Ren and colleagues tested a crayfish by-product protein hydrolysate in an eight-week study with 360 juvenile whiteleg shrimp and four replicate tanks per diet. A 10% fishmeal diet supplemented with 2% hydrolysate improved feed intake, final weight and FCR compared with the unsupplemented low-fishmeal diet. Survival did not differ significantly.
Changes in feeding-related gene expression and microbiota richness accompanied the feeding response, without establishing causality or disease protection. Only one hydrolysate inclusion level was tested, so the experiment did not establish an optimal dose.
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