Hemostats work for me on the difficult ones 95% of the time. The only time I have a problem is if the gills get damaged. Then they bleed profusely and may not survive. Also if the fish manages to get deeply hooked into it's gullet it can be real hard to remove, but it's very rare that it's that deep. If they don't survive, there's always a predatory bird around somewhere ready for a meal, so even then I don't feel real bad.