Examination in Resistance Tests of Some Strains of the Aeromonas hydrophila punctata Group Isolated from Carp

Neumann, W; Plöger, Wilfried

doi:10.1007/978-3-642-67854-7_15

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1993

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“…Moribund fish were examined for bacteria by streaking liver, kidney and spleen on TSA-plates and culturing at 20°C. Cultures were identified using routine laboratory procedures (Neumann & Ploger 1980). Twice each month from mid-June to mid-September, five randomly captured fish from each cage were examined for clinical signs, condition (weight and length) and presence of bacteria.…”

Section: Samplingmentioning

confidence: 99%

Mortality of marine cultured rainbow trout, Oncorhynchus my kiss (Walbaum), during the summer in the Netherlands

Oorschot

Boon

1993

Aquaculture Res

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Abstract. In northern Europe, rearing of rainbow trout, Oncorhynchus mykiss (Walbaum), in sea cages is a substantial part of fish culture. One of the major constraints for the development of this system in other parts of Europe is the unexplained mortality of fish during the summer. To investigate environmental aspects of this mortality, rainbow trout, cultured in cages in sea water, were monitored from May to October for three successive years. No evidence of bacterial involvement could be found, while water temperature and salinity strongly influence the mortality. This supports the suggestion that the mortality has been caused by patho‐physiological changes due to higher metabolic requirements for osmoregulation at elevated water temperature in the saline environment which might result in a dissipation of O2 by CO2 on the hemoglobin.

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Section: Samplingmentioning

confidence: 99%