Start / Livestock and aquaculture / Fish farming
See in how many days the fish reach harvest weight, based on the growth rate of your production.
Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.
Days to fish harvest weight for TCE of 0.8% to 2% per day, with the same weights; the highlighted bar is yours.
Time in days for TCE of 0.8% to 2% per day; the dot is your batch.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Days to fish harvest weight for TCE of 0.8% to 2% per day and different final weights, with the initial weight entered.
The calculation done in steps, with the values you entered.
The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.
Enter the fish's initial weight, the desired harvest weight, and the specific growth rate of your farm, in % per day. The calculator shows the days to fish harvest and the average daily gain.
Fish of 50 g, harvested at 600 g and TCE of 1.5% per day.
Days = ln(600 ÷ 50) ÷ 0.015 = ln(12) ÷ 0.015 = 2,485 ÷ 0.015 = 166 days. Average gain = (600 − 50) ÷ 166 = 3.3 g/day.
It is the daily growth percentage on a logarithmic scale. It allows comparing batches with different starting weights without distorting the calculation.
Because specific growth rate falls with weight and age. That is why daily gain in grams can be high while the rate is lower.
It varies a lot. Cold water slows growth and feeding. In cold seasons, the time to harvest can double.
Use the number of days to plan the date, labor and the slaughterhouse. Confirm with sample weighings before setting the date.
Important notice: the Agrocalcs tools make estimates and preliminary sizing based on the data entered and on published engineering methods. They do not replace a design, a calculation report or a report signed by a qualified professional (CREA/ART), nor verification against the applicable technical standards and legislation, such as the Regulatory Standards of the Ministry of Labor. Material and fuel properties vary: check with the manufacturer or with analyses of your process before deciding. By using the site, you agree to the Terms of Use.
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