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Modified Wednesday, December 22, 2004

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1998 feed trial comparing BioKyowa-C to BioDiet Dry

Due to the high cost of the BioKyowa diet we are still searching for a cheaper alternative without compromising fish health. The BioKyowa is $7.27/pound and the BioDiet Dry is $2.40/pound. On May 8, 1998 we began a six-month feed trial comparing BioKyowa-C to the BioDiet Dry 1000 on four lots of June sucker.

Feed comparisons:

  BioDiet Dry-1000 BioKyowa-C 1000
(Min) Crude protein 50.5% 55%
(Min) Crude fat 17.5% 10%
Crude fiber (Min) 2.0% (Max) 4.0%
Ash (Max) 12.0% 17.0%

Crippling for each lot before feed trial:

  94SKJNLot-8 94SKJNLot-6 94SKJNLot-4 94SKJNLot-11
Diet BioKyowa BioKyowa BioDiet BioDiet
Previous Diet Silver Cup BioKyowa Silver Cup BioKyowa
Daily growth six-month period .009" .011" .008" .012"
Fish/lb 10.22 4.89 8.08 4.66
Fish/lb after six months 5.37 2.53 4.34 2.59
Length 6.44" 8.08" 7.02" 8.33"
Length after six months 8.02" 9.99" 8.39" 10.46"
Condition factor .0003662 .0003873 .0003832 .0003874
C-Factor after six months .0003610 .0003961 .0003908 .0003375
Vertebral Defromity 42.54% 0.00% 2.61% 1.69%
Vertebral deformity after six months 45.45% 0.00% 3.25% 4.62%
Mouth deformity 2.76% 1.05% 7.38% 5.35%
Mouth deformity after six months 5.19% 1.27% 14.53% 3.47%
Cranial deformity 0.00% 1.05% .34% 1.41%
Cranial deformity after six months 0.00% 0.00% 9.18% 2.31%
Operculum deformity 75.69% 78.95% 92.28% 49.58%
Operculum deformity after six months 74.03% 35.17% 83.75% 52.02%
Fin deformity 84.53% 84.42% 94.67% 99.72%
Fin deformity after six months 97.40% 96.61% 73.04% 98.84%
Total deformity Index 2.11 1.65 2.01 1.67
Total deformity after six months 2.22 1.33 1.84 1.61

Notes: The lower the deformity index the fewer total deformities in that lot.

Each fish is checked for all deformities and 1 point is given for each deformity that fish has. The total deformity is the average index of all fish checked.

Results: It looks like the BioDiet could very well be our alternative to help us reduce feed cost without jeopardizing fish health. The overall deformity index on fish fed the BioDiet was -.23 compared to the BioKyowa at -.21. We will continue to evaluate the two diets for another 6 months, at which time the deformities will be checked again on all fish in each lot.