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| Registros recuperados: 12 | |
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| 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 |
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| Persoone, G.; Claus, C.. |
| The controlled culture of larvae of molluscs of commercial importance (oysters, clams, etc.) till spatfall implies the daily production of substantial volumes of suitable species of microscopic algae. For economic reasons, industrial mollusc hatcheries cannot, however, upscale the very expensive indoor algal production to fulfill the increasing food demands of the growing spat. As too early transplantation of the postlarvae to the natural environment results in various technological and biological problems, the intermediate semi-controlled "nursery" culturing of the spat up to a few centimeters in length is presently more and more preconized. The different technologies utilized for nursery culturing are reviewed with special emphasis on the major problem:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae culture; Mollusc culture. |
| Ano: 1980 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3691 |
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| Claus, C.; Van Holderbeke, L.; Maeckelberghe, H.; Persoone, G.. |
| The controlled nursery culturing of mollusc spat produced to date by millions in commercial hatcheries is an intermediate step in mollusc farming which is receiving more and more attention. Different technologies for nursery culturing indoors as well as outdoors have been developed at different places.The principles are always basically the same and consist of culturing postlarvae of a few millimeters to a size of a few centimeters in densities as high as possible in specific devices containing seawater which is eventually enriched with live unicellular algae or inert foods. This paper reports on the first results obtained in Belgium in an indoor experimental nursery with spat of <i>Ostrea edulis, Crassostrea gigas</i> and <i>Venerupis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mollusc culture; Spat; Bivalvia. |
| Ano: 1981 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3402 |
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| Claus, C.; Maeckelberghe, H.; De Pauw, N.. |
| From October to April the growth of spat of <i>Ostrea edulis, Crassostrea gigas</i> and <i>Venerupis semidecussata</i> 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 |
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| Vanhaecke, P.; Persoone, G.; Claus, C.; Sorgeloos, P.. |
| Although standardization of toxicity tests on aquatic organisms is an urgent necessity, very little has yet been achieved for the marine environment. As a first step in this direction, a simple, inexpensive and reliable short-term routine test with <i>Artemia</i> larvae is proposed. This test is the result of an extensive study in our laboratory, taking into account the advantages and disadvantages of <i>Artemia</i> bioassays published by various authors. The major advantage of the brine shrimp as a test species is its continuous availability under the form of dry cysts which can be hatched very easily; this eliminates all biological, technological, and financial problems of stock recruitment and/or culturing. The acute test... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nauplii; Toxicity tests; Artemia. |
| Ano: 1981 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3711 |
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| Vanhaecke, P.; Persoone, G.; Claus, C.; Sorgeloos, P.. |
| Standardization of toxicity tests on aquatic organisms to detect the impact of chemicals on freshwater or marine ecosystems is an urgent necessity. From the variety of methods, criteria, and test species proposed, simple standardized tests for algae, crustaceans, and fish are now close to being adopted at the international level for the freshwater environment. Despite the same urgency, very little has been achieved for the marine environment. <i>Artemia</i> is an extremely suitable test-species since, contrary to all other organisms, it does not require continuous maintenance of stock cultures. Unfortunately none of the <i>Artemia</i> toxicity tests that have been worked out so far can be adopted as such as a representative standard... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nauplii; Toxicity tests; Artemia. |
| Ano: 1980 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3698 |
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| Sorgeloost, P.; Baeza-mesa, M.; Benijts, F.; Bossuyt, E.; Bruggeman, E.; Claus, C.; Persoone, G.; Van De Putte, G.; Versichele, D.. |
| In view of the need'for research on the practical use of the brine shrimp Artemia salina in aquaaulture, our research team at the State University of Ghent (Belgium) is studying the following aspects : 1- The automatized mass-culturing of larvae. 2- The controlled production of cysts. 3- The comparative study of geographical strains. 4- The study of the metabolism of the cysts. |
| Tipo: Text |
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| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00305/41626/40835.pdf |
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| Claus, C.. |
| La Zoologie a subi dans ces quarante dernières années des transformations profondes. Avec Linné et ses successeurs elle était restée une science purement descriptive. Au commencement de ce siècle, sous la puissante impulsion de Cuvier, elle vit s'ouvrir des horizons nouveaux. Ce grand naturaliste montra, en effet, que tout essai durable de classification devait être basé sur les études anatomiques, et qu'il ne suffisait plus, comme autrefois, de se borner à décrire les formes extérieures de l'animal: c'est en observant avec soin jusqu'aux plus petites particularités de la structure; en combinant les notions ainsi acquises sur l'ensemble des appareils organiques, qu'il arriva à saisir les véritables rapports des êtres et à les grouper suivant les affinités... |
| Tipo: Text |
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| Ano: 1878 |
URL: http://archimer.ifremer.fr/doc/00034/14497/11800.pdf |
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| Claus, C.. |
| Nursery rearing of bivalve molluscs, as the intermediate step between the controlled production of larvae in commercial hatcheries and the growout in the wild, is a practice which is receiving more and more attention in mollusc farming. The purpose of nursery rearing of bivalves is to culture cultchless spat of a few millimeters in size, up to 1-2 cm, in a minimum of time, in densities as high as possible, and at minimal costs and risks. In the last decade various technologies for nursery culturing, indoors as well as outdoors, have been developed at different places, ranging from suspended culture in the open sea to controlled onshore culture in upwelling cylinders. This paper reviews the different systems developed until now, with special emphasis on one... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Experimental rearing; Mollusc culture; Bivalvia. |
| Ano: 1981 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3401 |
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| Registros recuperados: 12 | |
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