Operation of the Ship "One boiler operation was maintained during the aurvey, to ensure maximum fuel-economy, except while entering and leaving Speeds between stations .. port. .3 second leg fifteen knots, twelve knots, .. eleven knots, ...."* first leg . were as follows: .. .; third leg The ship's speed was gradually reduced when coming on atation during which time the bathythermograph drop was made. When the speed was one to two kmots and the ship was headed with the wind off the port bow the portscrew waa stopped and the plankton net was dropped. A speed of about one knot was maintained during the plankton haul. The vessel came to a dead stop while the water bottle casts were made. Cruising speed was gradually resumed following completion of the collections. COLLECTION AND PREPARATION OF SAMPLES Plankton, water and fish samples and continuous measure- ments of the activity in the surface water were taken. These samples and their preparation were the same as for the Walton survey with the following exceptions. | Water samples were taken from the surface, 25, 50, 100 and 150 meters to make certain that at least the deepest bottle would be below the thermocline. The plankton volumes were determined * Quoted from letter from Commanding Officer, USS Marsh (DE 699) to CTG 7.3, 23 September 1956,