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  • 1990-1994  (2)
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  • 1990-1994  (2)
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  • 1
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The effects of two different catchin methods and one handling method on the plasma glucose, cortisol and androgens of brown trout (Salmo trutta morpha fario) were evaluated 2 minutes, 4 hours and 30 hours after capture. Plasma levels of glucose were influenced by stressing factors in both sexes; cortisol levels increased at different times in males, deending on the stressor, and immediately in all treatments in females. After handling, androgen titres showed a very sharp decline in both sexes, whereas with catching methods only male androgens were affected.〈section xml:id="abs1-2"〉〈title type="main"〉Zusammenfassung Die Auswirkungen von Streß durch Handhabung und Fang der Bacbforelle (Salmo trutta morpha fario) auf Plasmaglucose, Cortisol und -androgenZur Untersuchun der Auswirkungen von zwei unterschiedlichen Fangmethoden und direktem Ergreifen mit der Hand auf die Bachforelle (Salmo trutta morpba fario) wurden die Werte für Glucose, Cortisol und Androgene im Plasma 2 Minuten, 4 Stunden und 30 Stunden nach dern Fang bestimmt. Die Glucosewerte im Plasma wurden bei beiden Geschlechtern durch Streßfaktoren beeinflußt. Die Cortisolwerte stiegen bei den Männchen je nach Streßfaktor nach verschiedenen Zeiten an, bei den Weibchen bei allen Faktoren sofort. Bei den Androgenwerten war bei beiden Geschlechtern nach Anfassen (mit der Hand) ein deutlicher Rückgang zu verzeichnen, während sich die Anwendung von Fanggeräten nur auf die Androgene der Männchen ausgewirkt hat.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 9 (1993), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Oocyte growth within the follicle is due to the accumulation of the normal cytoplasmic components, and the endocytosis of hepatic derived rotein, the vitellogenins. Vitellogenesis started in 200μm oocytes; during oocyte growth the olk Lbules increased in number and size. Yolk globule morphology varies durin oocyte growth: irst Jey appear uniform and dense; then, in 500 μm oocytes they oten appear to be divided into 2 or 3 dense masses. Yolk proteins of pre-maturational oocytes at different stages were compared with those of ovulated eggs by SDS gel electrophoresis. The largest comonents stained by Coomassie blue and those stained by Stains-all, which had formed during viteligenesis, either disappeared or diminished, while smaller components appeared. The changes in yolk rotein banding patterns during oocyte maturation are suggestive of extensive secondary proteol sis of yolk proteins; such secondary proteolysis may generate, as in other marine teleosts, part of the osmotic gradient associated with the resumption of oocyte meiotic maturation, before ovulation.
    Type of Medium: Electronic Resource
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