TABLE 2.

Prevalence and intensity of C. molnari in gilthead sea bream groups surveyed in ongrowing systems in study A

System and farm	Previous origin		Sample no.	Sample date	nb	Fish weight (g)	Prevalence (%)	MIc
	Hatchery	Preongrowing
Sea cages
F1	H-3	H-3	1a	Mar 1999	19	21.2 ± 4.7	0	0
			2	Jul 1999	20	92.3 ± 12.9	55	4
			3	Oct 1999	28	222.8 ± 35.0	3.6	1
			4	Feb 2000	20	313.5 ± 53.3	0	0
			5	Jul 2000	19	339.7 ± 50.1	0	0
F2	H-1	PGF1	1a	Apr 1999	31	8.4 ± 7.2	3.2	2
			2	Jul 1999	16	41.0 ± 16.1	31.7	1.5
			3	Oct 1999	20	110.3 ± 19.5	0	0
			4	Jan 2000	20	142.3 ± 31.1	0	0
			5	Apr 2000	20	176.6 ± 38.6	0	0
			6	Jul 2000	17	281.3 ± 48.3	0	0
Total					230		6.5	3.3
Earth ponds, F6	H-2 and H-3	H-2 and H-3	1a	June 1999	22	2.1 ± 0.9	0	0
			2	Sept 1999	34	59.4 ± 12.9	0	0
			3	Dec 1999	39	119.2 ± 24.7	5	1.5
			4	Apr 2000	20	143.0 ± 31.9	10	1
			5	Jul 2000	20	201.8 ± 7.3	0	0
			6	Oct 2000	22	414.0 ± 76.5	0	0
Total					157		2.5	1.25
Indoor tanks
IATS-1	H-3	H-3	1a	Mar 1999	19	21.2 ± 4.7	0	0
			2	June 1999	41	72.6 ± 16.3	0	0
			3	Sept 1999	35	266.1 ± 59.1	0	0
IATS-2	H-3	H-3	1	Jun 1999	20	9.1 ± 2.1	0	0
			2	Sept 1999	38	85.0 ± 16.3	0	0
			3	Dec 1999	34	157.3 ± 27.5	0	0
			4	Apr 2000	38	199.8 ± 44.1	42.1	4
			5	Jul 2000	30	349.3 ± 54.1	10	4
Total					244		7.8	4

^aSampling carried out before introduction in the ongrowing system.

^bn, number of fish examined.

^cMI, mean intensity of infection.