Open AccessEffects of feeding regimen of dietary Aspergillus oryzae on the growth performance, intestinal morphometry and blood profile of Nile tilapia ( Oreochromis niloticus )
Author(s) -
Dawood Mahmoud A. O.,
Eweedah Nabil M.,
Moustafa Moustafa Eman,
Shahin Mohamed G.
Publication year - 2019
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12923
Subject(s) - oreochromis , biology , nile tilapia , aspergillus oryzae , amylase , weight gain , digestive enzyme , zoology , transaminase , protease , tilapia , regimen , medicine , endocrinology , body weight , biochemistry , enzyme , fish <actinopterygii> , fishery
The current study was conducted to evaluate the feeding regimen of Aspergillus oryzae (ASP) on the growth, intestinal histomorphology and blood profile of Nile tilapia ( Oreochromis niloticus ). Four different ASP‐feeding regimens were evaluated, including feeding the basal diet continuously (control), feeding ASP (1 g/kg) continuously (ASPC), feeding ASP for 1 day and the next day without (ASPF1) or feeding ASP for 1 day and the two next days without (ASPF2). After 60 days, the final weight, weight gain, SGR, feed intake, protein efficiency, protein gain, body protein content, haematocrit, haemoglobin, and RBC and WBC values were increased significantly ( p < 0.05) with lower glutamic‐pyruvate transaminase in ASPC group compared to the control without no difference ( p > 0.05) with ASPF1‐feeding regimen. Interestingly, glutamyl oxaloacetic transaminase was significantly reduced in all feeding regimens compared to the control ( p < 0.05). Protease, lipase and villi length were significantly ( p < 0.05) improved in all feeding regimens compared to the control, while amylase activity increased only in ASPC group. Thus, the obtained results indicated that all ASP‐feeding regimens resulted in quite similar outcomes with respect to growth, digestive enzyme activity and intestinal histomorphology.