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Freshwater Macroinvertebrate Survey
(Based in part on the FDEP Biorecon protocoland Izaak Walton League of America)
Site:___Little Manatee River – Camp Bayou site #251
Date:__4/16/04_____________ Sampler's name:_Dolly with help from
Ruskin Elementary 5th gr classes
Habitat Number of sweeps
Snags/ woody debris ___1
rock/ shell rubble ___1
leaf packs or mats ___1
vegetation ___1
Site appropriate for invertebrate collection _____
Use the following letter codes to record the relative amounts of organisms
found in your 4 sweeps. Now add up the number of letters in each column
and multiple by the indicated value.
R (Rare)= 1 - 3
C (Common) = 4 - 10
A (Abundant) = 10 - 30
D (Dominant) = > 30
Sensitive SOMEWHAT SENSITIVE TOLERANT
hellgrammite ____ clams __c_ leeches __r_
mayfly nymphs _c__ crayfish __r_ midge larvae __a_
riffle beetle ____ damselfly nymphs __c_ pouch snails ____
stonefly nymphs ____ dragonfly nymphs __r_ worms ____
caddisfly larvae ____ amphipods __a_
isopods ____
gilled snails __r_
beetle larvae __r_
shrimp __r
blackfly larvae ____
# of letters X 3 = _3__ # of letters X 2 = _16_ # of letters X 1 = _2__
Now add together the 3 values to get your total index value = _21__
The total index value will give you an indication of the water quality of your stream.
Good water quality is reflected by a variety of different organisms,
with no one kind making up the majority of the sample.
WATER QUALITY RATING
Excellent (>24) ____ Good (19-24) __X_ Fair (12-18) ____ Poor (<12) ____
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