Ecological intensification in multi-trophic aquaculture ponds: an experimental approach

Open Access

Table 3

Means of biometric indicators calculated from individual measurements for each treatment.

		Extensive		Semi-intensive		Coupled

Indicator		Mean	N¹	Mean	N¹	Mean	N¹	RSE²	Significance³
Weight at stocking (g)	Carp adult	128	50	130	50	114	50	45	NS
Weight at stocking (g)	Roach adult	77	21	71	20	61	20	21	NS
K⁴ at fish stocking	Carp adult	2.72	50	2.61	50	2.57	50	0.42	NS
K⁴ at fish stocking	Roach adult	1.78	21	1.69	20	1.65	20	0.16	NS
Weight at harvest (g)	Carp adult	199^b	215	655^a	168	616^a	188	185	^**
	Roach adult	68^b	61	99^a	51	75^a	5	25	^**
	Tench adult	30^a	20	67^b	38	42^a	22	19	^**
	Carp fry	11.2^a	42	8.9^a	33	57.4	49	27.9	^**
	S1⁵ roach fry	3.3^a	76	4.1^a	92	6.6^b	264	2.7	^**
	S2⁵ roach fry	1.3^a	64	1.6^a	140	1.0^b	75	0.7	^**
K⁴ at harvest	Carp adult	2.73^a	215	2.87^ab	168	3.22^b	188	2.03	^*
	Roach adult	1.38^b	61	1.66^a	51	1.66^a	5	0.20	^**
	Tench adult	1.44	20	1.48	38	1.53	22	0.13	NS
	Carp fry	2.61^a	42	2.53^a	33	2.99^b	49	0.52	^**
	S1⁵ roach fry	1.19	76	1.42	92	1.33	264	0.67	NS
	S2⁵ roach fry	1.20	64	1.19	140	1.11	75	0.25	NS

Number of individuals sampled to calculate values.

Residual standard error.

Significance levels: **P <0.01, *P <0.05. Same letters in each column indicate no significant differences at the P <0.05 level.

⁴

K corresponds to the Fulton’s condition factor and is calculated as , where W_i is individual live weight (g), and L_i is individual length at the caudal fork (cm).

⁵

S1 indicates the first spawning period and S2 indicates the second spawning period.

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