432 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



relative growth rates at larger sizes. He stated 

 that these two species can be separated by their 

 constant differential length-weight growth ratio, 

 as well as by differences in weight at the same 

 length. 



Recorded maximum sizes of the species have 

 not received much attention. The following max- 

 imum total lengths and weights represent a partial 

 abstract of the literature: 



crysos — about 28 in. (750 mm., Fowler 1953 : 57) ; 

 about 4 lb. (Bigelow and Schroeder, 1953: 

 376). 



ruber— 12.1 in. (308 mm., UF 3538). 



bartholomaei — about 39 in. (1,000 mm., Fowler 

 1953: 57). 



latus— to 22 in. (Beebe and Tee-Van, 1928: 108). 



hippos — 40 in. (1,020 mm., SAFI collection); 



maximum recorded weight 36 lb. (Bigelow 

 and Schroeder, 1953: 376). Several eye- 

 witness accounts of large jack crevalles of 

 more than 5 feet in length from the Gulf of 

 Mexico may have been this species. Stewart 

 Springer reported (personal communication) 

 having preserved and mounted a 41 -lb. 

 hippos caught off the Mississippi coast. 

 dentex — 24 in. (Jordan and Evermann, 1896: 



927). 

 lugubris — about 39 in. (about 1,000 mm., 

 Fowler 1953: 58); 15.5 lb. (Woods and 

 Kanazawa, 1951: 631). 

 Head length. — A composite graph of the re- 

 gression lines for head length on standard length 

 of the five common species is shown in figure 10. 

 At approximately 22 mm. standard length, crysos 



40 



30 



X 

 h- 



20 



< 



10 



-i 1 1 r 



-i 1 1 r 



"i 1 1 r 



"i 1 1 r 



1 1 1 r 



crysos 



ruber 



bartholomaei 



lotus 



hippos 



oL 



_i i i_ 



_i i i_ 



j i i- 



25 



50 75 



STANDARD LENGTH IN MM 



100 



125 



Figure 10. — Comparison of the regression lines for the relation of head length to standard length for five species of Carai<x. 



