The effectiveness was studied of different hormonal treatments to induce gamete emission in a wild stock of a European baitfish, the gudgeon ( Gobio gobio L.). Ovulation was induced by injection of a hypothalamic factor, the luteinizing hormone-releasing hormone superactive analog (D-Trp 6, des Gly 10-LHRH), in combination with pimozide (PIM), a dopamine antagonist, or by injection of a carp pituitary extract (CPE). More than 60% of treated females ovulated after injection of CPE (10.0 μg/g) and nearly 100% after injection of PIM+LHRH-A. There was a large variability in the time between injection and stripping and in fertilization success. Hatching rate varied between 0 and 95% and there was no relationship with latency time or ovulation index. Different techniques are proposed to resolve these problems.