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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

From: Tuna by-product meal as a dietary protein source replacing fishmeal in juvenile Korean rockfish Sebastes schlegeli

  Diets
Con TBM25 TBM50 TBM75 TBM100
Initial mean weight (g/fish) 29.5 ± 0.3ns 29.3 ± 0.5 29.2 ± 0.4 29.6 ± 0.4 29.5 ± 0.2
Survival (%) 98 ± 1.1ns 93 ± 3.3 99 ± 1.1 98 ± 1.1 96 ± 4.4
Mean weight gain (g/fish) 23.5 ± 0.8b 23.5 ± 0.5b 21.3 ± 0.6ab 22.2 ± 0.4ab 19.7 ± 1.3a
Specific growth rate (%/day)a 0.69 ± 0.02b 0.69 ± 0.01b 0.65 ± 0.01ab 0.66 ± 0.01ab 0.60 ± 0.03a
Feed efficiency (%)b 61 ± 1.4b 61 ± 1.1b 63 ± 1.1b 59 ± 1.6b 51 ± 2.0a
Protein efficiency ratioc 1.18 ± 0.03b 1.20 ± 0.02b 1.24 ± 0.02b 1.17 ± 0.03b 1.02 ± 0.04a
Daily feed intaked 1.08 ± 0.01ab 1.04 ± 0.02ab .99 ± 0.03a 1.07 ± 0.02ab 1.11 ± 0.04b
Incidence coste 3279 ± 76.7c 2965 ± 56.1b 2722 ± 48.5ab 2625 ± 73.1a 2819 ± 107.2ab
Profit indexf 3.72 ± 0.06a 4.33 ± 0.10b 4.86 ± 0.15bc 4.86 ± 0.09bc 5.25 ± 0.32c
  1. Values (mean ± SE of three replications) in each row that do not share a common superscript letter are significantly different (P < 0.05)
  2. a[ln(finalbody weight)–ln(initial body weight)] × 100/day
  3. bFish wet weight gain × 100/feed intake (dry matter)
  4. cFish wet weight gain/protein intake
  5. dFeed intake (or protein) × 100/((initial fish wt. + final fish wt. + dead fish wt.) × days fed/2)
  6. eCost of kilogram feed consumed/kg fish produced
  7. fValue of fish crop (8300 won/kg)/cost of feed consumed
  8. nsNot significant (P > 0.05)