Research ArticleOpen Access

Seasonal Parasitic Infestations and their Close Relationship to Immune Suppression in Cultured Sea Bass (Dicentrarchus labrax l) and Sea Bream (Sparus auratus)

Volume 6 - Issue 4

**Khalil RH¹*, Medhat S Shakweer², Hanan A Ghetas³, Khallaf M⁴ and Sherif El Shanat¹**

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- ¹Fish diseases and Management, Department of Internal medicine, Infectious and Fish diseases, Faculty of Veterinary Medicine, Mansoura University, Egypt
- ²Aquatic Animal Medicine and Management Department Faculty of veterinary medicine-Sadat City University, Egypt
- ³Department of Poultry and Fish, Faculty of Veterinary Medicine, Alexandria University, Egypt
- ²Department of parasitology, Faculty of Veterinary Medicine, Alexandria University, Egypt
*Corresponding author: Khalil RH, Fish diseases and Management, Department of Internal medicine, Infectious and Fish diseases, Faculty of Veterinary Medicine, Mansoura University, Egypt

Received: June 21, 2018; Published: July 10, 2018

DOI: 10.26717/BJSTR.2018.06.001376

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Abstract

The study identified and compared the prevalence and intensity of parasites of sea bream (Sparus auratus) and sea bass (Dicentrarchus labrax L.) from culture environments during different season. One hundred and twenty samples from each of sea bream and sea bass (30 from each type of fish per season) were collected and gross observations were carried out to check for physical abnormalities and presence and identification of parasites as well as another 20 apparently healthy samples from each of sea bream and sea bass. The water samples were also collected to evaluate the different water quality. The samples were dissected and the skin and gills were examined for parasites presence, prevalence and intensity. Two classes of parasites were recovered namely protozoans [1] and two types of trematodes namely; Monogenea (Dactylogyrus sp and Gyrodactylus sp). Cultured sea bream and sea basshad higher parasitic infections, intensity, prevalence and the parasites were significantly different in the tissues and organs. Blood and serum samples were collected for determine of some immune parameters namely, total protein, globulin, lysosomal activity in parasitized and non - parasitized fishes. The all previous mentioned immune parameters were mostly reduced. Finally the histopathological section taken from different external organs revealed parasitic stages.

Keywords: Sea Bream; Sea Bass; Water Quality; Cryptocaryon Irritans; Dactylogyrus Sp; Gyrodactylus Sp; Immune Parameters; Histopathological; Fish Mortality; Parasite Fauna