ABDEL-HALIM, A., SHANAB, T., ABDEL-TAWWAB, M. (1998). EVALUATION OF AZOLLA PINNATA MEAL AS AN INGRE- DIENT IN DIETS FOR TILAPIA ZILLII FRY. Egyptian Journal of Agricultural Research, 76(3), 1307-1316. doi: 10.21608/ejar.1998.359110
ABDEL-RAHMAN M. M. ABDEL-HALIM; THANAA SHANAB; MOHSEN ABDEL-TAWWAB. "EVALUATION OF AZOLLA PINNATA MEAL AS AN INGRE- DIENT IN DIETS FOR TILAPIA ZILLII FRY". Egyptian Journal of Agricultural Research, 76, 3, 1998, 1307-1316. doi: 10.21608/ejar.1998.359110
ABDEL-HALIM, A., SHANAB, T., ABDEL-TAWWAB, M. (1998). 'EVALUATION OF AZOLLA PINNATA MEAL AS AN INGRE- DIENT IN DIETS FOR TILAPIA ZILLII FRY', Egyptian Journal of Agricultural Research, 76(3), pp. 1307-1316. doi: 10.21608/ejar.1998.359110
ABDEL-HALIM, A., SHANAB, T., ABDEL-TAWWAB, M. EVALUATION OF AZOLLA PINNATA MEAL AS AN INGRE- DIENT IN DIETS FOR TILAPIA ZILLII FRY. Egyptian Journal of Agricultural Research, 1998; 76(3): 1307-1316. doi: 10.21608/ejar.1998.359110
EVALUATION OF AZOLLA PINNATA MEAL AS AN INGRE- DIENT IN DIETS FOR TILAPIA ZILLII FRY
1Central Laboratory for Aquaculture, Agricultural Research Centre, Abbassa, Abu-Hammad, Sharkia, Egypt
2Faculty of Science, Cairo University, Giza, Egypt
Abstract
Duplicate groups of Tilapia zillii fry reared in ten aquaria were fed one of isonitrogenously five different diets for 90 days. Formulated control diet containing 20% crude protein was used. A whole part of the diet was replaced with either 0, 25, 50, 75 or 100% Azolla pinnata meal. Results showed growth retardation of the fish proportional to the increasing Azolla level in the diet. Mortality rate reached 23% for fish fed 100% Azolla meal. Carcass composition showed increased moisture and ash contents and poorer content of CP and EE. Values of feed conversion ratios were higher; PER, PPV% and EU% were lower with increasing Azolla level. Azolla is not nutritionally efficient for T.zillii fry at high inclusion levels. However, levels below 25% may be promising as an ingredient in fish feed in view of being costless protein source.