Table 9. Growth performance of Japanese eel in HBFT-AP for 12 weeks1)

Growth performance Diet
Mash (1–6 wk) EP (7–12 wk)
Initial fish No. 367 361
Final fish No. 361 357
Initial weight of total fish (g) 82,130 91,320
Final weight of total fish (g) 91,320 106,780
Initial average (n = 50) weight of total fish (g) 225.5 ± 20.7 249.7 ± 21.6
Final average (n = 50) weight of total fish (g) 249.7 ± 21.6 296.9 ± 24.3
Feed intake(g, DM) 30,199 36,026
WG (%)2) 11.20 16.93
FE (%)3) 30.45 42.91
SGR (%)4) 0.25 0.37
PER5) 0.55 0.86
DFI6) 0.57 0.58
Survival rate (%)7) 98.2 98.9
HBFT-AP, hybrid biofloc technology-aquaponics; Mash, commercial powdered feed; EP, extruded pellet.
Weight gain (%) = [final weight (g) – initial weight (g)] × 100/initial weight (g).
Feed efficiency (%) = [wet weight gain (g)/dry feed intake] × 100.
Specific growth rate (%) = [Ln final weight (g) – Ln initial weight (g)] / experimental days × 100.
Protein efficiency ratio = wet weight gain (g) / protein intake.
Daily feed intake (%/av. wt/d) = dry feed intake (g/fish) / [(initial wt + final wt + dead fish wt) / 2] / experimental days × 100.
Survival rate (%) = final fish number / initial fish number × 100.
WG, weight gain; FE, feed efficiency; SGR, specific growth rate.