Document Details

Document Type : Thesis 
Document Title :
EFFECT OF BIOFOULING ON GROWTH AND SURVIVAL OF FISH IN CAGES
تأثير الالتصاق الحيوي على النمو ونسبة بقاء الأسماك المرباة في الأقفاص وتقييم أساليب غير سامة لمكافحته.
 
Subject : Faculty of Marine Sciences 
Document Language : Arabic 
Abstract : Biofouling on marine installations is an important problem which needs huge budget for cleaning and antifouling measures. This study describes the development of biofouling on aquaculture cage nets and assessment of nontoxic antifouling measures. Bacteria and diatoms constitute the primary colonizers on the cage nets submerged in the central Red Sea. Additionally, polychaetes, amphipods, gastropods, mussels, ascidians and macroalgae were the common fouling organisms settled on the cage nets. The fouling community accumulation showed strong temporal and spatial variation in relation to sampling time or station. Extracts of three macroalgal species (Chaetomorpha linum, Tubinaria ornata and Sargassum polycystum) collected from the Rabigh coast of Red Sea were tested for antifouling activity. These algal extracts inhibited the settlement of cypris larvae of barnacle and biofilm-forming bacteria. The extracts of Tubinaria ornata and Sargassum polycystum significantly reduced the biofouling growth on nylon net panels in field trials conducted for a period of three months. Also, antifouling activity of two enzymes mixture (protease and α-amylase) was assessed against the barnacle larvae. The enzymes inhibited the settlement of barnacle larvae in laboratory experiments. Antifouling assay in marine waters also showed that the enzymes significantly reduced the biofouling growth on nylon net panels submerged for a period of three months. In general, results showed a moderate biofouling growth on nylon nets submerged in central Red Sea coast. Further, natural products and enzymes could be used as nontoxic or less toxic ecofriendly antifoulants for reducing biofouling growth on aquaculture structures. 
Supervisor : Dr. SatheeshSathianeson 
Thesis Type : Doctorate Thesis 
Publishing Year : 1440 AH
2019 AD 
Added Date : Wednesday, March 27, 2019 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد علي بلقديbalqadi, Ahmed AliResearcherDoctorate 

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 44158.pdf pdf 

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