Fig. 2
Testicular mRNA levels of androgen and gonadotropin receptors during the first reproductive cycle of Atlantic salmon grilse. Relative mRNA levels of ara1 (a) or ara2 (b) and of fshr (c) or lhcgr (d) are shown. Samples were collected over a period of 17 months during the first reproductive cycle of these 3 year old males (experiment 1). The animals were grouped according to the histological analysis of the most advanced germ cell stage found in the testis (Aund, type A undifferentiated spermatogonia; Adiff, type A differentiating spermatogonia; B, type B spermatogonia; SC/ST, spermatocytes/spermatids; SZ, spermatozoa). The number of individuals analyzed per group is given under the respective bars, showing group means and SEM. Bars sharing the same letter within a given graph are not significantly different (p < 0.05; one way ANOVA followed by SNK post hoc test)