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  • Articles: DFG German National Licenses  (6)
Source
  • Articles: DFG German National Licenses  (6)
Material
Years
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 103 (1992), S. 955-962 
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Aquaculture 124 (1994), S. 283-284 
    ISSN: 0044-8486
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Science Ltd.
    Journal of applied ichthyology 17 (2001), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The productive performances and morphological traits of 60 000 Dicentrarchus labrax L. weighing 2.4 ± 0.6 g and obtained from intensive rearing were compared with 60 000 sea bass of the same age (110-day-old) weighing 2.1 ± 0.7 g obtained from a fish farm using the mesocosm technique during the larval phase. The trial lasted throughout the fattening period until harvest. Fish from the mesocosm system (SB-II) had a better final survival rate (69%) in comparison to those obtained from the intensive larval system (64.2%) (SB-I). No significant differences emerged between the two groups concerning the specific growth rate (SGR) or the feed conversion ratio (FCR). Although the weights were the same as the SB-I group, the final total length result was higher in the SB-II group (P 〈 0.0001). As for the other morphological traits, the standard length was significantly higher in the SB-II fish, while the maximum body depth showed similar values in the two batches. The greatest abdominal circumference was recorded in SB-I fish.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 13 (1997), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Survival rate, sex ratio and zootechnical performances were evaluated on 168 kg of Anguilla anguilla elvers (0.45 g) weaned into three groups (A1, A2, A3) at initial densities of 800, 1600 and 3200 g m−3, respectively. In order not to modify the sex ratio, animals weaned at the different densities were maintained separately during the trials, and no size grading was performed at the fattening phase.Final mean weight achieved by females belonging to the different groups showed no statistically significant differences; weight of males was higher (P 〈 0.05) in A1 than in A3 where a higher percentage of males was observed. Sex ratio of eels was different among the groups, with a higher percentage of males in A3 (96%) than in A2 (78%) or in A1 (69%). This finding testifies to a sex differentiation strongly affected by pre-fattening stocking density of elvers. Final load showed an increase in males corresponding to a significantly reduced biomass between A1 and A2 (10.97 and 10.24 kg m−3) and A3 (8.44 kg m−3). Final survival rate ranged from 87% (A1) to 90% (A3). As to food conversion, a better rate was found in A1 (1.9:1) compared to A2 (2.1:1) and A3 (2.3:1) eels.
    Type of Medium: Electronic Resource
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