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Factors leading to thallus disintegration and the control of these factors in Gracilaria sp.
Friedlander, M.; Gunkel, W. (1992). Factors leading to thallus disintegration and the control of these factors in Gracilaria sp., in: Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17: pp. 221-243
In: (1992). Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17. European Aquaculture Society: Oostende. ISBN 90-71625-11-7. 360 pp., more
In: Spec. Publ. Eur. Aquacult. Soc, more

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Keyword
    Marine

Authors  Top 
  • Friedlander, M.
  • Gunkel, W.

Abstract
    Thallus disintegration, which had appeared in experimental seawater ponds of Gracilaria conferta, started with a white tip disease. The major environmental factors which induced its appearance were high temperature, high plant density and lack of aeration. Several strains of agar degrading bacteria were isolated from the sick tips and used succesfully to infect healthy Graciliaria. A stepwise involvment of several bacterial strains was found in the disease development, and various interactions between them were determined in pure culture. Marine yeasts and a virulent bacterial strain were presumably involved in an antibacterial effect in pure cultures of agar degrading bacteria and in Graciliaria cultures. Bacteria strains isolated from a second brown spot disease infected healthy Graciliaria, causing the white tip disease. However, the unique conditions and factors involved in the second disease have not yet been isolated.

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