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Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia

Afaf sawei , Nevin ibrahim, Dalia Abdou, Fawzia Abd El Ghafar, Mohamed Abouzeid.

Abstract
In aquaculture, Aflatoxins are the most recorded between all mycotoxins. It seems to be particularly prone to deposition in several fish tissues representing a risk for human consumption. Aspergillus flavus is the major producer of aflatoxin that commonly contaminates food and feed all over the world. A total of 57 finished fish feed samples were collected from feed factories in Cairo, Dakahlia and Kafr El Sheikh governorates, Egypt. Twenty nine fungal isolates belonging to four species were recovered from the collected feedstock. A. flavus was the most frequently isolated species (29.82%) compared with the other fungal species which include: A. parasiticus (12.28%), F. oxysporum (7.01%) and F. sporotrichioides (1.75%).Mycotoxin profile was determined using high performance liquid chromatography, Aflatoxins were detected in the culture filtrate of only 4 isolates of A. flavus out of the 17 examined these four isolates were deposited under the strain codes: AUMC 13909, AUMC 13910, AUMC 13911 and AUMC 13917. A. flavus strain AUMC13917 can produce both aflatoxins B1 (1.016 g /L) and B2 (0.314 g /L). while, the remaining three isolates AUMC13909, AUMC 13910 & AUMC 13911 were able to produce only aflatoxin B1 (8.082 g/L, 1.617 g/L & 0.141g/L, respectively). Naturally occurring aflatoxin B1 was also detected in 4 samples of fish feed and a single sample was contaminated with aflatoxin B2. Aflatoxin B1 was the prevalent mycotoxin within the collected feed samples, which is the most toxic aflatoxin chemotype. Yield of this aflatoxin differed between A. flavus strains and concentrations ranged from 0.106 to 11.546 mg/kg. The levels of aflatoxin detected in this study point to possible potential risks to fish health, performance and to aquaculture future investment.

Key words: Aflatoxin B, Aspergillus flavus, Chromatographic analyses, Fish feed farming


 
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How to Cite this Article
Pubmed Style

As, ibrahim N, Abdou D, Ghafar FAE, Abouzeid M, . Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. Egypt. J. Exp. Biol. (Bot.). 2019; 15(2): 157-166. doi:10.5455/egyjebb.20190624023039


Web Style

As, ibrahim N, Abdou D, Ghafar FAE, Abouzeid M, . Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. http://www.egyseb.net/?mno=54003 [Access: October 20, 2019]. doi:10.5455/egyjebb.20190624023039


AMA (American Medical Association) Style

As, ibrahim N, Abdou D, Ghafar FAE, Abouzeid M, . Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. Egypt. J. Exp. Biol. (Bot.). 2019; 15(2): 157-166. doi:10.5455/egyjebb.20190624023039



Vancouver/ICMJE Style

As, ibrahim N, Abdou D, Ghafar FAE, Abouzeid M, . Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. Egypt. J. Exp. Biol. (Bot.). (2019), [cited October 20, 2019]; 15(2): 157-166. doi:10.5455/egyjebb.20190624023039



Harvard Style

, A. s., ibrahim, N., Abdou, D., Ghafar, F. A. E., Abouzeid, M. & (2019) Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. Egypt. J. Exp. Biol. (Bot.), 15 (2), 157-166. doi:10.5455/egyjebb.20190624023039



Turabian Style

, Afaf sawei, Nevin ibrahim, Dalia Abdou, Fawzia Abd El Ghafar, Mohamed Abouzeid, and . 2019. Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Botany), 15 (2), 157-166. doi:10.5455/egyjebb.20190624023039



Chicago Style

, Afaf sawei, Nevin ibrahim, Dalia Abdou, Fawzia Abd El Ghafar, Mohamed Abouzeid, and . "Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia." THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Botany) 15 (2019), 157-166. doi:10.5455/egyjebb.20190624023039



MLA (The Modern Language Association) Style

, Afaf sawei, Nevin ibrahim, Dalia Abdou, Fawzia Abd El Ghafar, Mohamed Abouzeid, and . "Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia." THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Botany) 15.2 (2019), 157-166. Print. doi:10.5455/egyjebb.20190624023039



APA (American Psychological Association) Style

, A. s., ibrahim, N., Abdou, D., Ghafar, F. A. E., Abouzeid, M. & (2019) Aspergilli and aflatoxin B in finished feed for farmed Nile tilapia. THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Botany), 15 (2), 157-166. doi:10.5455/egyjebb.20190624023039