| Type |
Proceedings paper |
| Date |
1984-11 |
| Language |
English |
| Author(s) |
Maestrini S, Robert J |
| Meeting |
Production et relations trophiques dans les ecosystemes marins. Yalta 27 Octobre-2 Novembre 1984 |
| Source |
Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1984 |
| Keyword(s) |
Bacillariophyceae, Bivalvia, Biomass, Pond culture, Algal settlements, Oyster culture, Nutritive value, Dissolved organic nitrogen |
| Abstract |
Microalgal population of oyster ponds is dominated by several tychobenthic diatoms which provide a very good food to grow oysters. The mechanisms which allow them to dominate have been put under research. H.P.L.C. analysis demonstrated 17 amino acids amounted 10-17% of total DON, i.e. 0.6-11.5 mu g-at/l nitrogen. Serin and glycin were the most abundant. None of the substances was related to the presence of oyster. Glutamic acid, alanin and ornithin concentrations showed the greatest variations; they are suspected to play the major role as nutrient source. Screening of nutritional capabilities of ten local isolates of micro-algae to use 42 organic substances as sole source of nitrogen, demonstrated urea, glutamic acid and hypoxanthin are assimilated by all the ten algae, yet urea alone always supports a growth as good as the one showed with NO sub(3). Other good sources are guanin, ornithin and glycin. Most of the substances, however, are taken up and assimilated by a few strains and subsequent growth is light. |
| Full Text |
| File |
Pages |
Size |
Access |
| acte-1531.pdf |
30 |
4 MB |
Open access |
|
