accurately determined by triangulation using a Motorola MiniRanger 

 III so that we could relocate the anchors even after the floats 

 were removed (Sparks and Blodgett, 1983) . 



The 1.3-cm diameter transect rope was marked at 1-m intervals 

 for 100 ra with pieces of smaller nylon cord. Ends of the small 

 cord were knotted to allow the diver to determine each specific 

 interval by touch. The diver placed a 1.0 x 0.5-m (0.5-m ) 

 sampling frame along an interval of the rope and collected all 

 mussels within the frame. He then placed mussels from a single 

 frame in a collection bag which was pulled up to the surface by 

 personnel on the boat. 



On the boat, the contents of the collection bag were 

 transferred to a container and the bag returned to the diver. As 

 the diver moved the frame and returned to sampling, the surface 

 crew identified mussels to species, inspected them for damage, and 

 measured shell height and length. Height was defined as the 

 maximum dorso-ventral dimension of the shell at a right angle to 

 the hinge including the ligament and any wing present and length 

 as the maximum anterio-posterior dimension of the shell. 

 Measurements were made to the nearest 0.001 inch (0.002 5 cm) using 

 a Helios dial caliper. Mussels were returned to the diver and 

 either placed in the substrate in their normal position or simply 

 dumped onto the substrate near their original location. 



10 



