Table 5 Growth performance and cost-benefit analyses of juvenile Korean rockfish fed diets containing various levels of tuna by-product meal for 12 weeks

Initial mean weight (g/fish)

29.5 ± 0.3^ns

29.3 ± 0.5

29.2 ± 0.4

29.6 ± 0.4

29.5 ± 0.2

Survival (%)

98 ± 1.1^ns

93 ± 3.3

99 ± 1.1

98 ± 1.1

96 ± 4.4

Mean weight gain (g/fish)

23.5 ± 0.8^b

23.5 ± 0.5^b

21.3 ± 0.6^ab

22.2 ± 0.4^ab

19.7 ± 1.3^a

Specific growth rate (%/day)^a

0.69 ± 0.02^b

0.69 ± 0.01^b

0.65 ± 0.01^ab

0.66 ± 0.01^ab

0.60 ± 0.03^a

Feed efficiency (%)^b

61 ± 1.4^b

61 ± 1.1^b

63 ± 1.1^b

59 ± 1.6^b

51 ± 2.0^a

Protein efficiency ratio^c

1.18 ± 0.03^b

1.20 ± 0.02^b

1.24 ± 0.02^b

1.17 ± 0.03^b

1.02 ± 0.04^a

Daily feed intake^d

1.08 ± 0.01^ab

1.04 ± 0.02^ab

.99 ± 0.03^a

1.07 ± 0.02^ab

1.11 ± 0.04^b

Incidence cost^e

3279 ± 76.7^c

2965 ± 56.1^b

2722 ± 48.5^ab

2625 ± 73.1^a

2819 ± 107.2^ab

Profit index^f

3.72 ± 0.06^a

4.33 ± 0.10^b

4.86 ± 0.15^bc

4.86 ± 0.09^bc

5.25 ± 0.32^c