Treatments

Parameter

Shrimp pond

NF

FF

FF+NF

FF+NF+S

Mean final weight (mg)

276 ± 80a,b

243 ± 40a

271 ± 138a,b

275 ± 103a,b

317 ± 67b

SGR (% d-1)

12-17(15)

12-15(14)

8-19(15)

11-18(15)

14-18(16)

Survival rate (%)

85.7 ± 3a

95.0 ± 2b

93.3 ± 2b

97.8 ± 1c

95.3 ± 3b,c

FCR

0.8-1.0

1.3-1.7

0.7-0.8

0.7-0.8

k (d-1)

0.15 ± 0.03a

0.14 ± 0.02a

0.14 ± 0.05a

0.15 ± 0.04a

0.16 ± 0.02a

m (d-1)

0.02 ± 0.01a

0.017 ± 0.01a

0.02 ± 0.01a

0.02 ± 0.01a

0.024 ± 0.01a

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 – δ15NNF or FF) was estimated in 2.2‰ for NF and 2.03‰ for FF.
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