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  • 1
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    Perspectives on marine zooplankton lipids (2007)
    In:  EPIC3Canadian Journal of Fisheries and Aquatic Sciences. 64(11), pp. 1628-1639
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Condition of larval (furcilia VI) and one year old juvenile Euphausia superba during the winter–spring transition in East Antarctica (2016)
    Deep Sea Research Part II
    In:  EPIC3Condition of larval (furcilia VI) and one year old juvenile Euphausia superba during the winter–spring transition in East Antarctica, Deep Sea Research Part II
    Details
    Publication Date: 2016-06-08
    Description: Antarctic krill, Euphausia superba, is an important species in the Southern Ocean ecosystem. Information on krill condition during winter and earlyspring is slowly evolving with our enhanced ability to sample at this time of year. However,because of the limited spatial and temporal data, our understanding of fundamental biological parameters for krill during winter is limited. Our study assessed the condition of Larval (furciliaVI) and one year old juvenile krill collected in East Antarctica (115°E–130°E and 64°S–66°S) from September to October 2012. Krill condition was assessed using morphometric, elemental and biochemical body composition, growth rates,oxygen uptake and lipid content and composition. Diet was assessed using fatty acid biomarkers analysed in the krill. The growth rate of larvae was 0.0038 mm day with an inter moult period of 14 days. The average oxygen uptake of juvenile krill was 0.3070.02 μl Oxygen consumed per mg dry weight per hour. Although protein was not significantly different amongst the krill analysed, the lipid content of krill was highly variable ranging from 9% to 27% dry weight in juveniles and from 4% to 13% dry weight in larvae. Specific algal biomarkers, fatty acids ratios, levels of both long-chain(ZC20) monounsaturated fatty acids and bacterial fatty acids found in krill were in di-Cative of the mixed nature of dietary sources and the opportunistic feeding capabilityof larval and juvenile krill at the end of winter.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    A Developing Country Puts A Halt To Foreign Overfishing (2005)
    Details
    Publication Date: 2021-05-19
    Description: Foreign fishing fleets drastically overfished the waters off Namibia before that country gained independence in 1990, according to Paul Nichols, Special Adviser to the Namibian Ministry of Fisheries and Marine Resources. Since then, the Government has taken strong regulatory actions that have brought overfishing under control and allowed depleted fish stocks to rebuild while gaining strong support for the policy among Namibia's commercial fishers.
    Description: Published
    Keywords: Overfishing
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
    Format: 156326 bytes
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  • 4
    Electronic Resource
    Electronic Resource
    Allyl Ethers of Carbohydrates. I. Preparation and Polymerization of Tetra-allyl α-Methyl Glucoside (1944)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 66 (1944), S. 1625-1627 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01238a004
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  • 5
    Electronic Resource
    Electronic Resource
    Allyl Ethers of Carbohydrates. II. Preparation and Polymerization of Polyallyl Ethers (1945)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 67 (1945), S. 46-49 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01217a015
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  • 6
    Electronic Resource
    Electronic Resource
    Allyl Ethers of Carbohydrates. V. Preparation and Polymerization of β-Methallyl Ethers (1946)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 68 (1946), S. 2020-2022 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01214a045
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  • 7
    Electronic Resource
    Electronic Resource
    Changes in the digestive gland of Euphausia superba during short-term starvation: lipid class, fatty acid and sterol content and composition (1993)
    Springer
    Marine biology 117 (1993), S. 441-448 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During a period of short-term (19 d) starvation, total lipid in the digestive gland of Euphausia superba Dana decreased from 21 to 9% dry weight. Total lipid per digestive gland decreased significantly during starvation compared to Day 0 individuals, falling from 1960 (±172) to 385 (±81) μg. Polar lipid was the major lipid class utilised during starvation, falling from 1510 (±225) to 177 (±46) μg per digestive gland (76 to 45%). Absolute levels of triacylglycerol fell from 300 (±41) to 76 (±5) μg; however, relative levels remained unchanged. The relative level of free fatty acid increased significantly with starvation (4 to 39%) with absolute levels ranging from 79 (±1) to 156 (±20) μg per digestive gland. Absolute levels of all fatty acids per digestive gland declined continually until the end of the starvation period. The long-chain polyunsaturated acids eicosapentaenoic (20:5ω3) and docosahexaenoic (22:6ω3), decreased with starvation from 37 to 26% and 15 to 10%, respectively whereas the saturated fatty acid, palmitic acid (16:0), increased from 15 to 20%. Cholesterol, the major sterol in this organ, increased from 17 (±20) to 44 (±13) μg per digestive gland by Day 3, and by Day 19 had returned to levels found in the digestive gland of Day 0 individuals. Desmosterol followed a similar pattern to cholesterol, increasing from 3 (±1) μg per digestive gland on Day 0 to 11 (±4) μg on Day 3, and falling to 2 (±1) μg on Day 19. Other sterols in the digestive gland, predominantly of algal origin, fell from the levels found in Day 0 individuals to near zero amounts by Day 6. The digestive gland of E. superba plays a dynamic role during shortterm starvation in terms of lipid content and composition. The relative levels of polar lipids, free fatty acids and cholesterol in the digestive gland may provide reliable indices of the nutritional condition of E. superba in the field. Sterols in the digestive gland are indicative of recent dietary composition of krill, and may also be used to quantify dietary input from individual phytoplanktonic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349320
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  • 8
    Electronic Resource
    Electronic Resource
    Biochemical composition of Nyctiphanes australis and its possible use as an aquaculture feed source: Lipids, pigments and fluoride content (1995)
    Springer
    Marine biology 122 (1995), S. 121-128 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nyctiphanes australis contained, on a dry weight basis, an average of 52% crude protein and 5.0 to 9.5% lipid. The fatty acid profile of N. australis was markedly unsaturated, with a mean total ω3 fatty acid content of 48.6±2.4% of total fatty acids. N. australis contained high levels of the essential long-chain polyunsaturated fatty acids eicosapentaenoic (EPA, 20:5ω3) and docosahexaencic (DHA, 22:6ω3), ranging from 16.6 to 36.5% and 11.1 to 24.8%, respectively. The concentration of total carotenoids ranged from 137 to 302 μg g−1 dry wt, with no significant differences in concentrations found with season or life stage. The carotenoids were comprised of 79.5% astaxanthin and 20.5% canthaxanthin. The lipid and pigment compositions of N. australis suggest that the species could serve as a suitable feed source for cultured salmonids. Like other euphausiids, N. australis contained high levels of fluoride, with a seasonal range between 277 and 3507 μg g−1 dry wt. The high fluoride levels found in N. australis would not detract from its potential as a feed source for salmonids because ingested fluoride is largely absorbed by the skeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349285
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  • 9
    Electronic Resource
    Electronic Resource
    Grazing of phytoplankton by copepods in eastern Antarctic coastal waters (1997)
    Springer
    Marine biology 128 (1997), S. 39-48 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chlorophyll a, primary productivity and grazing by copepods on phytoplankton were measured in the upper water column during the summer of 1994/1995 at a coastal site near Davis Station, East Antarctica. Chlorophyll a was at a maximum in mid-December, then dropped markedly as the coastal fast ice melted and broke‐out. Phytoplankton biomass increased again from mid‐ to late‐February. Copepods accounted for at least 65% of zooplankton biomass in the water column before sea ice break‐out, whereas larval polychaetes and ctenophores dominated after ice break‐out. Oncaeacurvata was the numerically dominant species throughout the study. The highest grazing rate (8.7 mg C␣m−3␣d−1) was recorded on 21 December when O.␣curvata accounted for 64% of the total. Grazing had decreased markedly by 28 December (0.9 mg C m−3 d−1); again O. curvata accounted for over 50% of the total ingested. Copepod grazing increased after ice break-out until the last experiment on 20 February (⋍5 mg C␣m−3␣d−1). The main species responsible for grazing during this period were O. curvata, Oithonasimilis, Calanoidesacutus and unidentified copepod nauplii. It was estimated that copepods removed between 1 and 5% of primary productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050066
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  • 10
    Electronic Resource
    Electronic Resource
    Reproductive trade-off in male Antarctic krill, Euphausia superba (1996)
    Springer
    Marine biology 126 (1996), S. 521-527 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Freshly caught male and female Euphausia superba from the same swarm exhibited different rates of mortality subsequent to capture. Mortality was significantly higher for reproductive males (100%, n=68) than for females (3%, n=186) within the first 3 d of capture. Total lipid and triacylglycerol levels in male, female and juvenile Euphausia superba were analysed and compared. All reproductive male krill analysed from this swarm had low lipid levels (1 to 3% dry weight) with negligible triacylglycerol stores (0 to 2% of total lipid). Somatic lipid stores in female and juvenile krill ranged from 8 to 30% of which up to 40% was triacylglycerol. The levels of algal sterols in the digestive gland of males, females and juveniles indicate that all krill had been feeding recently. An analysis of the sex ratio of krill catches derived from data collected over seven summers from the Prydz Bay region showed a decrease in the proportion of males with increasing size. There was a sharp decline in numbers of male krill once they attained a length of 51 to 55 mm. Low lipid levels in redroductive male krill may be due to reproductive costs. The resulting low storage-lipid levels are accompanied by high mortality in male krill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354634
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