engleski

Aquahealth for fish swimming

Fish are always in intimate contact with their environment, therefore they are permanently exposed to different impacts. Comprehension that fish are in a very close contact with their environment, the bacterial genera present in the skin mucus seems to be those from the environment and it is apparent that there are many similarities between the bacterial communities in the water and those on fish. The internal organs of apparently healthy fish has been considered to be sterile, but isolations of bacteria from internal organs have frequently been reported. However, this bacterial community depends on the fish environment, fish species and its health status. For that reason, our project AQUAHEALTH (Aquatic microbial ecology as an indicator of the health status of the environment) proposes comprehensive study of physicochemical environmental conditions, as well as study of bacterial community within water column, sediment and fish as indicator of the aquatic environmental health status and its potential implications to human health. Fresh and marine water sampling will be conducted to assess inputs to the Ilova River, the Krka River and in the south part of East Adriatic (Malostonski bay), as well as the movement of nutrients and bacteria to identify and quantify the sources of pollution at each location. These three aquatic environments were chosen to cover different environmental rearing conditions and aquaculture technologies that due to our previous knowledge have different influence to the environment. Fish swimming is elementary characteristic which providing their ability to develop, survive, grow and reproduce successfully. Swimming performance decreased following chronic exposure to environmental stress factors which contributing to health alteration. Non-optimal environmental parameters could be the trigger for opportunistic bacterial infections in fish. Until the appearance of clinical signs of disease infection is unrecognized and fish swimming is usually normal. Bacteria can affect all aspects of food production, in this case from aquaculture and fisheries through processing to retail, presence of some bacteria presenting a threat to the public health.

environment, bacteria, Ilova, Krka, Malostonski bay

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