YOUNG JACK CREVALLES 



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STANDARD LENGTH IN MM 



40 



Figure 31. — Caranx crysos: Relation of length of the preopercular-angle spine to standard length. 



This may have been referred to as an additional 

 body bar by Nichols (1939: 6), Beebe and Tee-Van 

 (1928: 110), Fowler (1936: 699), and possibly 

 others. 



The pigmentation on the brain case changes 

 from a few large melanophores on the transparent 

 portion to a pigment mass which is projected 

 posterodorsally and which forms the nuchal band 

 by about 29 mm. (figs. 17 to 21). The brain 

 case becomes opaque between 10 mm. and 15 mm. 

 (figs. 20 and 21). Concentrations of pigment below 

 the eye and on the eye above and below the pupil 

 give the impression that the nuchal band bends 

 downward and continues through the eye. A 

 vertically elongated spot forms on the operculum 

 from about 30 to 40 mm., becomes prominent at 

 about 60 mm., and is reduced in size and located 

 on the upper and outer margin of the operculum 

 by about 100 mm. 



Pigment on the first dorsal fin intensifies to 

 about 82 mm. standard length and diminishes at larg- 

 er sizes; that of the anal interspinous membranes is 

 similar but never as concentrated as on the first 

 dorsal (figs. 17 to 23). Pigmentation on the 

 second dorsal and anal fins is pronounced at 

 8.5 mm. (fig. 19) and intensifies to above 82 mm. 

 (figs. 20 to 23). Pigment spots are present on 

 the pelvics by 7.0 mm. (fig. 18) and on the caudal 

 and pectorals by 29 mm. (fig. 22), but these fins 

 are never heavily pigmented. 



Five specimens with enlarged gonads, which 

 were approaching spawning condition, were darker 

 than other specimens examined. Described from 

 preservation in isopropyl alcohol: the 4 females 

 (247 to 267 mm.) were dark above and light below 

 the lateral line, with clear pelvics and slightly 

 dusky anal fins; the 225-mm. male was black above 

 and leaden below the lateral line, and all the fins 

 were dark with the pelvics very black. 



