Tests were conducted to determine (1) the acute (96-hour) toxicity of hexachlofobenzene (HCD) to pink shrimp (Penaeus duorarum), grass shrimp (Palaemonetes pugio), sheepshead minnows (Cyprinodon variegalus) and pinfish (lAgodon rhomboides) and (2) the rate of HCD uptake and depuration by pinfish. Hexachlorobenzene was not acutely toxic to any of the animals tested at measured concentrations in sea water to 25 ug/1. However, both species of shrimps in the highest HeB concentration were lethargic as compared to controls and exhibited an uncharacteristically white hepatopancreas at the end of the 96-hour exposure. Pinfish exposed to average measured HCB concentrations of 0.06, 0.15, 0.65, 1.87, or 5.2 ug/1 for 42 days accumulated the compound throughout the exposure. Maximum residue in muscle (wet-weight) was 34,000X the measured concentration in test water. Pinfish retained most (>50%) of the HCB after a 28-day depuration period in HCB-free water.
