | 2.0 | 1.0 | 0 | 5.9 | 0 | 1.0 | 7.1 | 0 | 0 | 0 | 0 | |
| Fin deformity | 10.0 | 11.0 | 9.0 | 5.9 | 0 | 14.0 | 33.0 | 2.0 | 6.0 | 29.0 | 30.0 | |
| Miscellaneous | 2.01 | 1.01 | 0 | 0 | 0 | 0 | 3.01 | 0 | 2.01 16.02 |
0 | 3.31 | |
| Total number of fish | 52 | 91 | 32 | 17 | 8 | 70 | 30 | 44 | 51 | 42 | 30 | |
1
Body shape deformed;
2
Outward protrusion of mandibular cartilage.