O'CONNELL; PERCENTAGE OF STARVING NORTHERN ANCHOVY LARVAE 



6 3gv«,^„^_^^_^ 



Figures 1-6. — Histx)logical comparisons of healthy (left) and emaciated (right) nort;hem anchovy larvae. All sections are approximately 

 sagittal. 1) The trunk musculature, cut tangential to the body surface, forms a solid sheet. The foregut mucosa is composed of imiform 

 cuboidal cells. 6.1 mm SL; 250 x . 2> The trunk musculature, cut tangentially, shows widely separated fibers. 8.5 nmi SL; 250 x . 3)The 

 foregut mucosa is composed of uniform thick cuboidal cells. 7.0 mm SL; 630 x . 4) The foregut is irregular and the cells of the mucosa are 

 diminished in size. 6.1 mm SL; 630 x. 5) The mucosa of the midgut shows good integrity and organization, and the lumen contains 

 moderate food residue. 6.3 mm SL; 250 x. 6) The midgut is filled with disassociated cellular debris and the mucosa is fragmentary. 

 Separated trunk muscle fibers are also visible. 8.5 mm SL; 250 x . Symbols: Fg, foregut; K, kidney; L, liver; M, trunk muscle; Mg, midgut; 

 N, notochord; R, food residue; T, transverse muscle coat of digestive tract; U, mucosa. 



reported for a number of ungulates, primates, and 

 birds (Harthoorn 1977) and in the swordfish, 

 Xiphias gladius (Tibbo et al. 1961). The outstand- 

 ing symptom is degeneration of skeletal muscle, 



presumably from acidemia from overexertion dur- 

 ing intense flight and struggle in capture. Though 

 the possibility cannot be entirely dismissed, cap- 

 ture myopathy seems an unlikely cause of the 



477 



