Responses of the Mullet, Liza auratus and the Cichlid, Oreochromis niloticus from Lake Manzala (Egypt) to Heterophyd Infection

Ghobashy, Mahi A; Soliman, Maha F. M.; Hassan, Ehssan A.

doi:10.3923/ijzr.2010.13.23

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…But, the lowest infection prevalence in L. niloticus (12.50%) was found in autumn, whereas in M. cephalus (25.58%) it occurred in winter. Similarly, Ghobashy et al (2010) reported the highest prevalence of heterophyid infection in spring, in the two freshwater fish Liza auratus and Oreochromis niloticus,. While, they recorded the lowest prevalence in L. auratus in autumn and in O. niloticus in winter.…”

Section: Discussionmentioning

confidence: 84%

“…gariepinus and M. cephalus increased with the increase of fish weight till 150g, but decreased when fish weight increased, and there was a postive correlation at P < 0.05. while, Iyaj et al (2009) reported the occurrence of negative correlation between fish weight and reduction of parasitism. But, Ghobashy et al (2010) found also that the prevalence of heterophyid metacercariae in L. auratus was inversely proportion to weight, it decreases with increase of fish weight, but the correlation was insignificant. The present result coincides with those of Walfgang (1954) and Maksimova (1958) but is contrary to what Khalil et al (2014) reported.…”

Section: Discussionmentioning

confidence: 92%

“…Alteration in seasonal prevalence is most probably due to biotic and climate factors. The influence of these factors, as host condition and seasonal variation on transmission of fish parasites, relative to their prevalence and intensity, is well documented ( Massoud et al, 2007;El-Sheikha and El-Shazly, 2008;Ghobashy et al, 2010). There are numerous biotic and abiotic factors affecting parasite infection including physiological condition of the host ( e.g.…”

Section: Discussionmentioning

confidence: 99%

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2019

IRJPEH

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Examination of 452 fresh and brackish water fish, from Cairo district, Egypt, representing Clarias gariepinus, Lebeo noliticus and Mugil cephalus, revealed the occurrence of nine species of encysted metacercariae in Cl. gariepinus, belonging to family Heterophyidae, two unidentified digenean metacercariae in L. niloticus and two unidentified digenean metacercariae in M. cephalus. The relationship between parasite prevalence and fish species, seasonal prevalence and fish weight was investigated. The highest rate of infection (73.68%) was recorded in autumn, in Cl. gariepinus, while the lowest (54.05%) was observed in summer. Whereas, in M. cephalus and L. noliticus, the highest prevalence of infection (56.67 and 26.09%, respectively), was recorded, in spring. But, in M. cephalus the lowest infection rate (25.82%) was detected in winter, while in L. niloticus (12.50%), it was recorded in autumn. The intensity of infection in Cl. gariepinus increased with fish weight till 150g while, it decreased in fish weighing more than 200g. Similarly, in M. cephalus, the infection rate increased with increase of fish weight till 100g, but was lower in larger fish. In L. niloticus, there was no relationship between rate of infection and fish weight; the highest intensity of infection was recorded in fish weighing 100-150g. The identification of metacercariae was assessed by feeding experimentally two dogs with flesh of Cl. gariepinus, containing encysted metacercariae and the recovery of flukes from their intestines. The impact of infection of humans and animals is discussed.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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2019

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“…Pre-granulomas and granulomas associated with metacercariae were detected in all examined organs, with a higher prevalence in the kidney and heart. TM have a wide range of tissue distribution, as they have been reported in almost every organ of mugilids [ 60 , 61 , 62 , 63 , 64 , 65 ].…”

Section: Discussionmentioning

confidence: 99%

Stages of Granulomatous Response Against Histozoic Metazoan Parasites in Mullets (Osteichthyes: Mugilidae)

Polinas

Padrós

Merella

et al. 2021

Animals

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Histozoic parasite–fish host interaction is a dynamic process that leads to the formation of a granuloma, a specific chronic inflammatory response with discernible histological features. Mullets (Osteichthyes: Mugilidae) represent a suitable model concerning the development of such lesions in the host–parasite interface. The present work aimed to identify granuloma developmental stages from the early to the late phase of the infection and to characterize the immune cells and non-inflammatory components of the granuloma in different stages. For this purpose, 239 mullets were collected from 4 Sardinian lagoons, and several organs were examined by combining histopathological, bacteriological, and immunohistochemical methods. Granulomas associated with trematode metacercariae and myxozoan parasites were classified into three developmental stages: (1) pre-granuloma stage, characterized by intact encysted parasite and with no or mild tissue reaction; (2) intermediate stage, with partially degenerated parasites, necrosis, and a moderate number of epithelioid cells (ECs); and (3) late stage, with a necrotic core and no detectable parasite with a high number of ECs and fibroblasts. The three-tier staging and the proposed morphological diagnosis make it conceivable that histopathology could be an essential tool to evaluate the granulomas associated with histozoic parasitic infection in fish.

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