Table 1.
Species composition and measures of infection of the ectoparasites (protozoans and helminths) of Oreochromis niloticus (L.) for the 29 extant farms in Yucatán, México. The calculation of these measures of infection was based on the 580 fish examined across all 29 tilapia farms
| Parasite species | Infection site | Estimated prevalencea (%) | Abundance | Intensity | Intensity | Intensity |
|---|---|---|---|---|---|---|
| (CI-95 %) | Mean ± SD | Mean ± SD | Median | Range | ||
| PROTOZOA | ||||||
| Trichodina sp. | Skin | 41 (36–45) | 12.04 ± 49.95 | 29.3 ± 74.68 | 10 | 1–980 |
| Vorticella sp. | Skin | 8 (5–8) | 1.22 ± 7.20 | 14.88 ± 20.89 | 6 | 1–82 |
| MONOGENEA | ||||||
| Cichlidogyrus sclerosus Paperna & Thurston, 1969 | Gills | 74 (70–77) | 73.83 ± 134.29 | 99.25 ± 147.51 | 46 | 1–11178 |
| Cichlidogyrus tilapiae Paperna, 1960 | Gills | 65 (61–70) | 32.35 ± 74.24 | 51.83 ± 91.52 | 28 | 1–885 |
| Cichlidogyrus dossoui Paperna, 1960 | Gills | 44 (39–48) | 8.64 ± 22.82 | 19.51 ± 31.06 | 12 | 1–356 |
| Cichlidogyrus longicornis Paperna & Thurston, 1969 | Gills | 39 (33–42) | 6.36 ± 20.71 | 16.37 ± 30.69 | 8 | 1–246 |
| Cichlidogyrus quaestio Douëllou, 1993 | Gills | 2 (1–1) | 1 ± 0.26 | 1.7 ± 0.94 | 2 | 1–4 |
| Cichlidogyrus sp. | Gills | 42 (37–46) | 15.98 ± 47.99 | 38.01 ± 68.19 | 14 | 1–746 |
| Cichlidogyrus halli (Price & Kirk, 1967) | Gills | 4 (1–4) | 1 ± 3.64 | 14.6 ± 12.57 | 7 | 1–44 |
| Gyrodactylus cichlidarum Paperna, 1968 | Fins, skin | 31 (26–33) | 2.00 ± 8.67 | 6.49 ± 14.86 | 9 | 1–173 |
| Enterogyrus malmbergi Bilong Bilong, 1988 | Intestine | 13 (10–15) | 1.06 ± 9.42 | 8.02 ± 24.93 | 3 | 1–169 |
aExpected apparent prevalence following [16]
Abbreviations: CI Confidence intervals, SD Standard deviation