الجودة الميكروبية ومتبقيات المضادات الحيوية للأسماك المباعة في قطاع غزة فلسطين

El Siqali, Asmaa (2017) الجودة الميكروبية ومتبقيات المضادات الحيوية للأسماك المباعة في قطاع غزة فلسطين. Masters thesis, الجامعة الإسلامية بغزة.

This is the latest version of this item.

[img] Text
123121.pdf

Download (2MB)

Abstract

Introduction: Fish diseases caused by pathogens (e.g. bacteria, viruses, fungi and parasites) affect the survival and growth rates of fish, and consequently lead to major economic losses. Furthermore, the microorganisms responsible for these infections belong to bacterial families that also produce infections in humans. Therefore, their transmission to human is highly probable. Several antibiotics including; oxytetracycline, sulfamerazine and ormetoprim, are used for treating bacterial infections in farmed fish. The use of antibiotics in aquaculture systems is usually associated with serious health hazard not encountered in wild captured species. The main concern is antibiotic residues and development of antimicrobial resistance in bacteria that may be transferred to consumers. Several types of fish are consumed daily by inhabitants of Gaza strip as source of protein. Objectives: In this study, the microbial quality for locally farmed, caught and imported (frozen) fish was evaluated and the presence of antibiotic residues was investigated. Methodology: The study examined 100 fish specimens that were purchased from local markets (60 farmed and 30 frozen and 10 caught fish). Total coliform, total viable count, Staphylococcus aureus, Salmonella, and Vibrio spp. were tested using standard methods. To investigate the presence of antibiotic residues, four classes of antibiotics were determined in fish samples using a bioassay method recommended by United States Department of Agriculture (USDA). Results: The most detected antibiotic residues were aminoglycosides 52 (52%) in sea bream, red tilapia and Nile tilapia. followed by tetracyclines 1 (1%) in sutchi catfish fillet and negative results for β-lactams and macrolides. Microbiological quality tests showed that 39% of fish samples failed to comply with the Palestinian standards, the percentage of failure due to Total Plate Count (4%), Total Coliform bacteria (39%), S. aureus 13%, and Salmonella spp. (1%). Conclusions: Results confirmed the presence of antibiotic residues in fish samples collected from Gaza strip. A confirmatory method such as gas chromatography (GC) is recommended to be used to determine residues compliance with the maximum residue limits. It is also recommended that measures should be implemented to ensure observing proper withdrawal periods before marketing and drug control in veterinary use. In addition, a monitoring policy should be implemented to ensure the conformity of fish sold in Gaza strip with international standards. The results emphasizes the need to promote awareness about possible health hazards that could result from poor handling of farmed fish.

Item Type: Thesis (Masters)
Subjects: Q Science > QE Geology
Q Science > QR Microbiology
Depositing User: أ. دارين علي أحمد حمد
Date Deposited: 01 Mar 2021 11:59
Last Modified: 01 Mar 2021 11:59
URI: http://scholar.alaqsa.edu.ps/id/eprint/3905

Available Versions of this Item

Actions (login required)

View Item View Item