Document Details

Document Type : Thesis 
Document Title :
Biochemical Changes in Lipids and Some Minerals in Relation to Larval Trematode Infections of Some Marine Snails
التغيرات البيوكيميائية في الدهون و بعض المعادن نتيجة الإصابة بيرقات الديدان الورقية لبعض القواقع البحرية
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : Marine snails play an important role in the transmission of cercariae to fish as a source of zoonotic diseases. In Saudi Arabia, studies on parasitic infections in marine snails are rare. The current study aimed to screen the collected snails for the prevalence of cercarial infections and biochemical changes in lipids and some minerals for the whole year using parasitological methods for 875 marine snails belonging to the genus Nerita. Snails were collected randomly and monthly from February 2018 to January 2019 from the Red Sea Obhor bay, Jeddah city, Saudi Arabia. The amount of lipids in the Digestive Gland Gonad complex (DGG), hemolymph and Snail Conditioned Water (SCW) of non-infected and infected snails was estimated using a spectrophotometer. Minerals concentration in the DGG and shell in the infected and non-infected snails were analyzed using Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Total prevalence of larval trematode infection was 14.05% (123/875). The most prevalent infected snail species was N.polita (20.43%). Six distinguishable cercariae were identified. Trichobilharzia regenti cercaria was the most prevalent type of recorded cercariae (26.83%). There is a positive correlation between infection prevalence and snail’s length. Trematode infection of the studied snails are influenced by temperature and varied seasonally. The study showed that there is a fluctuation in the concentration of lipids and minerals between the increase and decrease in DGG, hemolymph, shell and SCW of the infected snails. The nutritive value of the infected is affected with infection through the decrease of some lipids in infected snails. On the other hand, larval trematodes play an important role in the accumulation of minerals in their bodies. Therefore, it is useful to recognize molluscs as a potential biomonitor to determine a relationship between concentrations of a given metal in the organism and its bioavailability form in the associated sediment. This study also can assist in collecting data on the ecological relevance of disease distribution in the sympatric fish and the pattern of transmission of digenean trematodes by snails and finally in the prevention and control of the following fish and human diseases. Further qualitative studies are recommended. 
Supervisor : Dr. Amaal Hassan Mohamed Hassan 
Thesis Type : Master Thesis 
Publishing Year : 1441 AH
2020 AD 
Co-Supervisor : Dr. Amani Ahmad Rifai Filimban 
Added Date : Saturday, June 6, 2020 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
ندا سعد الحازميALhazmi, Neda SaadResearcherMaster 

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