[R] Estimate new values from GLM (familiy=Gamma)

[Antonio Punzon]

Hi, we have this model

glm(CPUE~Year+Month+Length+Year:Month, family=Gamma (link="inverse"))

where, CPUE is a numerical variable >0, We use this model for 
standardization of CPUE and we need the new estimates for each year. How 
can we obtain it?

Thank you