MAN AND THE SEA, II 67 



of the noises they make. Porpoises communicate by sounds under water 

 and could probably be attracted by imitating them. 



Movements. Smooth, regular movements will attract very little attention 

 under water, but jerky, splashy movements are known to scare most fishes 

 away and to attract such large predators as barracudas and sharks. The 

 clever use of body movements can serve to attract some fishes. The authors 

 used retreating movements to attract barracudas for photographic purposes. 

 The same have been known to elicit the curiosity of groupers. Small fishes 

 such as blennies and demoiselles are often attracted by wiggling fingers. 

 Movement is another area about which little is known. 



