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High Protein and β-Carotene Yield of Dunaliella spp. Exposed to High Light Intensities and Nutrient Limitation
Samia K. Mikhail & Wagdy LabibNational Institute of Oceanography and Fisheries,Kayet Bey, Anfoshi, Alexandria, Egypt
This study was done to test some algae for the highest dry weight, protein, essential amino acids and carotene contents in order to use its dried form as a mixture with boiling soybean meal, to feed Oreochromus niloticus fry.
D. Bardawil (N.M, 15.43 & S.M, 13.04 µg ml-1)
D. Salina (N.M, 14.77 & S.M, 12.31 µg ml-1)
I- Total protein
Diurnally grown cells of D. salina had lower protein content than that of cells growing similarly but under continuous light in synthetic and natural media.
Under stress conditions transient response in the surviving population of Dunaliella spp., including rounding of the cells, decreased motility, change in colour from green to deep orange and cessation of cell division was observed.
Dunaliella spp. is a good source for the three EAA.
Effect of replacement of fish meal protein with boiled full fat soybean seeds with dried algae on growth performance, nutrient utilization and some blood parameters of Nile tilapia (Oreochromis niloticus)Raky F. Attalla1, Samia K. Mikhail2National Institute of Oceanography and Fisheries1: Inland water, Cairo, Egypt.2: Kayet Bey, Anfoshi, Alexandria, Egypt.
- 50% (soybean) + 50% FM
- 50% mixture + 50% FM
- 75% mixture + 25% FM
- 100% mixture
- 100% soybean
Results obtained are summarized as follows: