| 3 | Morphological Changes in the Gills of Tilapia Fed Sterilized and Nonsterilized Sludge显示文摘The effects of digested sludge on the ultrastructure of gills of Sarotherodon mossambicus wereinvestigated.Samples of digested sludge were collected from the Shatin Sewage Treatment Plantin Hong Kong and.they were (1)sun-dried(NS)or(2)sterilized in an autoclave(SS).They werethen used as supplementary fish feed to cultivate the freshwater tilapia,S.mossambicus,for 50days under laboratory conditions.The SS at low dosage(25%)had the lowest toxicity amongdifferent treatments.A swelling of lamellar epithelium,the enlargement of the subepitlaelialspace,the collapse of capillaries,and the infiltration of polymorphonuclear cells in the lamellaeoffish gills were common to fish fed 50 to 100% NS and SS.The thickening of the basal laminain the gill lamellae is a common feature found in the sludge-treated fish.1989 AcademicPress.Inc. | W.K.LIU M.H.WONG Y.H.CHEUNG | 1989 | Biomedical and Environmental Sciences1989，2，2： | 0 |
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