Fig. 3. Unsaturation index of polar lipids in oysters as a function of (A) their origin and (B) time x temperature. Oysters were collected in the field or produced in the hatchery. Five males and 20 females were mated to produce animals in the pooled group (Pool) whereas F_x represents full-sib families. Data are means ± s.e.m., n=3 aquaria. Different letters indicate significant differences.