Hello and welcome to HCM.
Thank you for your query.
A lot of details have been mentioned in your query, but although you feel it irrelevant I would have preferred knowing your sexual status and history; and the most basic information: AGE and SEX. I still do not know whether you are male or female. But shall try my best to help you with as much information as I can possibly provide.
The reason why this information is important is because, a fishy smelling urine is usually the indication of sexually transmitted infections like:
trichomoniasis, etc; if you are a female then along with trichomoniasis,
bacterial vaginosis is also a strong possibility. But, this can also occur in individuals who have a problem relating to hydration. As you have mentioned a strenuous backpacking trip recently, there is a strong possibility of you not being able to consume sufficient amount of fluids during this particular trip which has resulted in
dehydration and the fishy smelling urine.
If you are male and your recent sexual history is close to nil, then this is most probably just a hydration problem which will be resolved by drinking as much water as your possibly can and to maintain your fluid intake. But if you have a positive recent sexual encounter, and if you noticed your sexual partner (female) to also have a similar smell/odor from her vagina, then this could be a sexually transmitted infection.
If you are a female and your urine/vagina smells fishy without a recent sexual encounter then please consume plenty of water, but if your sexual history is positive for a recent sexual encounter, you will have to consider the possibility of a sexually transmitted infection.
For your reference I shall list a few other symptoms of an infection:
-Burning sensation while urinating
-Frequent urination
-Increased urge to urinate, but less amount of urine passed
-Chills
-Fever
-Lower abdominal and/or flank region pain
-Itching around the genitals
-Blood in urine or immediately after (not always seen)
-Penile or
vaginal discharge I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://doctor.healthcaremagic.com/doctors/dr-shoaib-khan/64581 . I would gladly help you.
Best wishes.