Fig 1.
Scheme of the experimental set up used for the hypoxia avoidance test.
Fish were gathered in one shadowed side of a circular tank (2.25 m in diameter, 5 m3 in volume) divided into two equal chambers by an opaque divider equipped with a PIT tag antenna surrounding a circular opening (12 cm in diameter). This enabled the monitoring of fish individual movement in a group situation without any disturbance. After 30 min of acclimation, nitrogen was bubbled in the shadowed chamber (called hypoxic chamber in the text) to reduce oxygen level and fish were allowed to freely move to the lit up chamber (called normoxic chamber) with normoxic conditions.
Fig 2.
Scheme of the experimental set up used for the risk taking test sessions.
Fish were gathered in one shadowed side (called safe chamber in the text) of a circular tank (2.25 m in diameter, 5 m3 in volume) divided into two equal chambers by an opaque divider equipped with a PIT tag antenna surrounding a circular opening (12 cm in diameter). This enabled the monitoring of fish individual movement in a group situation without any disturbance. After 30 min of acclimation, fish were allowed to freely move in the lit up chamber (called risky chamber in the text) with normoxic conditions during the next 24 hours with the usual photoperiod used during rearing.
Table 1.
Numbers, proportions, mean body weight and sex ratios of fish characterized by the hypoxia avoidance test, the three sessions of the risk taking test and the mean of the three sessions for all fish correctly assigned and with correct sex data (N = 1155 for hypoxia avoidance test, N = 1154 for RT1 RT2, RT3 and RT_mean).
Table 2.
Heritabilities (h2), genetic correlations and phenotypic correlations estimated for the variables of hypoxia avoidance test using a sire models.
Genetic correlations ± SE are presented above the diagonal, heritabilities h2 ± SE on the diagonal and phenotypic correlations under the diagonal. NE represents non estimable value due to bad model convergence.
Table 3.
Heritabilities (h2), genetic correlations and phenotypic correlations estimated for variables of the three risk taking test sessions using a sire models.
Genetic correlations ± SE are presented above the diagonal, heritabilities h2 ±SE on the diagonal and phenotypic correlations under the diagonal.
Table 4.
Heritabilities (h2), genetic correlations and phenotypic correlations estimated between the variables of hypoxia avoidance test and risk taking test using a sire models.
Genetic correlations ± SE are presented above the diagonal, heritabilities h2 ± SE on the diagonal and phenotypic correlations under the diagonal.