MOSFET: How can I find conduction parameter and transconductance based on graphs?
Transconductance is a volt to amp ratio of the change in input voltage to change in output current when in saturation (constant current) mode: -



Transconductance at the area shown above is approximately (9-7)volts/4 mA = ~500. At lower gate voltages, transconductance is more because the change in \$I_D\$ is less.

I'm unsure what you mean by "conduction parameter". Maybe you can link to some reference material.