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

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

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