According to our previous results the gastropod Lymnaea stagnalis exposed to MC-producing cyanobacteria accumulates microcystins (MCs) both as free and covalently bound forms in its tissues, therefore representing a potential risk of MC transfer through the food web. This study demonstrates in a laboratory experiment the transfer of free and bound MCs from L. stagnalis intoxicated by MC-produci...

We investigated the histopathological alterations in tissues of freshwater mussel, Lamellidens marginalis response to oil effluent. Based on previous acute toxicity, two sub lethal [1/4th (11.88ppt) and 1/10th (8.55ppt)] concentrations effluent (hydrocarbon) were prepared exposed mussels. In a first series experiment, animals exposed/accumulated for 30 days [Ist, 8th, 15th, 22nd 30th days] by o...

This study aims to determine the abnormal tissue structure of gill organs in Tilapia (Oreochromis niloticus) due infection. The type research used is experimental using a randomized design. sample was tilapia infected with disease, taken from nursery pond poor water quality. can be seen macroscopic characteristics sick tilapia. conducted at Histopathology and Pathology Laboratory Sempur Freshwa...

Histopathological studies were conducted on carp fingerlings of Labeo rohita, Catla catla and Cirrhinus cirrhosus during October 2003 to May 2004 from fish farms of Mymensingh area. Monthly samplings were done with 10 fish from each species with the help of seine net. Skin, muscle, gill and liver were collected, processed and stained in Haematoxylin and Eosin. Histologically carp fingerlings of...

Sewage effluent is a powerful agent of ecological change in estuaries. While the effects of sewage pollution on water quality are usually well documented, biological responses of exposed organisms are not. We quantified health impacts in the form of pathological tissue changes across multiple organs in estuarine fish exposed to elevated levels of treated wastewater. Structural pathologies were ...

The present study tested the susceptibility and pathological changes of catla, Catla catla (Hamilton) infected with Edwardsiella tarda (ET-PG-29). The bacterium was isolated from the kidney of a diseased pangas catfish. To determine the median lethal dose (LD50), C. catla were challenged with this bacterium (10-10 CFU ml), and the LD50 was calculated as 10 5.5 CFU ml. Another set of healthy C. ...

The temporal expression of various biological rsponses was determined in Bluegill SunfishLepomis macrochirus exposed under controlled laboratory conditions to sediment containing high concentrations of polynuclear aromatic hydrocarbons, polychlorinated biphenyls and heavy metals. Liver, gill, blood, kidney, brain, spleen and intestine were removed from Sunfish sampled at 1, 2, 4, 8, 16, and 40 ...

Polycyclic aromatic hydrocarbons (PAHs) are priority contaminants in coastal and estuarine ecosystems under anthropogenic pressure. Although PAHs tend to accumulate the sediment, toxicity for benthic flat fish such as soles may be caused by released from sediment water column. Within this context, present investigation aims at recognizing toxicopathic effects elicited after waterborne exposure ...

Challenge models generating gill lesions typical for columnaris disease were developed for the fry of both Common Carp Cyprinus carpio and Rainbow Trout Oncorhynchus mykiss by means of an immersion challenge and Flavobacterium columnare field isolates were characterized regarding virulence. Carp inoculated with highly virulent isolates revealed diffuse, whitish discoloration of the gills affect...