Abstract
This study evaluated the effects of replacing fish meal (FM) with Clostridium autoethanogenum protein (CAP) on growth and flesh quality of Pacific white shrimp, Litopenaeus vannamei. A control diet was designed to contain 560 g/kg FM, then 0%, 15%, 30%, 45%, 70% and 100% of dietary FM was replaced by CAP, referring to Con, CAP-15, CAP-30, CAP-45, CAP-70 and CAP-100, respectively. The six isoproteic and isolipidic diets were fed to shrimp (2.78 g) for 8 weeks. The increasing dietary CAP level negatively affected feed intake, weight gain and feed conversion ratio (P < 0.05). A negative linear tend was found between dietary CAP level and body surface redness, yellowness and flesh total collagen contents, n-3/n-6 PUFAs value and free flavor amino acids contents (P < 0.05). Both linear and quadratic trends were detected between flesh hardness, shear force, steaming loss, cooking loss and dietary CAP level (P < 0.05). In CAP-15 and CAP-30 groups, the above indexes presented the similar levels to the Con group (P > 0.05). Metabonomics analysis showed that the high replacement of FM with CAP affected the amino acids and fatty acids metabolism in flesh. In conclusion, in a basal diet containing 560 g/kg FM, 30% dietary FM could be successfully replaced by CAP, while higher FM substitution decreased the growth and flesh quality of L. vannamei.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have