Triploids presented higher survival rates than diploids Increased growth rate and survival in the triploids is its effect on final yield of oyster “meat”.

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Presentation transcript:

Triploids presented higher survival rates than diploids Increased growth rate and survival in the triploids is its effect on final yield of oyster “meat”.

Selection for faster growing oysters is another strategy that can provide a practical method for managing around Dermo infections (but not MSX disease A diferença entre diploides e triploides baseia- se apenas na diferença de salinidades. A grande diferença reside nas tetraploides “produzidas” por hibridação XB com DBY – 4DXB, apresentando estas maior resistencia as doenças.

genetic polymorphism in early life-history seems to range between two extreme genetically-based “strategies”: (1) fast growing larvae settling large but experiencing low settlement success and poor growth and survival after settlement (2) slow growing larvae settling small but experiencing higher settlement success and better growth and survival after settlement. (Taris et al., 2006). On a population with these extremes, size selection by culling slow growing larvae would lead to reduced settlement success, and reduced growth and survival after settlement. However, positive phenotypic relationships were shown between larval and spat growth in both C. virginica and C. gigas

Allen, S., Gaffney,P., Ewart, J. (1993). Genetic Improvement of the Eastern Oyster for Growth and Disease Resistance in the Northeast. Aquaculture center, 210. Virginia Institute of marine Science. (2010).The Aquaculture Genetics and Breeding Technology’s. Taris, N., Ernande, B., McCombie, H., Broudry, P. (2006). Phenotypic and genetic consequences of size selection at the larval stage in the Pacific oyster (Crassostrea gigas). Journal of Experimental Marine Biology and Ecology. 333, 147–158