Time filter

Source Type

Al-Jufaili S.H.,University of Rostock | Al-Jufaili S.H.,Fishery Quality Control Center | Freeman M.A.,Ross University School of Medicine | Machkevskyi V.K.,Fishery Quality Control Center | And 2 more authors.
Parasitology Research | Year: 2016

Investigations regarding the parasite fauna of wild whitespotted rabbitfish (Siganus canaliculatus) Park, 1797 revealed white, spherical, loosely attached cysts measuring 896 (375–1406) μm in diameter in the inner endothelial wall of the esophagus and stomach. Mature spores inside these cysts corresponded to the original description of spores belonging to the genus Unicapsula Davis, 1924. Unicapsula fatimae n. sp. spores were 6.23 (5.60–6.60) μm in length and 6.80 (6.12–7.39) μm in width. The length of large polar capsule was 2.62 (2.18–2.97) μm and width was 2.65 (2.32–2.90) μm, and the extended large polar capsule filament length was 15.50 (11.71–19.99) μm. Transmission electron microscope images of the plasmodia revealed a complex cyst structure that was unique among other Unicapsula spp. Ultrastructural details of the host–parasite interface and developmental stages of a species from the Unicapsula genus are described for the first time. Histology of an infected esophagus revealed some abnormalities and changes in the host tissue around the infection site, including hypertrophy of host esophagus epithelial cells and hyperplasia of host glandular tubules. The parasite presented here has been added to the genus Unicapsula using comparative morphological analysis and ultrastructural investigations supported by 18S small subunit ribosomal DNA molecular analysis. © 2015, The Author(s).

Machkewskyi V.K.,Fishery Quality Control Center | Dmitrieva E.V.,Fishery Quality Control Center | Gibson D.I.,Fishery Quality Control Center | Al-Jufaili S.,Fishery Quality Control Center
Systematic parasitology | Year: 2014

Specimens of Lamellodiscus Johnston & Tiegs, 1922 (Monogenea: Diplectanidae) were collected from the gills of Cheimerius nufar (Valenciennes) (Sparidae) in the Arabian Sea. All of these parasites belonged to one and the same species, which is morphologically very close to L. euzeti Diamanka, Boudaya, Toguebaye & Pariselle, 2011. A different host, distant locality and small morphological differences compared with the original description of L. euzeti acted as a stimulus for a detailed redescription. The specimens from the Arabian Sea differ slightly in the details of the male copulatory organ (MCO) from the type-specimens of L. euzeti, which were re-examined, and from the respective drawings in its original description. Such differences include a longer inner process of the large element of the accessory piece associated with the proximal part of the copulatory tube, a longer point on the small element of the accessory piece associated with the distal part of the copulatory tube, and the presence of a smooth or slightly folded inner margin of this element rather than structures resembling spines which occur in the type-specimens of L. euzeti. Therefore, the present specimens infecting C. nufar in the Indo-Pacific may represent a different, but morphologically very similar species to the Atlantic form L. euzeti; consequently, they are recognised here as Lamellodiscus aff. euzeti. This form belongs to the 'ignoratus s. str.' subgroup of the genus. The composition of this subgroup is redefined to comprise 17 species, including L. corallinus Paperna, 1965 but excluding L. acanthopagri Roubal, 1981, and the morphology of the MCO of representatives of this group is clarified. A link between the diversity of Lamellodiscus species and the ancestral origin of present-day sparid species in the Tethys Sea is suggested. It is shown that Lamellodiscus spp. exhibit rather high levels of specificity to their hosts, since half of them parasitise only a single host species and c.90% infect closely related host species. Comparison of the levels of host-specificity of the species of this genus with other narrowly specific genera of the Dactylogyridea revealed that their estimations are comparable. The possibility of intra-host speciation within Lamellodiscus is discussed. It is shown that a co-evolutionary model is more discernible if it includes data on the occurrence of morphologically similar species from different regions and host taxa.

Sudheesh P.S.,Fishery Quality Control Center | Al-Ghabshi A.,Fishery Quality Control Center | Al-Aboudi N.,Fishery Quality Control Center | Al-Gharabi S.,Fishery Quality Control Center | Al-Khadhuri H.,Fishery Quality Control Center
Advance Journal of Food Science and Technology | Year: 2013

This study was undertaken to find out the total microbiological load and the presence of pathogenic microorganisms on food contact surfaces in seafood retail markets in the Sultanate of Oman. Microbiological and sanitary conditions on food contact surfaces in four retail fish markets was studied by using Food Stamp Rodac (Replicate Organism Detection and Counting) plates and ATP sanitation monitoring system. High plate readings of Total Colony Count (TCC) and indicator organisms such as total coliforms, yeasts and molds and Escherichia coli were obtained from samples collected from most food contact surfaces. Similarly, significant numbers of pathogenic bacteria such as Salmonella sp., Staphylococcus aureus and Clostridium perfringens were observed in microbiological samples from all fish markets. Hygiene status of the food contact surfaces studied using the AccuPoint® Sanitation Monitoring System showed extremely high levels of Adenosine Triphosphate (ATP) on all food contact surfaces in all fish markets. Only water samples showed very low ATP levels. This study reveals the presence of contaminating and pathogenic bacteria in seafood retail outlets and the urgent need to improve the hygiene status of retail fish markets in the Sultanate of Oman. © Maxwell Scientific Organization, 2013.

Al Ghabshi A.,Fishery Quality Control Center | Al-Khadhuri H.,Fishery Quality Control Center | Al-Aboudi N.,Fishery Quality Control Center | Al-Gharabi S.,Fishery Quality Control Center | And 3 more authors.
Advance Journal of Food Science and Technology | Year: 2012

This study describes the relationship between the freshness of the starting raw material (fish) and the final product quality in experimentally dried shark fish. Sharks were stored at room temperature (25°C) for 0, 24 and 48 h and then salted, processed and sun dried at ambient temperatures ranging from 35 to 42°C. There was marked difference in sensory and microbiological quality of fresh fish stored to different time periods, but, after drying, the quality difference was negligible. The results of this study show that storage of fish up to 48 h under experimental conditions at room temperature does not affect major microbiological quality and proximate composition of the final dried product. © Maxwell Scientific Organization, 2012.

Al-Busaidi M.,Fishery Quality Control Center | Yesudhason P.,Fishery Quality Control Center | Al-Mughairi S.,Fishery Quality Control Center | Al-Rahbi W.A.K.,Fishery Quality Control Center | And 3 more authors.
Chemosphere | Year: 2011

Commercially important fresh (581) and frozen (292) marine fish samples of 10 species were collected from seafood factories and evaluated using AAS and ICP-OES. Metal levels significantly (p<0.05) varied within and between species. However, there were no significant correlations among metals. There were significant interspecific differences for all metals, and yellowfin tuna had the highest level of cadmium and mercury however, red seabream had maximum numbers above the standards. The metal accumulation significantly varied between bottom feeders of intermediately size locally caught fish. The mean cadmium level ranged from 0.0049 to 0.036mgkg -1 and 1.37% of the total samples exceeded the EU and FAO standards. Mean lead content varied between 0.029 and 0.196mgkg -1, few samples crossed the EU (2.63%) and FAO (1.6%) limits. Mean mercury level ranged from 0.015 to 0.101mgkg -1 and none of the samples exceeded the EU limit. Of the total samples analyzed red seabream (2.06%), yellowfin tuna (1.14%), emperor (0.34%), santer bream (0.22%), king fish (0.11%) and skipjack tuna (0.11%) samples crossed the EU limits. In general, fish from these regions are within the safety levels recommended by various organizations and do not pose a health risk in terms of human diet. © 2011 Elsevier Ltd.

Discover hidden collaborations