Full up

Please, who can help me! I would like to know what means the expression " to catch your fill",which context follows below:
And if you like catching trout, make plans for a trip to Gaston's to catch your fill.
Thanks, HCD

We usually use "fill" as a verb, as in "Fill it up with high test".
But fill also functions as a noun which it is in this case.
Fill means "a quantity that satisfies or satiates".
So go and "make plans for a trip to Gaston's to catch a quantity of trout that satisfies or satiates you".

More often about food. Eat your fill - eat until you are full up.