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MERC ER01-10
19
V. cholerae – No detectable culturable toxigenic Vibrio cholerae were detected in any
samples during any of the trials.
Heterotrophic
Bacteri
a
T0 Ave
cfu/100ml
T0 StDev
cfu/100ml
TF Ave
cfu/100ml
TF StDev
cfu/100ml
Control
2,692
408.14
2136
467
Treated
0.1
0.33
0
0
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).