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Toxic effects of Streptomyces griseus spores and exudate on gill pathology of freshwater fish.

Abstract：

:Many unexplained fish-kills in British waters are considered microbial in origin and a large proportion of field sites contains elevated concentrations of filamentous actinobacteria. The present study has shown that a strain of Streptomyces griseus, isolated from field sites, elicits pathological changes to the gills of fish under laboratory conditions which mirror those found in situ. These changes include hyperplasia leading to fusion of the secondary lamellae and loss of microridging on the filamental epithelium of the primary lamellae. Juveniles of up to six fish species were exposed to spore suspensions or exudate of S. griseus in the range of 1 x 10(2)-1 x 10(6)spores ml(-1) for up to 96 h. The exudate was more potent than the spores and there was a positive correlation between exudate concentration and the rate and extent of fish gill pathology with bream and rainbow trout being more sensitive than carp, tench and roach. The results are discussed in the context of recognising and managing potential fish mortalities caused by microbial toxins.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Lewis JW,Morley NJ,Drinkall J,Jamieson BJ,Wright R,Parry JD

doi

10.1016/j.ecoenv.2008.07.011

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

173-181

issue

1

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(08)00190-5

journal_volume

72

pub_type

杂志文章

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