Table 1. Test species. 
Capture location? 
Species 
Scientific name Common name Capture method? 
Menhaden 
Brevoortta tyrannus H.S. 
Anchoa mitehillt Bay anchovy H.S. 
Fundulus majalis Striped killifish H.S. 
F. heteroclitus Mummichog H.S. 
Rissola marginata Cusk eel H.S. 
Mentdia menidta Atlantic silverside H.S. 
Morone saxatilis Striped bass O.T. 
Morone americana White perch O.T. 
Letostomus xanthurus Spot 0.T. 
Micropogon undulatus Croaker 0.T. 
Cynoscion regalis Weakfish H.S. 
Trinectes maculatus Hogchoker O.T. 
Pomatomus saltatriz Bluefish H.S. 
GRID ESS Oystenitoade ish. wie 
lfrom American Fisheries Society Special Publication No. 6. 
2Del., University of Delaware Bayside Laboratory, Lewes, Delaware. 
P.R., Patuxent River estuary, Maryland. 
3H.S., 15.24-meter beach seine. 
0.T., 6.096-meter otter trawl pulled at 3 knots for 3 to 5 minutes, 
acid-extractable cations (see App.). Since water temperature and salinity 
at the Bayside Laboratory fluctuated with tides, the fish were tested at 
a median temperature of 22° + 2° Celsius and at the same salinity as that 
at the time and place of capture. Salinity range during testing was 18 
to 30 parts per thousand (9/00). 
The fish at Hallowing Point were captured in water of 4 to 6 °/oo 
salinity over a temperature range of 15° to 27° Celsius. Tests were con- 
ducted at approximately 5.5 °/oo salinity and at 25° + 2° Celsius. 
3. Bioassays Using Resuspended Natural Sediments. 
All natural sediment bioassay tests were made at Hallowing Point. 
Sediment was obtained in 6.1 meters of water near Long Point in the 
Patuxent River estuary. Several samples were obtained at one time and 
were mixed before use. Although the same batch of sediment was not used 
in all tests, results using different sediment batches were repeatable. 
Natural sediments were kept in polyethylene containers and were covered 
with saline water (4 to 6 °/oo). 
Natural sediments were added to test tanks as a mud-water slurry. 
Test tanks were partially filled with the slurry, and the concentration of 
solids was determined. The slurry was then diluted with filtered river 
water to obtain the desired test concentration. 
