|Selecting flat oysters, Ostrea edulis, for survival against the parasite Bonamia ostreae: assessment of the resistance of a first selected generation|
|Martin, A.G.; Gérard, A.; Cochennec, N.; Langlade, A. (1993). Selecting flat oysters, Ostrea edulis, for survival against the parasite Bonamia ostreae: assessment of the resistance of a first selected generation, in: Barnabé, G. et al. (Ed.) (1993). Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. EAS Special Publication, 18: pp. 545-554|
|In: Barnabé, G.; Kestemont, P. (Ed.) (1993). Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. EAS Special Publication, 18. European Aquaculture Society: Gent. 587 pp., more|
|In: EAS Special Publication. European Aquaculture Society, more|
Introduced species; Oyster culture; Parasites; Ostrea edulis Linnaeus, 1758 [WoRMS]; Marine
In 1989, a selected strain of flat oyster, Ostrea edulis, was produced from breeders that survived Bonamia ostreae and that were overselected by injection of purified parasites. This generation (G1) was compared to native oysters which had settled during the same year. After a growing period of 21 months, the oysters were tested according to three procedures: exposure to natural infection in an intertidal area, maintenance at the laboratory in tanks near heavily infested oysters, injection of parasites. The test lasted 7 months. In each procedure, oysters of the first generatjon (G1) showed a better survival rate than control oysters (72 to 94% versus 48 to 66%). On the other hand, the highest mortalities were observed among injected oysters (G1 and controls). In the laboratory tests, however, infestation rates of surviving oysters were equal or even higher in G1 than in the controls. This reduces the gain of resistance, regarding the number of non- infested survivors. Nevertheless, the difference remains significant between oysters overselected by inoculation and their controls (49% versus 32%). This confirms that the injection technique may provide faster assessment of disease resistance and also may be used for overselection. Survivors of the overselected first generation have been kept to produce a second generation (G2).