4 days and 4 nights each week, alternating weekly at the discharge of 

 Units 1 and 2. Approximately 400 m^ of water were filtered through a 

 l.O-m diameter, 3.6-m long, 0.333-mm mesh conical plankton net. 

 Additional details may be found in the Fish Ecology section. 



Ichthyoplankton samples were taken in Niantic River and Bay with a 

 60-cm bongo sampler with 3.3-m long nets of 0.333-mm mesh towed at 2 

 knots and weighted with a 28.2-kg oceanographic depressor. Volume 

 filtered was determined with General Oceanics flowmeters (Model 2030) 

 and approximated 300 m^ per sample. Single tows (one replicate 

 processed) were taken both day and night using a stepwise oblique tow 

 pattern with equal sampling duration of 5 min in surface, midwater, and 

 bottom strata. The length of tow line necessary to sample the mid-water 

 and bottom strata was based on water depth and the tow line angle as 

 measured with an inclinometer and was determined by the following 

 relationship: 



tow line length = desired sampling depth/cosine of tow angle. 



Tow duration was reduced to 2 min per strata at station A starting on 

 May 28 due to net clogging by lion's mane jellyfish ( Cyanea sp.). At 

 NB, single bongo tows (both replicates processed) were made biweekly 

 from January through March. From April through the end of the larval 

 winter flounder season in mid-June, single bongo tows (one replicate 

 processed) were taken twice weekly (Monday and Thursday or Tuesday and 

 Friday) during day and night. In the Niantic River, preliminary tows 

 were made during the day in February at stations A, B, and C at about 

 weekly intervals to determine when larval winter flounder were present. 

 From March through the disappearance of larvae at each station, single 

 bongo tows (one replicate processed) were made twice weekly (Monday and 

 Thursday or Tuesday and Friday) day and night. 



Sampling time in the Niantic River during daylight and night was 

 systematically varied between two daily periods (prior to 1200 and after 

 1200) and two nightly periods (prior to 2400 and after 2400) since the 

 effect of time of day on collection densities was not known. No 

 sampling was conducted 30 min before or after sunrise or sunset. The 

 two daylight and two night sampling periods were alternated weekly. 



