الفهرس 
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Abstract
I wish to express my deep gratitude and appreciation to professor dr amin a samaan director of alexandria institute of oceanography and fisheries for suggesting the problem supervising the work and intensive revision of the manuscript iam especially intdebted to him for many stimlating dissussions which helped in revealing alot of problem a special debt of gratitude is owed professor dr salah E barakat head of botany department.