Figure 4From: Sex differentiation in Atlantic cod (Gadus morhua L.): morphological and gene expression studiesIn situ hybridization for vasa mRNA in Atlantic cod gonads. a) Testis tissue of a fish of 34 mm TL; b) ovarian tissue of a fish of 32 mm TL, OC – ovarian cavity; c) In a mature (adult) testis (positive control); d) In a maturing testis using sense probe (negative control). Arrows indicate positive oogonia/spermatogonia in a) and b); arrowheads show type A spermatogonia in c, BSpg – type B spermatogonia; Sc – spermatocytes.Back to article page