Effect of different holding regimens on the intestinal microflora of Herring(Clupea harengus) larvae

Article Abstract:

The intestinal microflora of fish was studied to describe its characteristics and to know the effects of antibiotics on it. The antibiotics used were penicillin and streptomycin. Microbiological methods and electron microscopy were used to characterize the microflora. Results showed existence of an intestinal microflora in the posterior hindgut during the early life stages of the fish larvae. Exposure of the microflora to the antibiotics revealed resistance of the Flavobacterium species but not the Pseudomonas or Alteromonas strains. Ingestion of bacteria appeared to induce the establishment of an intestinal microflora and seemed to be of nutritional importance to the larvae due to their endocytic ability. Experimental results suggest the significance of the effect of antibiotics in the development of marine fish larvae.

Physiological aspects, Intestines, Intestinal microbiology, Fishes, Herring

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Indigenous bacteria in hemolymph and tissues of marine bivalves at low temperatures

Article Abstract:

Hemolymph and soft tissues of marine bivalves contain bacteria at temperatures below 8 degrees centigrade. Healthy oysters (Crassostrea gigas) and horse mussels (Modiolus modiolus) are studied to find the extent to which bacteria is present. There is an augmented invasion of bacteria in hemolymph and soft tissues when bacterial numbers are increased in sea water at 4 degrees centigrade. Bivalves may serve as a reservoir for pathogens of fish at low temperatures.

Environmental aspects, Host-bacteria relationships, Bivalvia, Bivalves

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Horizontal transfer of a multi-drug resistance plasmid between coliform bacteria of human and bovine origin in a farm environment

Article Abstract:

Researchers discovered coliform bacteria in humans and cows on one farm that were resistant to ampicillin, tetracycline, streptomycin, trimethoprim, and sulfonamides. The multi-drug resistance gene occurred on a plasmid that was identical in both humans and cows.

Drug resistance in microorganisms, Microbial drug resistance, Plasmids

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