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MERC ER01-10
7
Active Chlorophyll-a
- Chlorophyll is used as ancillary data and as a general
presence/absence indicator of viable photosynthetic organism (MDL = 0.56
µg/l).
T0 Ave
µg/l
T0 StDev
µg/l
TF Ave
µg/l
TF StDev
µg/l
Control
6.27
0.47
0.88
0.05
Treated
0.56
0.00
0.56
0.00
Regrowth Control
2.61
1.59
Regrowth Treated
0.56
0.00
Live Microbes (cfu = colony forming units)
E. coli
T0 Ave
cfu/100ml
T0 StDev
cfu/100ml
TF Ave
cfu/100ml
TF StDev
cfu/100ml
Control
13.6
4.93
0.2
0.45
Treated
0
0
0
0
Enterococci
T0 Ave
cfu/100ml
T0 StDev
cfu/100ml
TF Ave
cfu/100ml
TF StDev
cfu/100ml
Control
11.28
3.05
12.08
5.16
Treated
0
0
0
0
V. cholerae – No detectable culturable toxigenic Vibrio cholerae were detected in any
samples during any of the trials.
Heterotrophic
Bacteria
T0 Ave
cfu/100ml
T0 StDev
cfu/100ml
TF Ave
cfu/100ml
TF StDev
cfu/100ml
Control
547
93.24
613
237.51
Treated
0.9
0.78
1.2
2.45
Discharge Toxicity
Residual Chlorine Analysis -
Levels of residual chlorine (or total residual oxidants -
TRO) were at or below the method detection limit (MDL) of 0.02 ppm in all TF treated samples.
Acute Toxicity -
There were no statistically significant survival effects in any test for
either acutely tested species (Mysid
shrimp or Sheepshead minnows).
Chronic Toxicity
- Results showed that ballast water discharge was not chronically toxic
to either mysids or sheepshead minnows. All samples, however, were chronically toxic to the
marine algal species
Isochrysis galbana
with a statistically significant inhibition in growth in
treated ballast discharge compared to controls
(see details under Summary of Results on page 4).