skinny snake

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Hey guys I just got a female salmon and she is a hair over 4 ft. and she is feeding on small rats. I think she is probly a late 09 but she seems very thin to me. So here is my question about what size/weight should she be given her length and approximate age. Second question is outside of just feeding her more often what are some ways to help her gain a little more quickly if she is a little under weight?

Thanks guys....the Griz.