الفهرس 
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Abstract
two experiments were carried at Fish Feed Lab at the National Institute of Oceanography and Fisheries, Alexandria, Baltim branch.the experiment took place over the course of 70 days.the experiment was in two parts, one of which shows the effect of different levels of fucoidan on fish and knowing the level of fucoidan. As for the other part, which is fucoidan and its effect on atrazine. 180 fish were taken with average weight 16.77g , and distributed randomly in 12 glass aquaria .each group 3 tanks and we had 4 treatments so, at the end of the experiment fucoidan showed positive effects on fish as improved in growth performance, intestinal health and hematological profile of fish
In the second trial fucoidan overcome on the posinousing of Atrazine and also showed positive effect on fish.