# What Should FCR Be for Rainbow Trout?

> Typical FCR range in Rainbow Trout farming, suitable water temperature, oxygen, harvest weight and production time. Calculate and improve your FCR.

- URL: https://demo.fcrsoft.com/en/fcr/trout-fcr
- Language: en
- Updated: 2026-10-03
- Publisher: FCRSOFT (https://fcrsoft.com)

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# What Should FCR Be for Rainbow Trout?

In commercial Rainbow Trout (Oncorhynchus mykiss) farming, economic FCR is usually in the 1.0–1.3 range. The value varies with water temperature, fish size, feed quality and feeding management.
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| Typical FCR range | 1.0–1.3 |

| Suitable water temperature | 9–17 °C |

| Minimum dissolved oxygen | 6 mg/L |

| pH range | 6.5–8.0 |

| Salinity | 0–3 ‰ |

| Typical harvest weight | 250–350 g |

| Production period | 9–12 months |

| Daily feeding rate | %1.5 |

Values are general references and may vary with your farm’s conditions.
Trout needs high oxygen; feed conversion deteriorates quickly when dissolved oxygen falls below 6 mg/L.

## Worked example

Producing 500 t of Rainbow Trout a year at an FCR of 1.15 requires about 575 t of feed. Lowering FCR to 1.05 saves about 50 t of feed.
[Free tool FCR Savings Calculator](https://demo.fcrsoft.com/en/tools/fcr-savings-calculator) **Track Your FCR Automatically**Instead of doing this by hand every month, let FCRSOFT calculate your FCR per cage automatically with every feeding and weighing record.
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## Factors that affect FCR in Rainbow Trout

- Species and genetics

- Water temperature and dissolved oxygen

- Fish size: smaller fish convert feed more efficiently

- Nutritional value, pellet size and digestibility of the feed

- Feeding frequency, amount and feed loss

- Stocking density, health and stress

[Free tool FCR Calculator](https://demo.fcrsoft.com/en/tools/fcr-calculator) FCRSOFT

## FCRSOFT does this for you automatically

You don’t need to do the calculations and checks on this page by hand every day. FCRSOFT derives them all automatically from the records entered in the field.

- FCR and biomass are updated per cage with every feeding and weighing record.

- FCR values above target are flagged in the panel.

- Economic and biological FCR reports are ready by batch and period.

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[Rainbow Trout in the species library — fcrsoft.com](https://fcrsoft.com/en/species/oncorhynchus-mykiss/)
Last updated: 10/3/2026

## Related tools and guides

[Free tool ### FCR Calculator Free FCR calculator: instantly work out economic and biological FCR, feed cost per kg and the savings from a 0.1 FCR improvement, from biomass gain and feed given. Open the tool](https://demo.fcrsoft.com/en/tools/fcr-calculator) [Guide ### What Should FCR Be in Fish? Typical FCR ranges for sea bass, sea bream, trout, salmon, tilapia, shrimp and carp; the factors that affect FCR and how to interpret your own value. Read the guide](https://demo.fcrsoft.com/en/fcr/what-should-fcr-be) [Guide ### How to Improve FCR Ways to lower FCR with feeding tables, temperature-based feeding, appetite monitoring, the right pellet size, grading, oxygen management, feed storage and data-driven tracking. Read the guide](https://demo.fcrsoft.com/en/fcr/how-to-improve-fcr) [Free tool ### Water Quality Checker Choose your species and enter temperature, dissolved oxygen, pH, ammonia, nitrite and salinity to see a good, caution or critical status for each parameter. Open the tool](https://demo.fcrsoft.com/en/tools/water-quality-checker)