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D R. Wenzloff 



R. A. GREIG 



NorlheasI Fiaheries Center Milford Laboratory 

 National Marine Fisheries Seniice. NOAA 

 Milford. CT 06460 



A. S. MERRILL 



J. W. Ropes 



Northeast Fisheries Center Woods Hole Laboratory 

 National Marine Fisheries Service. NOAA 

 Woods Hole. MA 02543 



APPARENT FEEDING BY THE FIN WHALE, 



BALARNOPTERA PHYSALUS. AND HLIMPBACK 



WHALE, MEGAPTERA NOVAENGLIAE, ON 



THE AMERICAN SAND LANCE, AMMODYTES 



AMERICASLS. IN THE NORTHWEST ATLANTIC 



On 18 May 1977 a large group of fin, Balacnoptera 

 p/!V.sa/(/.s. and humpback, Megaptera novaengliae, 

 whales was observed on Stellwagen Bank north of 

 Cape Cod (lat. 42"26'N, long. 70°26'W) by North- 

 east Fisheries Center (NEFC) personnel conduct- 

 ing an annual spring bottom-trawl survey aboard 

 the National Oceanic and Atmospheric Adminis- 

 tration RV Albatros.v IV. Nine fin and 14 

 humpback whales were identified and observed 

 near the vessel. More whales were sighted in the 

 vicinity, but were too far away to identify posi- 

 tively or to observe conveniently. Many great 

 black-back. Larus marinus, and herring, Lariis 

 argcntatus, gulls were seen feeding at the surface 

 and circling around the whales. The whales dis- 

 played a characteristic feeding behavior described 

 by Gunther ( 1949) and mentioned in Katona et al. 

 (1975). The animals we observed were circling, 

 spouting often, making short shallow dives, and 

 not moving in any set direction. They behaved in a 

 leisurely manner and were seemingly undis- 

 turbed by our presence as noted by Gunther 

 ( 1949). Echo sounding traces indicated a depth of 

 40 m in this area and large patches of densely 

 concentrated small fishes throughout the water 

 column, but particularly near the surface. During 

 several 30-min bottom-trawl tows in the area, up 

 to 400 kg of adult American sand lance, Ainiuo- 



FISHERY BULLETIN VOL 77. NO 1. 1979 



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