Aims: This study focused on new fish feed additives that could supply a nutritional value and inhibit or eliminate mycotoxins. Four novel feed additives, including Albizia lebbeck (L.), Leucaena leucocephala leaf extracts, Serendipita indica and Bacillus megaterium were applied to contaminated fish feed; besides investigating the toxicity of these new fish feed additives. Methodology and results : Our data exhibited that the different tested feed additives were not toxic for brine shrimp larvae or fish. Albizia lebbeck extract at a concentration 0.5% was highly effective in detoxifying mycotoxins with efficacy ratios of 88.01%, 93.89% and 92.89% for aflaB1, aflaG1 and CPA, respectively and L. leucocephala at 0.5% had efficacy ratios of 93.52% and 100% for aflaG1 and CPA, respectively. The addition of S. indica with a concentration of 0.75% was highly effective for the usage of good feed approximately free of mycotoxins, with efficacy ratios of 85.65%, 90.81% and 100% for aflaB1, aflaG1 and CPA, respectively. Moreover, B. megaterium, with a concentration of 0.75% was recommended for detoxification. Conclusion, significance and impact of study Studied new feed additives as feed additives in fish diets to eliminate mycotoxin with the potential of providing antioxidant activity. Results suggest that mycotoxins degradation can happen in vitro and in vivo by applying new fish feed additives in the fish diet.

Aims: Potatoes are considered one of the most strategic vegetable crops all over the world. Alternaria alternata has recently contaminated certain potatoes farms in different regions in Egypt. Among thirteen samples from fifteen regions were studied in a precedent study. Our study was aimed to investigate the effect of Bacillus thuringiensis subsp. Kurosaki suspension on inhibiting the growth of the three tested isolates of A. alternata and minimizing their mycotoxins production in vitro using three isolates with three levels of highly, moderate and low pathogenicity with unequal amounts of dual mycotoxins production. Methodology and results: Three isolates of A. alternata from three regions, Kom Hamada (KH3), Alamin (Alam1) and Nobaria (NO3), which were determined as a producer of tenuazonic acid (TeA) and alternariol monomethyl ether (AME) toxins. Bacillus thuringiensis (Bt) use as commercial fungicide was applied with three suspension concentrations (75, 150 and 300 μg/mL) as inhibitor for the two mycotoxins. Our results illustrated that the three tested isolates recorded high TeA and AME inhibition efficacies by increasing the Bt suspension concentration. The highest inhibitory concentration of Bt was at concentration 75 μg/mL for isolated from Nobaria third region (NO3) and Alam1 it was (99.83 and 99.74%) for mycotoxin (AME) while, TeA mycotoxin had the most inhibition percentage (99.58%) at concentration 150 μg/mL for the isolate (NO3). Conclusion, significance and impact of study The preliminary results of the study suggest that B. thuringiensis spores’ suspension with different concentrations can be used as anti-mycotoxigenic agents to inhibit the (TeA) and (AME) mycotoxins produced by Alternaria alternata.
Bacillus thuringiensis ; Alternaria--isolation & ; purification ; Solanum tuberosum