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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Temperature on Growth and Protein Assimilation in Juvenile Leader Prawns Penaeus monodon (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 26 (1995), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract.— The effects of temperature on growth and protein assimilation in leader prawns Penaeus monodon were evaluated. Growth of leader prawns was significantly (P 〈 0.05) affected by temperature. The highest growth rate was 0.124 g/d at 32.0 C and optimum growth occurred between 27.5–32.0 C. Growth was described by an equation of the form: Wt= Woekt (R2= 0.99). The relationship between temperature and growth was described by a curvilinear equation of the form: Y = a + bX + cX2 (R2= 0.70). Apparent protein assimilation efficiency was not significantly (P 〉 0.05) affected by temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.1995.tb00844.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    More accurate chronological age determination of crustaceans from field situations using the physiological age marker, lipofuscin (1994)
    Springer
    Marine biology 121 (1994), S. 237-245 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A captive population of Australian red-claw crayfish, Cherax quadricarinatus, of known age was used for the study. Lipofuscin concentration in the left olfactory lobe cell mass of the brain was measured using image analysis of fluorescence micrographs. Age predictions based on lipofuscin concentration were more accurate and had narrower 95% confidence limits than those derived from the more conventional body size and weight predictors for all age groups tested (180, 300, 420, 780 d). Overall, use of lipofuscin concentration produced a significantly lower (p0.001) mean age-prediction error (16.65%) than use of carapace length or body weight (32.45 and 32.3%, respectively). Carapace length was of little value for prediction of the age of older individuals. Mathematical models defining the relationships between temperature, age and lipofuscin accumulation were derived from laboratory-reared individuals. These models did not describe adequately the course of lipofuscin accumulation in crayfish from the field over the whole lifespan. Field data from three “known” year-classes were used to generate simulated size-frequency and lipofuscin concentration-frequency histograms. Year-classes in the lipofuscin concentration frequency-histogram were much more easily distinguished than in the size-frequency histogram. Under field conditions, lipofuscin concentration was a better predictor of chronological age than conventional morphometric measures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346731
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Control of distal retinal pigment migration in the fiddler crab Uca pugilator (1971)
    Springer
    Marine biology 9 (1971), S. 219-223 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several concentrations of extracts prepared from the eyestalks of a specimen of Uca pugilator were injected into other U. pugilator individuals. The distal pigment of the eyes first became light adapted and then dark adapted, the whole process lasting 6 h. The mean integrated response for light adaptation increased progressively up to the highest tested extract (3 eyestalk equivalents/dose), but with the darkadapting response the maximal effect was produced by the extract containing 2 eyestalk equivalents/dose. Gel filtration of eyestalk extracts in Sephadex G-50 showed that the fractions associated with greatest light adaptation were also associated with greatest pigment dispersion in the melanophores. Almost no light or dark adaptation of the retinal pigment resulted from injections of eyestalk extracts treated with α-chymotrypsin which supports the interpretation that these substances are polypeptides of neurosecretory origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351382
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Trace element concentrations in tropical marine fish at Bougainville Island, Papua New Guinea (1981)
    Springer
    Water, air & soil pollution 16 (1981), S. 143-158 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Baseline trace element concentrations have been measured in eight species of marine fish from Bougainville Island, Papua New Guinea. This is the first stage in an assessment of environmental impact associated with mining operations. In general, concentrations of Cu, Pb, Zn, Cd, Hg, and As in edible portions of the fish comply with Australian National Health and Medical Research Council public health standards. Two species of shark contained As concentrations in muscle tissue in excess of prescribed standards. Increased concentrations of Cu, Zn, and Cd were recorded in liver and kidney, but Hg and Pb were not preferentially accumulated in these organs. The relationship between the size of fish and metal assay was investigated. Mercury content and weight of fish were always positively correlated but concentrations of other metals were variably correlated with size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046851
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    Paper (German National Licenses)
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