specific growth rate (SGR) and growth parameters

Parameter	Shrimp pond	NF	FF	FF+NF	FF+NF+S
Mean final weight (g)	17.60 ± 0.23^a	—	17.34 ± 1.32^a	17.19 ± 0.23^a	18.1 ± 0.84^a
SGR	1.8-3.9(3.0)	—	2.0-4.1(2.7)	2.0-3.2(2.9)	2.0-4.1(3.1)
Survival rate (%)	74 ± 2^a	—	93 ± 3^c	87 ± 5^b	90 ± 3^b,c
FCR	1.1-1.3	—	1.3-1.7	0.7-1.3	0.8-1.4
k (d^-1)	0.030 ± 0.00^a	—	0.029 ± 0.01^a	0.03 ± 0.00^a	0.031 ± 0.01^a
m(d^-1)	0.325 ± 0.01^a		0.318 ± 0.04^a	0.314 ± 0.01^a	0.34 ± 0.02^a
t₅₀ (d)	1.9-2.2(2.0)		1.8-2.3(2.0)	1.7-2.7(2.0)	1.8-2.0(1.9)
δ¹⁵N(‰)	8.42 ± 0.30	—	8.23 ± 0.17	7.91 ± 0.45	7.61 ± 0.81
δ¹⁵N(‰)	8.81 ± 0.33	—	8.52 ± 0.19	8.02 ± 0.50	7.56 ± 0.87
Relative contribution (%)	0	—	—	<10	9-16(13)

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

Table 6: Mean final weight, specific growth rate (SGR) and growth parameters (m and k), survival, feed conversion ration (FCR), natural stable isotope value (δ¹⁵N) and estimated N half time (t₅₀) in tissue of large (initial weight, 6.21 ± 0.72 g, δ¹⁵N=6.95 ± 0.34‰) L. vannamei reared for 35-days with formulated feed (FF, δ¹⁵N=5.8‰), natural feed (NF) and 50:50 formulated+natural feeds as plankton+bioflocs (FF, δ¹⁵NNF=6.7 ± 0.83‰) (FF+NF) and plankton+bioflocs+benthos (δ¹⁵N=6.81 ± 0.53‰) (FF+NF+S) (Trial 4). 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_FF) was estimated in 2.43‰ only for FF.

Goto home»