Consulta: creatorFacets:"De Pauw, N."
Registros recuperados: 19
Data/hora: 16/06/2024 14:56:50

Contribution à l'étude du plankton dans le port d'Ostende
Provedor de dados: 27
Autores: De Pauw, N.
Resuming our proper observations and taking in account the collected data in the literature we can conclude that: (1) diatoms and copepods are the principal components of the Oostende plankton; (2) concentration of zoo- and phytoplankton is highest in summer and autumn; (3) there is a physico-chemical and biological gradient between the front and rear of the port. The gradation is decreasing for salinity, oxygen concentration, pH, number of marine species and the total biomass. The gradient is increasing for temperature and freshwater organisms; (4) several observed species are new to the Belgian coast: 4 copepods, 5 ciliophores, 1 cumacean and 2 diatoms; (5) although the number of species typical for a port is small, several species (observed in large...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community composition Ecology Plankton ANE; Belgium; Oostende Harbour ANE; Belgium; Oostende Harbour; Sluice Dock.
Ano: 1969
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3440

Contributions à l'étude des bactéries marines du littoral belge: IV. Recherche quantitative de la richesse microbienne de l'eau du bassin de chasse d'Ostende par lecture directe sur membranes filtrantes
Provedor de dados: 27
Autores: Persoone, G.; De Pauw, N.
In a series of bi-mensual samplings in 1966, the method of direct counting on membrane filters has been used to determine the quantity of bacteria present in the water of the Sluice-dock in Ostend (Belgium) as a possible important food-stock for oysters which are reared there.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria Community composition Filters Membranes Oyster culture Quantitative distribution Shallow water ANE; Belgium; Belgian Coast ANE; Belgium; Oostende; Sluice Dock.
Ano: 1968
URL: http://www.vliz.be/imisdocs/publications/294746.pdf

Effect of different light regimes on the docosahexaenoic acid (DHA) content of &lt;i&gt;Isochrysis&lt;/i&gt; aff. &lt;i&gt;galbana&lt;/i&gt; (clone T-ISO)
Provedor de dados: 27
Autores: Tzovenis, I.; De Pauw, N.; Sorgeloos, P.
The culture of &lt;i&gt;Isochrysis&lt;/i&gt; aff. &lt;i&gt;galbana&lt;/i&gt; Green (T-ISO) in hatcheries is promoted for its high docosahexaenoic acid (DHA) content which favours the successful rearing of aquatic larvae. In this paper we identified the need for well-defined culture conditions of microalgae if sufficient DHA content is the final goal. Using photoperiods of 24:0h, 12:12h and 16:8h L/D combined with photon flux densities (PFD's) of 110, 220 and 460 µE m&lt;sup&gt;-2&lt;/sup&gt; s&lt;sup&gt;-1&lt;/sup&gt;, batch cultures of T-ISO were sampled for DHA content in the exponential as well as the post-exponential (light-limited) growth phase. The various light regimes resulted in differences of DHA content of T-ISO revealing influences and strong...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodomonas salina.
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2979

Onshore nursery rearing of bivalve molluscs in Belgium
Provedor de dados: 27
Autores: Claus, C.; Maeckelberghe, H.; De Pauw, N.
From October to April the growth of spat of &lt;i&gt;Ostrea edulis, Crassostrea gigas&lt;/i&gt; and &lt;i&gt;Venerupis semidecussata&lt;/i&gt; in an onshore nursery was recorded as a function of water temperature and food level. The results of this study indicate that even very eutrophic water, such as that of the Sluice Dock at Ostend, Belgium, does not provide enough microalgae to sustain growth of bivalve spat during winter, irrespective of whether the water is heated or not. It is necessary to supply additional food (cultured live algae). Food shortage for three months at higher temperature induced a stress situation resulting in high mortality rates, even after transferring all the spat into an optimal combination of temperature and food availability.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture techniques; Rearing; Bivalvia; Molluscs; Belgium.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3369

Mass culture of microalgae in aquaculture systems: progress and constraints
Provedor de dados: 27
Autores: De Pauw, N.; Morales, J.; Persoone, G.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal culture; Aquaculture; Cultivation; Cultivation; Cultivation.
Ano: 1984
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3263

Large-scale microalgae production for nursery rearing of marine bivalves
Provedor de dados: 27
Autores: De Pauw, N.; Verboven, J.; Claus, C.
The feasibility of large-scale bloom induction of nutritionally suited natural phytoplankton species, to feed a semi-industrial nursery of edible shellfish, built on the Belgian coast, was tested. The outdoor microalgal production unit consisted of four tanks of 100 m² surface each (two of 1 m depth and two of 0.5 m depth), equipped with different mixing devices. The cultures were run as chemostats in which seawater was enriched with commercial inorganic N, P and Si fertilizers. Depending on the season, between 5-10 and 80% of the culture volume could be harvested daily, with algal densities ranging from 50,000 to 500,000 cells per ml. By manipulation of operational parameters such as detention time, nutrient levels and nutrient ratios (N: Si: P), unsuited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal culture; Marine aquaculture; Mass culture; Mollusc culture; Rearing; Chaetoceros; Chlorella; Nitzchia; Phaeodactylum; Skeletonema.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3395

Outdoor mass production of marine microalgae for nursery culturing of bivalve molluscs
Provedor de dados: 27
Autores: De Pauw, N.; De Leenheer, L.
Nursery rearing of bivalve molluscs as the intermediate step between the controlled production of larvae in hatcheries and non-controlled growing-out in the wild, is a practice in modern shellfishery management which receives more and more attention. A major bottle-neck in the culturing process of the postlarval bivalves is, however, the production of large quantities of marine microalgae suitable as food for the growing spat. Experience was gained by the authors in small 1 m&lt;sup&gt;2&lt;/sup&gt; outdoor units with induced blooms of natural phytoplankton. The cultures were run either as a turbidostat or as a chemostat with discontinuous or continuous harvesting.Natural seawater (25-32°) was enriched with inorganic (commercial), or organic fertilizers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dominant species Mass culture Mollusc culture Nursery ponds Nutrients (mineral) Yield Bivalvia ANE; Belgium; Oostende; Sluice Dock.
Ano: 1985
URL: http://www.vliz.be/imisdocs/publications/261165.pdf

Milieu en plankton in de Westerschelde
Provedor de dados: 27
Autores: De Pauw, N.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuaries Plankton ANE; Netherlands; Westerschelde.
Ano: 1971
URL: http://www.vliz.be/imisdocs/publications/261741.pdf

Comparison of brackish water plankton assemblages of identical salinity ranges in an estuarine tidal (Westerschelde) and stagnant (Lake Veere) environment (S.W.-Netherlands): 1. Phytoplankton
Provedor de dados: 27
Autores: Bakker, C.; De Pauw, N.
Species composition, abundance and seasonal distribution of the phytoplankton of brackish water ecosystems depend not only on salinity but on several other environmental factors too. In stagnant brackish waters (Lake Veere) the easily established stability of the water masses proved to be an ecological masterfactor in relation to phytoplankton development, equaling salinity in importance. In tidal brackish waters (Westerschelde estuary) turbulence acts as an ecological masterfactor in relation to phytoplankton development, dominating salinity in importance within the chosen salinity ranges.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brackish water Distribution Ecosystems Phytoplankton Salinity ANE; Netherlands; Lake Veere.
Ano: 1974
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3488

A study on the DHA content of T-ISO and its impact on preparing rations for larviculture
Provedor de dados: 27
Autores: Tzovenis, I.; De Pauw, N.; Sorgeloos, P.
Tipo: Info:eu-repo/semantics/article
Ano: 1995
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2644

Heated and unheated outdoor cultures of marine algae with animal manure
Provedor de dados: 27
Autores: De Pauw, N.; Verlet, H.; De Leenheer, L. Jr.
The feasibility was tested of maintaining long-term semi-continuous or continuous cultures of marine planktonic algae such as &lt;i&gt;Chlorella saccharophila&lt;/i&gt; (Krüger) Migula and also algae developing naturally in enriched seawater and which could be suited as food organisms. Diluted aerated swine manure was used as the sole nutrient source for the algae. About 5 liter aerated swine manure per square meter per day x dilution rate per day seemed to satisfy the need of the culture. In view of a possible utilization of thermal effluents, a comparison was made between algal growth in heated and unheated cultures. The experiments were carried out in 250 liter tanks outdoor, equipped with airlift pump. Almost independent of temperature, the algal dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae culture.
Ano: 1980
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3657

Microalgal wastewater treatment-systems: potentials and limits
Provedor de dados: 27
Autores: De Pauw, N.; Van Vaerenbergh, E.
Algae can play a positive role in wastewater treatment by recycling of nutrients, by taking up carbon, nitrogen and phosphorus, by reducing the nutrient load through stripping and precipitation, by producing oxygen for bacterial decomposition of organic matter, by eliminating pathogenic bacteria through bactericide action, and last but not least by solving odor problems. If sufficient insolation, and space are available, intensive algal wastewater treatment-systems proved to be valuable and promising alternatives to conventional treatment systems based on activated sludge or trickling filters. The various technologies developed for algal wastewater treatment are commented in this review. They include simple stabilization-oxidation ponds, as well as more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste water; Wastewater treatment.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3350

Pollution in the harbour of Ostend (Belgium): biological and hydrographical consequences
Provedor de dados: 27
Autores: Persoone, G.; De Pauw, N.
1. Ostend, situated in the middle of the Belgian coast, is a typical seaside resort with a population of 60,000 in the winter and up to 200,000 in summer. All sewage (to the major part raw dornestic sewage, to a lesser extent sewage of industrial origin) flows into its harbour, causing a daily in flow of ca. one part of sewage per 100 parts of harbour  water. This heavy pollution load causes significant physico-chemical and biological consequences. 2. The number of "estuarine" bacteria has increased enormously due to the great daily input of organic matter. The number of coliform bacteria is high; it decreases towards the seaward entrance of the harbour. 3. The beach in the small vicinity of the harbour is polluted. 4. The harbour water contains low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Harbours Pollution ANE; Belgium; Oostende Harbour.
Ano: 1968
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3438

Copepod biomass in an estuarine and a stagnant brackish environment of the S.W. Netherlands
Provedor de dados: 27
Autores: Bakker, C.; Phaff, W.J.; van Ewijk-Rosier, M.; De Pauw, N.
In the mesohaline zone of the Westerschelde estuary &lt;i&gt;Eurytemora affinis&lt;/i&gt; is the dominant copepod, demonstrating large biomass values nearly throughout the year. In the meso-polyhaline Lake Veere &lt;i&gt;Acartia tonsa&lt;/i&gt; is abundant, mainly during summer. In spring a small population of &lt;i&gt;Eurytemora americana&lt;/i&gt; is found. The tidal estuary harboured far denser copepod populations throughout the year than the stagnant brackish lake water. The average yearly copepodid + adult biomass in the Westerschelde estuary was approx. 850 mg/m³ (wet weight), in Lake Veere approx. 130 mg/m³. Temporarily low oxygen values did not influence negatively the copepod populations in the Westerschelde estuary. The seasonal distribution of...
Tipo: Info:eu-repo/semantics/article
Ano: 1977
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3560

On the distribution of &lt;i&gt;Eurytemora affinis&lt;/i&gt;(Poppe) (Copepoda) in the Western Scheldt estuary
Provedor de dados: 27
Autores: De Pauw, N.
In the Scheldt estuary, &lt;i&gt;E. affinis&lt;/i&gt; appeared place-bound, dependent on a direct import from quiet breeding-places in connection with the main stream as in the case of mud-flat-saltmarch systems and on an indirect import as in the case of harbours and sluice-docks. This import explains the place-bound presence in different geographically separated places along the axis of the estuary and its presence at different chlorinities, varying between sea and freshwater (17.9-0.071 promille Cl&lt;sup&gt;-&lt;/sup&gt;). The stream itself did not appear to have its "own" autochthonous population. The facts tend to prove that besides physical characteristics of the system, such as the estuarine circulation and the salinity-distribution, the...
Tipo: Info:eu-repo/semantics/article
Ano: 1973
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3484

Air-lift pumps and the effect of mixing on algal growth
Provedor de dados: 27
Autores: Persoone, G.; Morales, J.; Verlet, H.; De Pauw, N.
Since turbulence is an important factor for the growth of microscopic algae, the effect of mixing intensity and mixing time, has been assessed by means of air-lift pumps as an alternative technology for the agitation of algal cultures. Batch culture experiments in enriched sea water were carried out indoors with &lt;i&gt;Chlorella&lt;/i&gt; in 100 liter tanks and outdoors with natural phytoplankton populations in 70 m³ tanks. The respective culturing depths in these tanks were 25 and 180 cm. The role of the mixing was also evaluated against that of the pH regulation of the cultures. Mixing with air-lift pumps increased the algal growth rate significantly in comparison to non-agitated cultures. The yields were also much higher (up to 30%) in mixed than in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae culture.
Ano: 1980
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3692

Influence of temperature and river discharge on water quality of the Western Scheldt estuary
Provedor de dados: 27
Autores: Somville, M.; De Pauw, N.
Dissolved oxygen concentrations and information on the nitrification process collected respectively during a 14- and a 5-year period in the self-purifying part of the Western Scheldt estuary have been studied. In the polluted part of the stream, ammonium concentrations over the period 1967-1977 have been considered as well. This paper demonstrates the high variability of these three parameters (oxygen, start of the nitrification process, ammonium) owing to the hydrological conditions: temperature and river discharge. Neither the levels of ammonium in the polluted upper part of the stream, nor the concentrations of nitrate and dissolved oxygen in the recuperation part of the Scheldt estuary have been changed significantly during the periods studied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia Estuaries Nitrification Oxygen River discharge Temperature Water quality Belgium; Zeeschelde.
Ano: 1982
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3421

Mass culturing of marine and freshwater algae on aerated swine manure
Provedor de dados: 27
Autores: De Pauw, N.; De Leenheer, L.
Tipo: Info:eu-repo/semantics/article
Ano: 1979
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3627

Use and production of microalgae as food for nursery bivalves
Provedor de dados: 27
Autores: De Pauw, N.
The nutritional value of various foods and diets for juvenile bivalves is reviewed and commented. From all foods tested specific microalgues seem to be the most suited for young bivalves. Presently, serious alternatives for replacing living algae by inert, artificial feeds are practically inexistent, though research efforts are made in this direction. The various microalgae production-systems used for feeding juvenile bivalves are also reviewed. A literature survey and the COST inquiry held in 1979 by our laboratory revealed that nearly all commercial enterprises involved in nursery rearing of bivalve molluscs in Europe utilize natural phytoplankton as food. Culturing of the postlarvae is performed either &lt;i&gt;in situ&lt;/i&gt; (in the sea) or in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae culture; Food; Mollusc culture; Bivalvia.
Ano: 1981
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3406