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Fishician®

How to read a fish food label

Fish food gets picked from the front of the pack. The useful information is on the label, along with what it can't tell you.

2 min readUpdated September 25, 2026

About this guide

Feeding

By Fishician

Published September 12, 2026

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The short answer

  • Start with your fish. Write down what each species eats and where it feeds before comparing tubs.
  • Ingredients are in weight order. The first few matter most. Ingredient names alone do not establish digestibility or nutritional suitability.
  • The analysis is a range. "Crude" is the lab method, not quality, and the numbers are minimums or maximums.
  • Size and sinking decide who eats. Often more useful than the protein percentage.
  • Use ordinary feeding directions as a starting point. Adjust ordinary portions to the species and observed intake; follow medicated-food directions exactly.
Several fish-food containers with their package labels visible
Examples of fish-food packaging. These older package fronts are illustrative; check the current ingredients and analysis on the product in hand.Photo: Latas de alimentos para peces 001 — Veronidae · CC BY-SA 3.0. Resized for display.
Reading a label in three passes
Read first
  • First few ingredients
  • Pellet or particle size
  • Floats or sinks
  • Manufacture or expiry date
Compare carefully
  • Only similar formats
  • Frozen and gel foods hold far more water
  • Or convert to dry-matter basis
Adjust from
  • Who actually gets food
  • Body condition
  • Leftovers
  • Water test results

Match food to feeding style

  • A mixed tank usually needs more than one food.
  • Choose food each fish can reach and eat; remove uneaten pellets before they break down.
  • Too-large food goes uneaten; too-fine food drifts into the filter.
  • For a carnivore, a grain or filler as the first ingredient deserves a closer look.

Digestibility matters

  • Two foods with similar numbers can digest differently.
  • What isn't digested becomes waste your filter has to handle. See feeding and nutrition.

Storage and special foods

  • Heat, light, moisture and time degrade nutrients. A tub stored above a lit tank isn't the food on the label.
  • Buy a size you'll finish, keep it sealed and cool, and keep wet fingers and scoops out.
  • Medicated or supplemented foods: follow the exact amounts and duration on the label.

Guaranteed analysis terms

  • Crude protein, fat, fibre, moisture and sometimes ash, stated as minimums or maximums.
  • They tell you the food's broad category, not whether a species will thrive on it.
  • Frozen and gel foods carry much more water, so compare them only after converting to a dry-matter basis.
  • Feeding directions can't know your stocking, temperature or life stages. Use them as a starting reference.

Sources

Each source is listed with the part of this guide it supports.