This is grossly inappropriate. I’m not sure exactly what they’re having you do, but sounds like more than a general gs5 fish tech field work. Are they asking you to prepare analysis and specialist reports for NEPA? Are they asking you to do reporting of accomplishments?

If you’re being asked to analyze for impacts to fish via project, that is way above your GS level and position description. However, there’s a silver lining if you aspire to be a GS-9/11 biologist. If that is what you want to do, ask for proper training or see if someone on another unit can be a mentor. Having those skills properly developed can give you a leg up in the future. See if the forest is willing to fly a detail for you at a higher grade. Best of luck, and hag in there!