Seasonal variation of biochemical composition of Noah's ark shells (Arca noae L. 1758) in a Tunisian coastal lagoon in relation to its reproductive cycle and environmental conditions

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Table 3

Seasonal variation of nutritional quality indices of Arca noae from Bizerte lagoon.

	Oct-13	Nov-13	Dec-13	Jan-14	Feb-14	Mar-14	Apr-14	May-14	Jun-14	Jul-14	Aug-14	Sep-14
PUFA/SFA	1.06 ± 0.26^a	1.21 ± 0.44^a	1.51 ± 0.22^a	1.49 ± 0.39^a	1.24 ± 0.16^a	1.33 ± 0.23^a	1.80 ± 0.74^a	1.19 ± 9.76^a	0.82 ± 0.12^b	0.90 ± 0.19^b	0.88 ± 0.16^b	1.26 ± 0.20^a
n−3 PUFA	22.73 ± 4.44^ab	25.97 ± 4.50^a	28.14 ± 3.95^a	27.58 ± 4.05^a	26.32 ± 4.81^a	29.07 ± 4.04^a	30.60 ± 8.28^a	26.58 ± 4.51^a	22.50 ± 2.34^ab	21.54 ± 1.90^b	20.78 ± 3.03^b	22.92 ± 3.56^ab
n−6 PUFA	8.00 ± 0.99^a	6.35 ± 0.89^a	7.02 ± 1.45^a	7.86 ± 1.00^a	7.60 ± 0.91^a	7.55 ± 0.60^a	6.35 ± 0.87^a	6.85 ± 0.44^a	6.27 ± 0.54^a	8.19 ± 1.92^a	6.32 ± 0.77^a	9.31 ± 2.32^a
DHA/EPA	1.57 ± 0.22^a	1.06 ± 0.20^a	1.31 ± 0.19^a	1.55 ± 0.27^a	1.72 ± 0.63^a	1.79 ± 0.37^a	2.38 ± 0.70^b	1.39 ± 0.28^a	1.77 ± 0.33^a	2.16 ± 0.51^b	1.24 ± 0.18^a	1.72 ± 0.35^a
EPA + DHA	17.00 ± 3.44^ab	12.97 ± 4.58^a	14.00 ± 2.58^a	14.14 ± 2.86^a	17.47 ± 3.57^ab	18.04 ± 2.64^b	17.53 ± 3.71^b	18.39 ± 0.41^b	14.26 ± 2.03^a	12.98 ± 3.34^a	13.77 ± 2.27^a	15.64 ± 1.88^a
n−3/n−6	2.84 ± 0.42^b	4.08 ± 0.34^a	4.07 ± 0.54^a	3.57 ± 0.87^a	3.45 ± 0.51^a	3.84 ± 0.46^a	4.80 ± 1.01^a	3.87 ± 0.52^a	3.59 ± 0.31^a	2.77 ± 0.80^b	3.31 ± 0.42^a	2.59 ± 0.71^b
AI	0.91 ± 0.17^a	0.84 ± 0.43^a	0.61 ± 0.16^a	0.67 ± 0.31^a	0.89 ± 0.13^a	0.91 ± 0.18^a	0.75 ± 0.29^a	0.95 ± 0.39^a	1.35 ± 0.23^b	1.21 ± 0.18^b	1.04 ± 0.25^ab	0.91 ± 0.12^a
TI	0.44 ± 0.10^a	0.34 ± 0.15^a	0.26 ± 0.05^a	0.29 ± 0.13^a	0.35 ± 0.03^a	0.34 ± 0.06^a	0.28 ± 0.12^a	0.40 ± 0.13^a	0.54 ± 0.07^b	0.51 ± 0.07^b	0.48 ± 0.09^b	0.41 ± 0.05^a

Results were given as mean ± SD (n = 6). Different letters (a, b and ab) in the same row indicate significant differences (p < 0.05).

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