Table 4.
Other biological inputs used in the stochastic bioeconomic model for grow-out in Asian seabass.
| Variable | Data | Sources |
|---|---|---|
| Percentage of gain in body weight attributed to feed | ||
| Before 2 months of age | 100% by pellet | [Farm survey, (32)] |
| Between 2 and 4 months of age | 80% by pellet; 20% by trash fish | [Farm survey, (32)] |
| After 4 months of age | 60% by pellet: 40% by trash fish | (32) |
| The feeding rate per day | ||
| Before fingerlings attain a body weight of 100 g | 3 | [Farm survey, (30, 33)] |
| After fingerlings attain a body weight of 100 g | 2 | Farm survey |
| The feed conversion ratio for trash fish (average)a | 1: 4 | (7, 30, 32) |
| Minimum–maximum | 3.53–4.16 | |
| The feed conversion ratio for pellet (average)a | 1:2 | (7, 31, 32) |
| Minimum–maximum | 1.73–2.96 | |
| Vibriosis | ||
| Prevalence of subclinical Vibrio spp. in hatcheriesa | 0.077 | (25) |
| Prevalence of clinical Vibrio spp. in hatcheriesa | 0.083 | (25) |
| Case fatality rate (minimum–maximum)a | 40% (0%−100%) | (25) |
| Body weight gain constants | ||
| K | 2.2495 | (28) |
| X | −0.327 | |
| Y | 0.015 | |
| Z | −0.000203 | |
| a | −0.01 | |
| b | 0.72 | |
| Body weight loss (Vibrio spp.) | 0.69% from body weight | (11) |
| Time taken to do activities | ||
| Cleaning net (seconds per tail) | 2.7 | Aquatic veterinarian |
| Feeding (seconds per tail) | 0.8 | Aquatic veterinarian |
| Grading (seconds per tail) | 1.8 | Aquatic veterinarian |
a
Modeled using Riskpert (minimum, most likely, and maximum number). An example of the case fatality rate is Riskpert (0, 0.40, 1).