← Fish H30-04 · Module 4 of 7 · Pages: 17 · Worksheets: 4

Feeding and water quality

Natural food and grain feeding, how much to feed by temperature, oxygen at dawn, lime and manure without overdoing it, water testing and when to call the vet

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Feeding and water quality

In short

  • Fish don't feed below roughly 10 °C (50 °F). Light feeding from April, full feeding from May to September, and light again in October.
  • Daily roughly 1–4 % of fish weight in grain, according to water temperature. What isn't eaten in 2 hours is too much.
  • For 1 kg of carp growth roughly 3–4 kg of grain alongside natural food.
  • Oxygen is lowest at dawn. Fish gulping air at the surface at first light: fresh water or the aerator at once, and no feed that day.
  • Water transparency of 30–60 cm (Secchi disc) is good. Below 25 cm a night-time oxygen shortage threatens.
  • Several dead fish, sores, bleeding, fish swimming on their side: call the vet. No antibiotics on your own.

What's inside

Chapters

  1. Natural food: the chain in the water
  2. Oxygen: day and night
  3. Temperature and how much to feed
  4. Grain and pellets
  5. Lime and manure
  6. Water testing
  7. Summer and winter
  8. Fish health: when to call the vet
  9. Common mistakes
  10. Printable checklist

Worksheets

  • Feed calculator
  • Lime and manure calculator
  • Feeding and water log
  • Feeding and water calendar

Fields and checkboxes can be filled in with Adobe Acrobat Reader (desktop and mobile), and the calculator adds up by itself. Filling in may not work in some browsers. A print version comes with the screen PDF.

This guide in other languages:

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