Millstone Nuclear Power Station 



Niantic 

 Bay 



Figure 3. Location of the entrainment sampling sites. 



The current ichthyoplankton sampling program includes weekly or biweekly collections at station 

 NB (located in mid-Niantic Bay) and at least weekly collections at station EN. Samples at NB were taken 

 with the bongo system described previously using 0.333-mm mesh nets. Sampling duration was 5 min at 

 each depth (surface, mid, and bottom) in stepwise oblique tows. Sample volumes were estimated using 

 one General Oceanics flowmeter in each net. Approximately 300 m of seawater were filtered in each NB 

 sample. Samples at EN were collected with the 1.0 x 3.6-m, 0.333-mm mesh conical plankton net deployed 

 for 4 to 10 min on a gantry system. The deployment time depended on plant operating conditions and 

 it was adjusted to filter about 400 m of cooling water per sample. Four General Oceanics flowmeters 

 were positioned in the mouth of the net to record flow. Volume sampled was calculated by averaging the 

 volume estimates provided by the four flowmeters. All offshore and entrainment samples were preserved 

 in a 5 to 10% formalin solution. 



Although there have been minor changes in laboratory techniques to improve efficiency, the basic 

 process has remained consistent. A dissecting microscope was set at 1 or 1 2 X magnification to view a 

 portion of the sample and fish eggs and larvae were counted or removed using forceps. Initially, all fish 



