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Contributions towards a specific DHA enrichment in the live food <i>Brachionus plicatilis</i> and <i>Artemia</i> sp. OMA
Dhert, Ph.; Sorgeloos, P.; Devresse, B..
This paper reports on enrichment techniques oriented towards a specific DHA accumulation in the live prey <i>Brachionus plicatilis</i> and <i>Artemia sp.</i> The product used in these experiments (DHA7) is an experimental emulsion with a DHA/EPA ratio 6.7:1. Rotifers enriched with this pure DHA7 emulsion contained up to 69 mg/g DW DHA and a DHA/EPA ratio of 1.6. The DHA/EPA ration could be increased to a much higher level by different enrichment techniques. Dilution of the DHA7 emulsion with coconut oil prior to enrichment also had a beneficial effect on the DHA/EPA ratio of the rotifers. Using a mixture DHA7/coconut oil 3:7 the DHA/EPA ratio could be raised to 4.9. In <i>Artemia</i> DHA levels were slightly influenced...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia; Brachionus plicatilis.
Ano: 1993 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2688
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Dietary ascorbic acid requirements during the hatchery production of turbot larvae OMA
Merchie, G.; Lavens, P.; Dhert, Ph.; Garcia Ulloa Gómez, M.; Nelis, H.; De Leenheer, A.P.; Sorgeloos, P..
The effect of the high ascorbic acid (AA) levels transferred through enriched live food was evaluated for turbot <i>Scophthalmus maximus</i> larvae in two consecutive feeding experiments. The same feeding strategy was applied to all treatments, except for the AA content in the live food which was manipulated through bioencapsulation with ascorbyl palmitate. This resulted finally in a low, medium and high-AA treatment. The AA incorporation levels in the turbot larvae (up to 1400 µg AA g DW<sup>-1</sup>) were correlated with the AA content of the live food administered. However, feeding the high AA concentration resulted in the same values as for the medium treatment, indicating a saturation of the body AA reserves. Under standard...
Tipo: Info:eu-repo/semantics/article
Ano: 1996 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3022
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Effect of broodstock nutrition on the quality of turbot (<i>Scophthalmus maximus</i>) eggs and larvae OMA
Dhert, Ph.; Lavens, P.; Bijnens, R.; Brunel, A.; Merchie, G.; Sorgeloos, P..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scophthalmus maximus (Linneaus; 1758).
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2551
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High-density production of the rotifer <i>Brachionus plicatilis</i> in a recirculation system: consideration of water quality, zootechnical and nutritional aspects OMA
Suantika, G.; Dhert, Ph.; Nurhudah, M.; Sorgeloos, P..
Rotifers were reared on the artificial diet culture Selco® in batch and recirculation conditions at different water exchange rates. The different rearing conditions resulted in considerable changes in water quality, which in their turn affected rotifer growth and food consumption. At a daily water exchange rate of 100%, no positive effect was obtained in rotifer growth compared to the batch rearing system, but the rotifer culture period could be prolonged by 1 week. By increasing the daily water exchange rate from 100 to 300% the maximum rotifer density could be significantly (<i>P</i> < 0.05) increased from 1800 to 2500 individuals ml<sup>-1</sup>. At the highest recirculation rate (daily water exchange of 500%) the highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquaculture systems; Batch culture; Population density; Recirculating systems; Water quality; Zooplankton culture; Brachionus plicatilis; Rotifera.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=44
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Improvements in the larviculture of turbot <i>Scophthalmus maximus</i>: zootechnical and nutritional aspects, possibility for disease control OMA
Dhert, Ph.; Lavens, P.; Dehasque, M.; Sorgeloos, P..
The rotifer feeding regime for larval turbot could be improved by more regular feeding and adjusted food distributions as to prevent overfeeding and digestion problems. All tests were successfully run in clear-water conditions indicating that the administration of algae is not essential during the rotifer stage. Larval requirements with respect to (n-3) RUFA, and more specifically DRA and DRA/EPA ratio appeared to change according to the age of the larvae and the physiological condition at the different larval stages. As early as the first week the stress resistance of the larvae could be improved by feeding rotifers specifically enriched in DRA. However, the continuous feeding of these live preys did not result in the best larval output, indicating that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scophthalmus maximus (Linneaus; 1758).
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2553
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Larviculture of marine finfish: the current status OMA
Sorgeloos, P.; Dehasque, M.; Dhert, Ph.; Lavens, P..
Tipo: Info:eu-repo/semantics/article
Ano: 1994 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2670
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Live feeds in aquaculture OMA
Dhert, Ph.; Sorgeloos, P..
Over the past two decades intensive larviculture of several fish and shellfish species has expanded into a multimillion dollar industry. Although much progress has been made in identifying the dietary requirements of the larvae of various aquaculture species, the mass culture of their early larval stages still requires the use of live feeds. Selected either through trial and error approaches or because of their convenience in mass production and use, hatcheries are relying today on three groups of live feed, i.e. various species of microscopic algae, the rotifer <i>Brachionus</i> and the anostracan brine shrimp <i>Artemia</i> .Various species of microalgae are used in feeding mollusc and shrimp larvae and/or in greenwater fish...
Tipo: Info:eu-repo/semantics/article
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2558
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Live food mediated vitamin C transfer to <i>Dicentrarchus labrax</i>and <i>Clarias gariepinus</i> OMA
Merchie, G.; Lavens, P.; Dhert, Ph.; Pector, R.; Mai Soni, A.F.; Nelis, H.; Ollevier, F.P.; De Leenheer, A.P.; Sorgeloos, P..
Live food enrichment techniques, using formulated diets and emulsions for improving the nutritional quality of <i>Brachionus</i> and <i>Artemia</i> , were studied as a tool for transferring ascorbic acid (AA) to fish larvae. <i>Artemia</i> nauplii enriched for 24h with an experimental emulsion containing 20% HUFA and 0%, 10% and 20% ascorbyl palmitate (AP) were administered to catfish larvae in a 20-day feeding trial. Survival was not affected by the dietary AA, but from day 7 onwards a significantly positive effect of supplemental AA on growth was demonstrated. At the end of the experiment the 20% AP group weighed 30% more than the control (0% AP), i.e. 9.5 and 6.3mg DW, respectively. Evaluation of the physiological...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clarias gariepinus Dicentrarchus labrax (Linnaeus; 1758) [Bass].
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2581
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Production and evaluation of resting eggs of <i>Brachionus plicatilis</i> originating from the P.R. of China OMA
Dhert, Ph.; Schoeters, K.; Vermeulen, P.; Sun, J.; Goa, S.; Shang, Z.; Sorgeloos, P..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachionus plicatilis Müller; 1786.
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2557
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Progrès dans la larviculture des poissons grâce à une meilleure nutrition et à l'amélioration des zootechnies OMA
Dhert, Ph.; Lavens, P.; Dehasque, M.; Sorgeloos, P..
Tipo: Info:eu-repo/semantics/article
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2555
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Rearing techniques for difficult marine fish larvae OMA
Dhert, Ph.; Divanach, P.; Kentouri, M.; Sorgeloos, P..
In finfish mariculture, seed production and larval rearing still form the bottleneck for all ongrowing operations and are considered as the main limiting factor for industrial development. Through trial and error more than through biological understanding two opposite hatchery techniques have been developed which surprisingly control a multiparametric combination of different factors but aspire to the same objective of conformity with wild standards and the cost-effective production of larvae. In intensive aquaculture, the rearing technique is characterised by high initial larval densities in small tanks under strict hydraulic, thermic, and nutritional conditions. The light conditions are artificial. The temperature and quality of water are controlled. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquaculture techniques; Environmental conditions; Fish eggs; Fish larvae; Food organisms; Industrial production; Marine fish; Rearing; Seed (aquaculture); Artemia; Brachionus plicatilis; Pisces [Fish].
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=301
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Review of some aspects of marine fish larviculture OMA
Sorgeloos, P.; Dehasque, M.; Dhert, Ph.; Lavens, P..
Dependable availability of quality fry to stock grow-out production systems has been one of the most critical factors in the commercial success of industrial production of fish and shellfish. Large-scale production of marine fish fry was realized only from the 1980s onwards. Although Japan was the pioneer with the red sea bream (<i>Pagrus major</i>), the most competitive hatchery methods were eventually developed in Europe for the sea bass (<i>Dicentrarchus labrax</i>) and the gilthead sea bream (<i>Sparus aurata</i>). Improved knowledge of larval dietary requirements, not the least with regard to (n-3) highly unsaturated fatty acids (HUFAs), combined with the adoption of live-food enrichment protocols allowed the...
Tipo: Info:eu-repo/semantics/article
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2627
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Use of a potential probiotic <i>Lactococcus lactis</i> AR21 strain for the enhancement of growth in the rotifer <i>Brachionus plicatilis</i> (Müller) OMA
Shiri Harzevili, A.R.; Van Duffel, H.; Dhert, Ph.; Swings, J.; Sorgeloos, P..
The effect of a potential probiotic on the growth performance of a rotifer and its inhibition against <i>Vibrio anguillarum</i> was studied. Probiotic strain AR21 had no significant observable effect on the growth rate of rotifers under optimal culture conditions in three consecutive experiments. In the first and second experiments, the AR21 strain exhibited an inhibitory effect against the <i>V. anguillarum</i> strain when rotifer cultures were maintained at a suboptimal feeding regime. The growth rate of the rotifers in suboptimal feeding conditions was significantly higher in the treatment receiving AR21 and <i>V. anguillarum</i> than in the treatment where only <i>V. anguillarum</i> was added.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth Probiotics Rotifera Brachionus plicatilis Müller; 1786 Lactococcus lactis.
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=317
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Use of ongrown <i>Artemia</i> in nursery culturing of the tiger shrimp OMA
Dhert, Ph.; Bombeo, R.B.; Sorgeloos, P..
Juvenile and adult <i>Artemia</i> produced in a semi flow-through culture system were used as food for postlarval shrimp. The growth performance of shrimp reared on such ongrown <i>Artemia</i> live prey is identical to the growth obtained when feeding newly hatched <i>Artemia</i> . However, a significantly better stress resistance is obtained when the postlarvae are exposed to a low salinity in a stress test. Besides nutritional and energetic advantages, the use of <i>Artemia</i> biomass for feeding postlarval shrimp also results in improved economics as expenses for cysts and weaning diets can be reduced.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia.
Ano: 1993 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2686
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Variation of ascorbic acid content in different live food organisms OMA
Merchie, G.; Lavens, P.; Dhert, Ph.; Dehasque, M.; Nelis, H.; De Leenheer, A.P.; Sorgeloos, P..
Ascorbic acid (AA) is an essential nutrient in particle and live aquafeeds. In order to better assess the needs for this nutrient during larviculture the AA content of algae, rotifers and <i>Artemia</i> was studied with respect to their suitability at startfeeding. In general, the microalgae evaluated were rich in AA (1000-4000 µgAA/gDW), but showed a considerable variability among the different species: e.g. the concentration in <i>Isochrysis</i> and<i>Chlorella</i> reached values 3-to 4-fold the percentage of <i>Tetraselmis</i> (0.11% of DW). <i>Brachionus</i> routinely cultured on <i>Chlorella</i> contained 2300 µg AA/gDW. Cysts of various batches and strains of...
Tipo: Info:eu-repo/semantics/article
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2578
Registros recuperados: 15
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