Relative contribution of natural diet

Treatments
Parameter	Shrimp pond	NF	FF	FF+NF	FF+NF+S
Mean final weight (mg)	276 ± 80^a,b	243 ± 40^a	271 ± 138^a,b	275 ± 103^a,b	317 ± 67^b
SGR (% d^-1)	12-17(15)	12-15(14)	8-19(15)	11-18(15)	14-18(16)
Survival rate (%)	85.7 ± 3^a	95.0 ± 2^b	93.3 ± 2^b	97.8 ± 1^c	95.3 ± 3^b,c
FCR	0.8-1.0	—	1.3-1.7	0.7-0.8	0.7-0.8
k (d^-1)	0.15 ± 0.03^a	0.14 ± 0.02^a	0.14 ± 0.05^a	0.15 ± 0.04^a	0.16 ± 0.02^a
m (d^-1)	0.02 ± 0.01^a	0.017 ± 0.01^a	0.02 ± 0.01^a	0.02 ± 0.01^a	0.024 ± 0.01^a
t50 (d)	3.4-5.2(4.0)	4.0-5.0(4.4)	2.6-7.4(4.1)	1.3-5.8(4.0)	3.3-4.3(3.7)
δ¹⁵N (‰)	8.52 ± 1.03	12.0 ± 0.32	8.48 ± 0.10	8.32 ± 0.56	8.19 ± 0.41
Relative contribution (%)	52-78(66)	100	—	18-74(55)	25-62(56)

Different superscripts indicate significant differences (a<b<c).

Table 3: Mean final weight, specific growth rate (SGR) and growth parameters (m and k), survival, feed conversion ration (FCR) and natural stable isotope value (δ¹⁵N) for postlarvaes (initial weight 51.7 ± 7 mg and δ¹⁵N=11.12 ± 0.26‰) and estimated N half time (t50) in tissue of shrimp L. vannamei reared for 11-days with formulated feed (FF, Crumble 40%), natural feed (NF) and 50:50 formulated+natural feeds as plankton (FF+NF, mixing plankton δ¹⁵N=9.80 ± 0.76‰) and plankton+benthos (FF+NF+S, δ¹⁵N=4.83 ± 0.57‰) (Trial 1). Relative contribution of natural diet to the growth of specimens reared on FF+NF and FF+NF+S treatments. Isotopic trophic enrichment (Δ¹⁵N=δ¹⁵N,_shrimp – δ¹⁵N_{NF or FF}) was estimated in 2.2‰ for NF and 2.03‰ for FF.

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