18 feet of 1 X 2 inch No. 2 grade pine ($.03/lineal foot) . , , $ 0.54 



36 feet of 1 x 4 inch No. 2 grade pine ($.09/lineal foot) . . . 3.24 



48 feet of 1 X 8 inch No. 2 grade pine ($.19/lineal foot) ... 9.12 



58 feet of 18-inch wide, 1-inch mesh chicken wire 



($9. 00/150-foot roll) 3.48 



Miscellaneous (rope, bricks, staples, and buoys) 5.00 



Total cost of materials $21.38 



Total labor (16 hours at $1.50/hour) 24.00 



Grand total $45.38 



1200 

 I 100 

 1000 

 900 

 800 

 700 

 600 

 500 

 400 

 300 

 200 

 100 



10 



FIGURE 4. 



20 

 MAY 



10 20 

 JUNE 



29 



-CUMULATIVE CURVE OF CHANNELED WHELKS 

 TRAPPED IN 1957. 



Bait 



Mussels, quahaugs, cind horseshoe 

 crabs ( Limulus polyphemus ) were all tried 

 as bait. Only horseshoe .crabs with their 

 shells broken to expose the meat proved 

 effective in attracting the channeled whelk; 

 the other baits tested failed to attract 

 snails. Each trap was baited with one or 

 two horseshoe crabs. When traps were hauled 

 old bait was removed and fresh crabs added. 



The trapping of whelks correspond 

 with the period when horseshoe crabs were 

 migrating from the open ocean to the shallow 

 water of Oyster Pond River. Since the crabs 

 visited the river for only a short duration, 

 less than 2 months, it was necessary to col- 

 lect a good supply just before trapping was 

 initiated. A wire pen was installed near the 

 trapping area to hold the crabs. To prevent 

 them from escaping, the bottom of the pen 



was buried a foot below the surface and the 

 top bent inward to form an inverted V. 



Trapping Procedure 



Trapping was conducte 

 2-acre leases in Oyster Po 

 May 20 to June 27, 1957, and 

 June 30, 1958. Initially, 

 traps with 70 feet between t 

 on the lease. It was 100 fe 

 in line with the river flow, 

 were built, we used 12, whic 

 the direction of river flow 

 rows, one row 70 feet offsho 

 130 feet. 



d on one of the 

 nd River from 

 from May 12 to 

 one row of six 

 raps was placed 

 et offshore and 

 As more traps 

 h were set in 

 in two parallel 

 re and the other 



The traps were fished and reset on 

 Monday, Wednesday, and Friday of each week. 

 Daily catches were less in fouled traps than 

 in clean ones; therefore, traps heavily 

 fouled with algae were taken out of water 

 for a day to be dried and cleaned. 



I 100 

 1000 ■ 

 900 ■ 

 800 

 700 ■ 

 600 ■ 

 500 

 400 

 300 

 200 

 100 

 OL 



20 

 MAY 



10 20 29 

 JUNE 



FIGURE 5. --CUMULATI VE CURVE OF CHANNELED WHELKS 

 TRAPPED IN 1958. 



