Acknowledgments 



The field work was sponsored by a grant to The 

 Johns Hopkins University from the Arctic Insti- 

 tute of North America under contractural agree- 

 ments with the Office of Naval Research. Field 

 recording equipment was supplied by the National 

 Science Foundation, Office of Polar Programs. 

 Help in the field was given by D. 0. Lavallee of 

 New York City and Winfred James of Gambell, 

 Alaska. Teresa Bray and Karen E. Moore assisted 

 in acoustic analyses and manuscript preparation, 

 which has been supported by contract N00014- 

 74-C0262 NR 083-004, with the Oceanic Biology 

 Program of the Office of Naval Research. We 

 thank F. H. Fay, John J. Burns, and William E. 

 Schevill for their critical reading of the manu- 

 script. 



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WILLIAM A. WATKINS 



G. CARLETON RAY 



Woods Hole Oceanographic Institution 

 Woods Hole, MA 02543 



Department of Pathobiology 

 The Johns Hopkins University 

 615 North Wolfe Street 

 Baltimore, MD 21205 



OBSERVATIONS ON FEEDING, GROWTH, 



LOCOMOTOR BEHAVIOR, AND BUOYANCY OF 



A PELAGIC STROMATEOID FISH, 



ICICHTHYS LOCK1NGTONI 



Stromateoid fishes (Order Perciformes) occur in 

 either coastal or oceanic regions of the sea. In- 

 habitants of the latter region are generally rare 

 and sporadic in occurrence, especially as adults. 

 Many of the oceanic species have particular adap- 

 tations for pelagic existence (Horn 1975) and their 

 frequent association with floating objects, espe- 

 cially coelenterates (scyphomedusae and 

 siphonophores), is well documented (e.g., Man- 

 sueti 1963; Haedrich 1967; Bone and Brook 1973; 

 Horn 1975). 



The live capture and successful laboratory 

 maintenance of a juvenile Icichthys lockingtoni 

 Jordan and Gilbert (family Centrolophidae), an 

 oceanic fish of the North Pacific, provided the first 

 opportunity to record the feeding, growth, and 

 locomotor behavior of this pelagic stromateoid 

 and, upon the death of the fish, to measure its 

 buoyancy and lipid content (as a factor in 

 buoyancy). In this paper, the laboratory rearing 

 and maintenance of oceanic stromateoids are 

 briefly reviewed, and the adaptive strategy of/. 



453 



