A production method for insect feed comprises passing a gas stream containing carbon dioxide into an aqueous algae solution, harvesting the algae, and processing it to produce insect feed 5-8. The carbon dioxide may be captured from an industrial plant 1 such as a food processing plant. The gas stream may be cooled to a temperature less than or equal to 50 degrees centigrade before passing it into the solution; this may be done using a heat exchanger 3a/b, including a water-cooling coil, the water from the water-cooling coil may be used to heat the solution to temperature less than or equal to 28 degrees centigrade A system for producing algae is also claimed comprising a diversion valve to divert the gas stream, via a gas channel, from an industrial plant to a photobioreactor containing the aqueous algae solution. The photobioreactor may be a high-rate algal pond 4. The algae...

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