I want to sample  macro invertebrate  and look for species that need high 
concentrations of DO , such as mayfly , stonefly and caddisfly and trout. 
My hypothesis is that stream reach below dam will have macro invertebarates 
that thrive in low DO and stream above the dam would have macro 
invertebrates that trive in high DO. My constriants are that 1) I have not 
done  done  macro invertabrate sampling, 2)  I will doing sampling by 
myself. 3) Surber sampler is quite expensive. Can you please guide me how I 
should do the macro invertabrates sampling? and from Where I can get a 
Surber sampler for cheap , my budget limit is $ 70. 
I will really appreicate your help 
Thanks 
Nadeem kazmi 

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