<abstract xmlns="http://www.w3.org/1999/xhtml"><p><italic>Azolla</italic> meal was included in fish feed at different levels (10%, 20%, and 30%) and was fed to genetically-improved farmed tilapia (GIFT) for 90 days. The obtained results demonstrated that the final body weight, weight gain, and specific growth rate decreased significantly in fish fed 30% <italic>Azolla</italic> (P&lt;0.05), while tilapia fed 10% and 20% did not differ significantly from those of the control (P>0.05). However, the feed conversion ratio increased significantly in fish fed 30% <italic>Azolla</italic> (P&lt;0.05), while tilapia fed 10% and 20% did not differ significantly from those of the control (P>0.05). The body proximate analysis, amylase, lipase, protease, blood phagocytic index, and phagocytic and lysozyme activity were not affected by the inclusion of <italic>Azolla</italic> in tilapia diets and remained similar to those of the control group (P>0.05). The villus length of the foregut was not significantly affected by <italic>Azolla</italic> inclusion in tilapia diets (P>0.05). In the midgut, the villus length significantly (P&lt;0.05) increased in fish fed <italic>Azolla</italic> at 20% and 30% compared to the control, with no differences from those fed at 10% (P>0.05). The villus length significantly (P&lt;0.05) increased in the hind gut in fish fed <italic>Azolla</italic> at 30 % compared to the control, with no differences from those fed at 10% and 20% (P>0.05). The mucosal length of the tilapia foregut significantly (P&lt;0.05) increased in fish fed <italic>Azolla</italic> at 10% compared to the control, with no differences from those fed at 20% and 30% (P>0.05). In the foregut and hindgut, the number of goblet cells significantly increased in fish fed <italic>Azolla</italic> at 3% compared to the control, with no differences from those fed at 10% and 20% (P>0.05), while in the midgut, the number of goblet cells significantly (P&lt;0.05) increased in fish fed <italic>Azolla</italic> at 20% and 30% compared to the control, with no differences from those fed at 10% (P>0.05). Feeding tilapia with <italic>Azolla</italic> resulted in normal hematological and biochemical functions, with insignificant differences for the measured parameters except for the red blood cell count, which significantly (P&lt;0.05) increased in fish fed <italic>Azolla</italic> at 20% compared to the control, with no differences from those fed at 20% and 30%.</p></abstract>

Azolla meal was included in fish feed at different levels (10%, 20%, and 30%) and was fed to genetically-improved farmed tilapia (GIFT) for 90 days. The obtained results demonstrated that the final body weight, weight gain, and specific growth rate decreased significantly in fish fed 30% Azolla (P<0.05), while tilapia fed 10% and 20% did not differ significantly from those of the control (P>0.05). However, the feed conversion ratio increased significantly in fish fed 30% Azolla (P<0.05), while tilapia fed 10% and 20% did not differ significantly from those of the control (P>0.05). The body proximate analysis, amylase, lipase, protease, blood phagocytic index, and phagocytic and lysozyme activity were not affected by the inclusion of Azolla in tilapia diets and remained similar to those of the control group (P>0.05). The villus length of the foregut was not significantly affected by Azolla inclusion in tilapia diets (P>0.05). In the midgut, the villus length significantly (P<0.05) increased in fish fed Azolla at 20% and 30% compared to the control, with no differences from those fed at 10% (P>0.05). The villus length significantly (P<0.05) increased in the hind gut in fish fed Azolla at 30 % compared to the control, with no differences from those fed at 10% and 20% (P>0.05). The mucosal length of the tilapia foregut significantly (P<0.05) increased in fish fed Azolla at 10% compared to the control, with no differences from those fed at 20% and 30% (P>0.05). In the foregut and hindgut, the number of goblet cells significantly increased in fish fed Azolla at 3% compared to the control, with no differences from those fed at 10% and 20% (P>0.05), while in the midgut, the number of goblet cells significantly (P<0.05) increased in fish fed Azolla at 20% and 30% compared to the control, with no differences from those fed at 10% (P>0.05). Feeding tilapia with Azolla resulted in normal hematological and biochemical functions, with insignificant differences for the measured parameters except for the red blood cell count, which significantly (P<0.05) increased in fish fed Azolla at 20% compared to the control, with no differences from those fed at 20% and 30%.

The Effects of Fish Feed Supplemented with <italic>Azolla</italic> Meal on the Growth Performance, Digestive Enzyme Activity, and Health Condition of Genetically-Improved Farmed Tilapia (<italic>Oreochromis niloticus</italic>)

Department of Animal Production, Faculty of Agriculture

Central Laboratory for Aquaculture Research

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Effects of Fish Feed Supplemented with  Meal on the Growth Performance, Digestive Enzyme Activity, and Health Condition of Genetically-Improved Farmed Tilapia ()

Azolla meal was included in fish feed at different levels (10%, 20%, and 30%) and was fed to genetically-improved farmed tilapia (GIFT) for 90 days. The obtained results demonstrated that the final body weight, weight gain, and specific growth rate decreased significantly in fish fed 30% Azolla (P0.05). However, the feed conversion ratio increased significantly in fish fed 30% Azolla (P0.05). The body proximate analysis, amylase, lipase, protease, blood phagocytic index, and phagocytic and lysozyme activity were not affected by the inclusion of Azolla in tilapia diets and remained similar to those of the control group (P>0.05). The villus length of the foregut was not significantly affected by Azolla inclusion in tilapia diets (P>0.05). In the midgut, the villus length significantly (P0.05). The villus length significantly (P0.05). The mucosal length of the tilapia foregut significantly (P0.05). In the foregut and hindgut, the number of goblet cells significantly increased in fish fed Azolla at 3% compared to the control, with no differences from those fed at 10% and 20% (P>0.05), while in the midgut, the number of goblet cells significantly (P0.05). Feeding tilapia with Azolla resulted in normal hematological and biochemical functions, with insignificant differences for the measured parameters except for the red blood cell count, which significantly (P<0.05) increased in fish fed Azolla at 20% compared to the control, with no differences from those fed at 20% and 30%.

Azolla meal was included in fish feed at different levels (10%, 20%, and 30%) and was fed to genetically-improved farmed tilapia (GIFT) for 90 days. The...

The Effects of Fish Feed Supplemented with Azolla Meal on the Growth Performance, Digestive Enzyme Activity, and Health Condition of Genetically-Improved Farmed Tilapia (Oreochromis niloticus)

Published Online: Aug 01, 2020

Page range: 1029 - 1045

Received: Nov 15, 2019

Accepted: Jan 14, 2020

DOI: https://doi.org/10.2478/aoas-2020-0016

Keywords
meal, digestive enzyme activity, genetically-improved farmed tilapia, intestinal morphometry, immune response

© 2020 Fawzy I. Magouz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Effects of Fish Feed Supplemented with Azolla Meal on the Growth Performance, Digestive Enzyme Activity, and Health Condition of Genetically-Improved Farmed Tilapia (Oreochromis niloticus)

Published Online: Aug 01, 2020

Page range: 1029 - 1045

Received: Nov 15, 2019

Accepted: Jan 14, 2020

DOI: https://doi.org/10.2478/aoas-2020-0016

Keywordsmeal, digestive enzyme activity, genetically-improved farmed tilapia, intestinal morphometry, immune response

© 2020 Fawzy I. Magouz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
meal, digestive enzyme activity, genetically-improved farmed tilapia, intestinal morphometry, immune response