Wr is a guide line and can be used to judge the growth of a fish. It will tell you if there is the right amount of forage for a fish to grow. Low Wr/Rw means the weight for the length of the fish did not have the right size or the right number of forage to eat. If a fish is under weight it means you need more forage. There are exceptions to the rule, like when a fish is in poor condition due to other factors, blind in one eye or the fish or maybe stunted, big head or head to close to the tail
. Your personal experience (go with your gut feeling) around the fish you are growing will also give some clues whether to cull or not to cull, that is the question sometimes answered from ones experience. Hope this helps
