Occurrence of Anisakis and Hysterothylacium nematodes in Atlantic chub mackerels from Libyan coasts

Prevalence parameter estimated according to seasons (autumn: September, October, November; winter: December, January, February; spring: March, April, May; summer: June, July, August) obtained for Atlantic chub mackerels infected by Anisakis spp_ and Hysterothylacium spp_ analysed in the present study (CI: confidence interval; P%: prevalence indicated as percentage; p: p value)_

	Anisakis spp.		Hysterothylacium spp.
	P%	CI	P%	CI
Autumn	37.80	27.8 – 48.6	24.40	16.0 – 34.6
Winter	17.80	10.5 – 27.3	33.30	23.7 – 44.1
Spring	50.00	39.3 – 60.7	63.30	52.5 – 73.2
Summer	62.20	51.4 – 72.2	54.40	43.6 – 65.0
p	< 0.00001		< 0.00001

Epizootiological parameters obtained for chub mackerels infected by Anisakis spp_ and Hysterothylacium spp_ analysed in the present study (CI: confidence interval; NIF: number of infected fish; P %: prevalence indicated as percentage; ml: mean intensity; mA: mean abundance; K: aggregation index)_

	NIF	P %	mI	mA	K
Anisakis spp.	151	41.9	5.76	2.42	0.2
(CI)		(36.8 – 47.2)	(4.32 – 8.55)	(1.78 – 3.68)
Hysterothylacium spp.	158	43.9	2.25	0.98	0.53
(CI)		(38.7 – 49.2)	(1.96 – 2.66)	(0.82 – 1.2)