Stream Ecology
Temperature / pH / Dissolved Oxygen
The maximum amount of DO Temperature Ranges for Aquatic Life
that can occur in water at a    
specific temperature is listed More than 20 C (68 F):  
below. Many plants, bass, crappie, bluegill, carp, sucker,
    caddis fly larvae, many fish diseases
C F DO (ppm)    
    20 - 14 C (68 - 57 F):  
0 32 14.6 Some plant life, trout, walleye, northern pike, stonefly
1 34 14.2 nymph, caddisfly larvae, water beetles, water striders,
2 36 13.8 some fish diseases  
3 37 13.4    
4 39 13.1 Less than 14 C (57 F):  
5 41 12.8 Few plants, trout, caddisfly larvae, stonefly nymph,
6 43 12.4 mayfly nymph, few fish diseases
7 45 12.1
8 46 11.8
9 48 11.5 Dissolved Oxygen Requirements for Native Aquatic Life
10 50 11.3    
11 53 11.0 Trout spawning . . . . . . . . . . . . . . . . . . . . . 7 ppm and up
12 54 10.8 Trout growth and well-being . . . . . . . . . . . . 6 ppm
13 55 10.6 Bass and crappie growth and well-being . . . 5 ppm
14 57 10.3
15 59 10.1
16 61 9.9 pH Ranges that Support Aquatic Life
17 63 9.7 1 2 3 4 5 6 7 8 9 10 11 12 13 14
18 64 9.5    
19 66 9.3 Bacteria: 1.5_____________________________________13.5
20 68 9.1    
21 70 8.9 Plants: 6.5________________12.0
22 72 8.8    
23 73 8.6 Carp,suckers,catfish: 6.0_______9.0
24 75 8.5    
25 77 8.3 Bass, crappies: 6.5____8.5
26 79 8.2    
27 81 8.0 Snails, clams, mussels: 7.5__9.0
28 82 7.9    
29 84 7.7 Trout, aquatic invertebrates: 6.5_7.5
30 86 7.6 (most mayfly, stonefly, and caddisfly nymphs)