| one publication added to basket [4840] | Feeding experiments with Mytilus edulis L. at small laboratory scale: 2. The influence of silt in addition to algal suspensions on growth
Winter, J.E. (1976). Feeding experiments with Mytilus edulis L. at small laboratory scale: 2. The influence of silt in addition to algal suspensions on growth, in: Persoone, G. et al. (Ed.) Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 1. Research in mariculture at laboratory- and pilot scale. pp. 583-600
In: Persoone, G.; Jaspers, E. (Ed.) (1976). Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 1. Research in mariculture at laboratory- and pilot scale. European Marine Biology Symposia, 10(1). IZWO: Wetteren. ISBN 90-6281-001-2. 620 pp., meer
In: European Marine Biology Symposia., meer
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Documenttype: Congresbijdrage
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| Abstract |
The influence of suspended silt in addition to unicellular algal cells (Dunaliella marina Butcher) on the filter-feeding activity and growth of Mytilus edulis L. has been investigated. The feeding experiments have been carried out at two different feeding regimes; feeding at six daily and constant additions of food and/or silt at 4 hr intervals, and feeding at constant concentrations. The feeding experiments with six additions/day showed that suspended silt from 2.5-100 mg/l (initial concentrations) in addition to algal cells, has no influence on the increase in tissue weight, whereas the shell weight increases with increasing amounts of silt presented. This increase is possibly caused by a substance within the silt suspension necessary for shell formation. The feeding experiments at constant concentrations, within the range of optimal cell concentrations (20x106 - 40x 106 cells/l), showed that the filter-feeding activity, the amount of food ingested and the growth observed are greatly increased by the amount of silt (12.5 mg dry wt/l) presented. The highest increase in dry-tissue weight (88.8 % after 26 days) was obtained with suspended silt and a concentration of 40 x 106 cells/l. This increase in dry-tissue weight is increased by 32 %, compared with the corresponding increase obtained at the same food level but without suspended silt. Such an accelaration of growth is of fundamental importance for culturing mussels, especially in colder regions, where overwintering is necessary and costly. |
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