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  • Brachionus plicatilis  (4)
  • Springer  (4)
  • American Geophysical Union
  • Springer Nature
  • 2020-2022
  • 1990-1994  (4)
  • 1930-1934
Collection
Keywords
Publisher
  • Springer  (4)
  • American Geophysical Union
  • Springer Nature
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of rotifer culture quality with yeast plus oil and algal-based cultivation diets (1994)
    Springer
    Aquaculture international 2 (1994), S. 225-238 
    Details
    ISSN: 1573-143X
    Keywords: Rotifers ; Brachionus plicatilis ; Culture quality ; Lorica length ; Biomass ; Lipid ; Protein ; Bacterial content ; Viability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The culture quality of rotifers, Brachionus plicatilis, was compared for yeast and algal-based cultivation diets. The rotifer quality was evaluated based on factors which may affect survival and growth of marine fish larvae, including individual length and biomass, nutritional value, bacterial content, and rotifer viability. The diets used were monocultures of Tetraselmis sp., Isochrysis galbana, Pavlova lutheri, and baker's yeast plus capelin oil. Rotifers grown to early stationary phase with equal food rations exhibited equal length distribution, but the rotifer individual biomass was 10–25% higher for yeast-grown rotifers than for algal-grown rotifers. All diets gave equal protein content of individual rotifers. The lipid content was slightly higher and the ratio of protein to lipid was slightly lower with yeast plus capelin oil than with algae. The fatty acid composition of the rotifers was closely related to that of their dietary lipids and the Ω3 fatty acid content was not systematically different for the two types of diets. Use of yeast plus capelin oil resulted in considerably higher numbers of both suspended and rotifer-associated bacteria than with use of algal diets. No differences were found for the algal species involved. The viability of the rotifers in a temperature and salinity test was far better in groups fed algae than in groups fed yeast plus capelin oil. The results indicated an overall better quality of rotifers cultivated with algae than for rotifers cultivated with yeast and oil. Questions related to proteins and the microflora of rotifers should be further emphasized in future research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123431
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of rapid changes in salinity and temperature on the mobility of the rotifer Brachionus plicatilis (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 81-86 
    Details
    ISSN: 1573-5117
    Keywords: Brachionus plicatilis ; locomotion ; temperature ; salinity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The rotifer Brachionus plicatilis can grow in a wide range of salinities and temperatures, but rapid shifts in both salinity and temperature may result in immobilized, non-swimming rotifers. The goal of this study was to examine the effect of perturbations in temperature and salinity on the swimming pattern of the rotifer. Only slight changes in mobility were observed when rotifers were exposed to changes in temperature (from 20 °C to 8–30 °C) and to an increase in salinity (from 20% to 30%). When the salinity was reduced to 15% and 5%, the proportion of mobile rotifers was reduced to 50% and 5%, respectively. The rotifers were throughout more resistant to perturbations in temperature than to those of salinity. Combined temperature and salinity perturbations compared to perturbations in each factor separately suggested a synergetic effect of temperature and salinity on the rotifers locomotion. Transfer from cultivation conditions to low salinity (5%) and high temperature (28 °C) resulted in very low percent of mobile rotifers (0–10%). However, if the temperature was reduced to 8 °C concomitant with the changes in salinity, the percent of mobile rotifers was 85%. Rotifers use a high share of their metabolic energy for locomotion, and it is therefore not surprising that perturbations in salinity and temperature may result in partial or complete immobilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025824
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  • 3
    Electronic Resource
    Electronic Resource
    Dependence of temperature on loss rates of rotifers, lipids, and ω3 fatty acids in starved Brachionus plicatilis cultures (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 13-20 
    Details
    ISSN: 1573-5117
    Keywords: Brachionus plicatilis ; lipids ; ω3 fatty acids ; starvation ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rotifer cultures of Brachionus plicatilis (SINTEF-strain, length 250 μm) rich in ω3 fatty acids were starved for 〉 5 days at variable temperature (0–18 °C). The net specific loss rate of rotifer numbers were 0.04 day−1 (range 0–0.08 day−1) at 5–18 °C, but reached values up to 0.25 day−1 at 0–3 °C. The loss rate was independent on culture density (range 40–1000 ind ml−1), but was to some extent dependent on the initial physiological state of the rotifers (i.e., egg ratio). The loss rate of lipids was 0.02–0.05 day−1 below 10 °C, where the potential growth rate of the rotifer is low (0–0.09 day−1). The loss rate of lipids increased rapidly for higher temperatures where the rotifer can maintain positive growth, and reached 0.19 day−1 at 18 °C. The Q10 for the lipid loss rate versus temperature was higher than the Q10 for respiration found in other strains. This may suggest that other processes than respiration were involved in lipid catabolism. The content of ω3 fatty acids became reduced somewhat faster than the lipids (i.e. in particular 22:6 ω3), but the fatty acid per cent distribution remained remarkably unaffected by the temperature during starvation. The results showed that rotifer cultures could be starved for up to 4 days at 5–8 °C without essential quantitative losses of lipids, ω3 fatty acids, and rotifers. The rotifers exhausted their endogenous lipids through reproduction (anabolism) and respiration (including enhanced locomotion) at higher temperatures. At lower temperatures, the mortality rate became very high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025815
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  • 4
    Electronic Resource
    Electronic Resource
    Particle size dependent feeding by the rotifer Brachionus plicatilis (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 261-267 
    Details
    ISSN: 1573-5117
    Keywords: Brachionus plicatilis ; grazing ; selection ; bacteria ; microbial loop
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Size selective feeding by Brachionus plicatilis was investigated with algae and bacteria (0.3–3.5 µm) and mono-disperse latex beads (0.3–3.0 µm) in short term feeding experiments. B. plicatilis demonstrated maximum clearance rate of particles with diameter ≥2µm, but particles with diameter down to 0.3 µm were also ingested. The clearance rate of bacteria was 15–55% of that obtained for optimal sized particles (≥2 µm), and was related to particle size. The relative reduction in retention of particles with diameter 〈 2 µm was more pronounced for latex beads than for natural food particles, suggesting other mechanisms than size to be important for the particle retention by the rotifer. This is emphasized by the fact that the clearance rates were much lower for latex beads than for natural food particles of comparable size. Efficient retention of bacteria was observed for rotifers in poor physiological condition, i.e. rotifers with low maximum clearance rate. This may reflect a strategy to optimize energy utilization by reducing locomotion costs and increasing energy intake. The results indicate that B. plicatilis has a low to medium ability to feed on bacteria. In natural ecosystems, its importance as a bacterial grazer is of limited importance. At high population densities, such as in live feed cultures, the rotifer may, however, efficiently remove bacteria from the culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025847
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