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Nutrition of red drum, Sciaenops ocellatus L.: An additional evaluation of the effects of soya‐based diets and supplemental prebiotic
Author(s) -
Rossi Waldemar,
Ju Min,
Hume Michael E.,
Tomasso Joseph R.,
Gatlin Delbert M.
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13334
Subject(s) - prebiotic , biology , food science , soy protein , meal , fish meal , soybean meal , soya bean , zoology , fish <actinopterygii> , fishery , ecology , raw material
We assessed the effects of a fishmeal ( FM )‐ and two soya‐based diets [without or with prebiotic (GroBiotic ® ‐A; GBA ) supplementation] on the production performance, non‐specific immunity, blood parameters and gut microbiota diversity of red drum, Sciaenops ocellatus . All diets were formulated to contain 450 g/kg crude protein ( CP ) and 120 g/kg lipid. A combination of soya bean meal and soya protein concentrate ( SP ) was used to replace 88% of the FM in the FM ‐based diet ( REF ) originating the first soya‐based diet ( SOY ). The second soya‐based diet ( SOY  +  GBA ) was designed identically to SOY except for the supplementation of GBA (20 g/kg) substituting for wheat flour. After feeding the experimental diets to triplicate groups of 25 (~3.4 g/fish) and 90 (~4.1 g/fish) red drum juveniles for 9 (Trial I) and 16 weeks (Trial II ), our results showed that (i) red drum was highly sensitive to the soya‐based diets in the first week of feeding; (ii) replacing 88% of FM with SP reduced the production performance of red drum without affecting intestinal micromorphology; (iii) whole‐blood leucocyte oxidative radical production was unaffected while lower haematocrit and higher plasma lysozyme activity were found in fish fed REF ; (iv) plasma osmolality was unaffected while lower glucose and higher lactate levels were observed in fish fed SOY and SOY  +  GBA ; (v) 16S rRNA gene‐based diversity of fish gut microbiota was affected both by SP and by GBA . This study expands the information on red drum responses to soya‐based diets and prebiotic supplementation.

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