Table 1. Prevalences and mean intensities (± SD) of symbionts found on Portunus pelagicus (n = 479) along Vietnamese coastline

Name of species	Prevalence (P) Mean intensity (MI)	Infection sites	Crab populations (P/MI)			Crab sexes (P/MI)		Crab size groups (P/MI)
Name of species	Prevalence (P) Mean intensity (MI)	Infection sites	North	Central	South	Male	Female	< 80 mm	80–99 mm	100–119 mm	> 120 mm
Arthopoda
Octolasmis angulata¹⁾	75.57 57.26 ± 93.06	(2), (3), (5)	82.55 65.63^y ± 73.2	72.00 63.47^y ± 16.75	73.08 37.01^x ± 71.47	77.12 35.23^x ± 46.46	74.07 79.53^y ± 19.37	23.53^a 13.69^x ± 36.34	72.73^b 19.44^x ± 26.19	85.04^c 49.23y ± 66.1	96.92^d 103.29^z ± 129.2
O. neptuni²⁾	11.48 21.55 ± 30.26	(2), (3), (5)	0.67^a/2.00^x	9.00^b 6.61^x ± 5.56	27.69^c 29.56^y ± 35.1	13.98 15.48 ± 17.80	9.05 30.64 ± 40.94	0	3.25^a 6.20 ± 5.15	11.81^b 7.67 ± 5.56	26.92^c 29.69 ± 35.02
O. warwickii²⁾	15.45 23 ± 31.12	(1), (2), (3), (4)	16.78^b 4.92^x ± 7.94	25.5^b 33.40^y ± 34.92	1.54^a 4.5^x ± 4.95	9.75^a 17.65 ± 22.47	20.99^b 25.41 ± 4.04	0	9.47^a 15.20 ± 24.48	17.32^b 20.73 ± 24.03	28.46^c 27.51 ± 35.98
Dianajonesia tridens²⁾	19.00 7.95 ± 8.49	(2), (3), (4), (5)	26.85^b 8.18 ± 7.82	21.00^b 6.26 ± 5.17	6.92^a 14.78 ± 17.58	15.25^a 5.61 ± 4.87	22.63^b 9.47 ± 9.89	0	11.04^a 4.06^x ± 2.75	20.47^b 5.42^x ± 4.76	36.92^c 10.69^y ± 10.26
Chelonibia testudinaria²⁾	14.82 9.32 ± 9.96	(1)	45.64^b 9.68^y ± 0.3		2.31^a 1.33^x ± 0.58	13.98 10.03 ± 0.26	15.64 8.71 ± 9.64	4.41^a 2.67 ±1.70	13.64^b 7.57 ± 9.28	9.45^b 7.38 ± 6.71	26.92^c 11.46 ± 11.09
Semibalanus sp.	0.21/6	(3)	4.03 18.67 ± 16.90	0.50/6.00			0.41/6.00				0.77/6
Choniosphaera indica²⁾	2.09 20.90 ± 4.97	(1)		1.50 19.33 ± 7.36	0.77 39.00		4.12 20.9 ± 14.94		1.95 9.33 ± 6.02	1.57 21.00 ± 11.00	3.85 27.80 ± 15.82
Annelida
Hydroides sp.	0.21/4.00	(1)		0.50/4.00			0.41/4.00				0.77/4
Molusk
Electroma papilionacea	0.21/2.00	(1)		0.50/2.00			0.46/2.0				0.77/2
Unknown snail	0.21/2.00	(3), (5)	50.34^b 35.61 ± 52.13	0.50/2.00			0.46/2.0				0.77/2
Nemertea
Carcinonemertes mitsukurii¹⁾	39.67 34.68 ± 45.66	(5)	2.01/1.00	31.50^a 32.21 ± 37.86	40^b 36.35 ± 44.15	28.81^a 15.59^x ± 18.1	50.21^b 45.33^y ± 52.42	11.76^a 5.25^x ± 6.58	28.57^b 26.32^{x, y} ± 28.98	46.46^c 37.46^{x, y} ± 51.9	60.77^d 40.25^y ± 48.59
Platyhelminthes
Notoplana sp.²⁾	2.92 1.79 ± 1.15	(2), (5)	0.67/1.00	4.00 2.13 ± 1.27	2.31 1.67 ± 0.94	2.97 1.43 ± 0.73	2.88 2.14 ± 1.36		1.95^a/1.00	0.79^a/3.00	7.69^b 1.90 ± 1.22
Entoprocta
Loxosomella sp.²⁾	3.34 4.06 ± 2.61	(2), (5)	8.05 52.42 ± 54.01	5.00 4.4 ± 3.07	3.85 4 ± 0.89	1.69^a 4.75 ± 1.09	4.94^b 3.83 ± 2.91		3.25 2.00 ± 1.26	5.51 5.14 ± 3.04	3.08 4.75 ± 1.09
Ciliophora
Epistylis sp.²⁾	8.98 174.16 ± 406.2	(2), (4)	4.03 20.33^x ± 10.8	8.50 248.65 ± 479.7	10.77	7.63 363.72^y ± 575	10.29 37.68^x ± 41.02	1.47/40.00	11.04 278.06 ± 508.8	10.24 160.69 ± 418.65	9.23 52.75 ± 53.81
Zoothamnium sp.²⁾	3.76 69.61 ± 75.00	(2)	18.79^c 86.25 ± 186.1	4.50 94.11y ± 91.19	2.31 94.67^y ± 35.83	2.79 58.00 ± 60.21	4.53 77.00 ± 82.20		5.19 102.25 ± 84.94	4.72 55.00 ± 65.72	3.08 26.25 ± 4.75
Z. chlamydis¹⁾	10.86 96.56 ± 193.44	(2)	1.34 11.5 ± 4.50	11^b 116.27 ± 208.3	1.54^a 24.00 ± 16.00	9.32 66.95±87.10	12.35 118.27 ± 241.3	2.94^a/8.00	5.84^a 53.33 ± 91.71	9.45^a 127.58 ± 267.7	22.31^b 103.24 ± 182.39
Bryozoa
Triticella flavar	0.42 11.5 ± 4.50	(1)	0.42 11.5 ± 4.50			0.42/7.00	0.41/16.00		0.65/7.00		0.77/16
Anthozoa
Verrillactis paguri	0.21/5			0.50/5.00			0.46/5.00				0.77/5
Species number	18		13	16	12	12	18	5	13	12	18

Dominant species.
Common species.
Different letters mean prevalence and mean intensity was significantly different from geographical locations (north, central, and south) and sexes (male and female), and crab size groups (one-way ANOVA; p < 0.05). Infection sites were marked as (1) carapace, (2) limb, (3) abdomen, (4) mouth part, and (5) gill.