Abnormal pituitary‐gonad function in two feral populations of goldfish, Carassius auvatus (L.), suffering epizootics of an ulcerative disease

Abstract. The activity of the pituitary‐gonad axis was examined in goldfish, Carassius auratus (L.), collected from two populations exhibiting epizootics of an ulcerative disease. One population, collected from a pond in Toronto, Ontario, exhibited a significant linear relationship between the extent of lesions and the ovarian state. In a second population, collected from Hamilton Harbour, Lake Ontario, there was no correlation between the high …