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Environ Pollut. 2016 Oct 6. pii: S0269-7491(16)31297-0. doi: 10.1016/j.envpol.2016.09.044.
[Epub ahead of print]
Infectious
bacterial
pathogens,
parasites
and
pathological correlations of sewage pollution as an
important threat to farmed fishes in Egypt.
Mahmoud MA1, Abdelsalam M2, Mahdy OA3, El Miniawy HM4, Ahmed ZA5, Osman
AH4, Mohamed HM6, Khattab AM7, Zaki Ewiss MA8.
Author information
Abstract
This paper is a part of a multi-disciplinary research "Application of Decentralized On-Site
Water Treatment System in Egypt for Use in Agriculture and Producing Safe Fish and
Animal Proteins". The project aimed to investigate the environmental impact of
implementing sewage water before and after treatment using the effluent of the on-site
decentralized Japanese' Johkasou system, in agriculture and producing fish protein. The
aim is to establish such system in Egypt to strengthen the sanitary conditions of water
resources. In the present study, the impact of the sewage pollution in some fish farms at
El-Fayyum, Port Said and El-Dakahlia governorates in Egypt was carried out. Water and
fish (Oreochromis niloticus and Mugil cephalus) samples were collected from private fish
farms of such localities. Bacteriological and chemical examination of water samples
revealed the existence of coliforms and many other bacterial species of significant human
health hazards. The chemical parameters of water showed a marked deviation from
normal levels while examination of fish flesh specimens indicated contamination with
Streptococcus Sp., Staphylococcus Sp., and Salmonella in all examined localities. Other
bacterial isolates of human health importance (Morganella morganii, Pseudomonas
cepacia and Enterococcos durans) were identified. The parasitological examination
revealed
the
presence
of
encysted
metacercariae
(EMC);
Diplostomatidae,
Prohemistomatidae and Heterphyidae. Moreover, two protozoan parasites (Mxyoboulus
tilapiae and Ichthyophthirius multifilis) were also recorded. The histopathological
examination revealed mild tissue reaction in case of bacterial infection and severe
pathological lesions in different organs in case of EMC infection. Lamellar hyperplasia
and mononuclear cell infiltration in branchial tissue was common findings. In skeletal
muscles, atrophy of muscle fibres, myolysis and myophagia were detected.
Copyright © 2016 Elsevier Ltd. All rights reserved.
KEYWORDS:
Egypt; Enterococcus; Fish; Morganella; Pseudomonas; Water pollution