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. 2022 Apr 19;4(2):208–221. doi: 10.1007/s42995-022-00128-z

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Fig. 2 — Origin, preparation, and possible points of the application of enzymes, in the pathways of fish feed production. Numbers 1, 2 and 3 indicate possible points where enzymes can act to (1) pre-digest fish feed, (2) be mixed with the mash for pelleting after enzyme stabilization toward temperature and operational conditions for pelleting or (3) be mixed with fish feed pellets to function in the gastroenteric fish tract