Porpoise 5 July. break water every 15-20 seconds. The rear dorsal flukes are kept in continuous rhythmic un- dulation, except when breaking water for a breath. During the time that the air is expanded & a new breath taken the flukes are held still or almost so. When they turn the magnitude of the turn is seldom more than 45° This is because of the difficulty in check- ing their forward motion. Sharper turns can be executed at the fast speed, but are more likely to occur at slow speeds 27 Aug Holkham Bay, Alaska 337° T, 1.6 mil from Bar Light The porpoise have been seen every day about the Bay. They are roll- ing & blowing in the slow man- er that indicates they are fish- ing or traveling slowly. This one particular one is the first one that I have seen blow-