title: [The first stages of genesis of the pelvic fin analage in the trout (Salmo fario and Salmo gairdneri). III. Regulation capacities (author's transl)].
abstract: In S. fario and S. gairdneri, microsurgical excisions of parts of pelvic fin-buds showed the important regulation capacities of the fin anlage. At the stages studied, a complete unilateral excision is generally not followed by a regulatory response. On the contrary, a unilateral partial excision performed at the same developmental stages is followed by a regulatory response. Bilateral excision of the fin-buds, performed at earlier developmental stages than unilateral ones (and at a slightly different level for mesoderm) are followed by regulation. The results are discussed in this article. It appears that the mesoderm is a determining factor in the development of the fin-buds; the epidermis does not appear influential - at least in the first stages of regulation. We noticed a higer percentage of regulation in S. gairdneri than in S. fario; the results obtained are analysed with regard to histoenzymological data.
mesh_terms: D000818:Animals; D005121:Extremities / Q000196:embryology; D006706:Homeostasis; D008648:Mesoderm / Q000502:physiology; D009024:Morphogenesis; D012487:Salmonidae / Q000196:embryology*; D014337:Trout / Q000196:embryology*
vernacular_title: Les premiers stades de la formation de l'ébauche de nageoire pelvienne de truite (Salmo fario et Salmo gairdneri) III-Capacités de régulation