Fish Physiology and Biochemistry

, Volume 5, Issue 1, pp 9–19 | Cite as

Interacting effects of diet and environmental temperature on biochemical parameters in the liver ofLeuciscus idus melanotus (Cyprinidae: Teleostei)

  • Johannes Rafael
  • Thomas Braunbeck


One year old golden ide (Leuciscus idus melanotus) were starved for 2 weeks at 20°C (time zero) and then they were fed either freeze-dried mosquito larvae (natural diet) or a commercial fish chow (artificial diet) at an ambient temperature of 14°C and 20°C, respectively. Growth parameters and biochemical data in the liver were measured at time zero and after 3 and 7 weeks of specific regimen. If compared to natural food, the artificial diet caused transient increase in anabolic activity of the liver, but prevented long-lasting hepatocyte proliferation (increase of total liver DNA). After 3 weeks on artificial diet, the body weight was significantly higher and the liver mass doubled compared to ide kept on the natural regimen; tissue DNA content indicated that the hepatocyte volume increased mainly by increased protein content and corresponding uptake of water; lipid and glycogen contents were increased by a factor of 3–6, and the RNA∶DNA ratio was increased accordingly. The growth of the ide, as reflected by the condition factor and hepatosomatic index (HSI), was virtually stopped when the artificial regimen was maintained for 7 weeks, whereas on natural food the condition factor was increased and liver weight and DNA were doubled. Growth of the fish maintained at 14°C was significantly lower than that of fish maintained at 20°C, though the total liver DNA was still increased on the natural regimen during the experiment. Less lipid was stored by fish maintained at 14°C, whereas protein and glycogen deposits were enlarged, if compared to fish maintained at 20°C. The specific activity of cytochrome oxidase in liver mitochondria and of NADPH cytochrome c reductase in the microsomal fraction were found independent of diet and ambient temperature. Oxidative capacity of hepatocytes (mitochondrial protein/mg DNA) remained unchanged, and microsomal protein/cell appeared reduced in response to the artificial food. However, reduction of cell number on this diet resulted in less total mitochondrial and microsomal protein in the organ. Golden ide liver is found to be a sensitive experimental model to characterize the mutual influence of diet and temperature on fish; the results are discussed with regard to the usage of golden ide as test fish for water pollution.


ide adaptation nutrition temperature growth liver nucleic acids storage products 


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Copyright information

© Kugler Publication 1988

Authors and Affiliations

  • Johannes Rafael
    • 1
  • Thomas Braunbeck
    • 2
  1. 1.Institut für Biochemie IUniversität HeidelbergHeidelbergWest Germany
  2. 2.Zoologisches Institut IUniversität HeidelbergHeidelbergWest Germany

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