HOUDE: NORTHERN SENNET 



Table 1. — Summary of morphometric data from laboratory-reared (L) larvae and from wild-caught (W) larvae 

 and juveniles of Sphyraena horealis. (Specimens between broken lines are undergoing notochord flexion.) Except 

 for total and standard lengths, measurements are proportional values, the ratio of the character relative to standard 

 length. 



Specimen 

 No. 



Total 

 length 



Standard 

 length 



Preonal 

 length 



Isf predorsal 2nd predorsal 

 length length 



Head 

 length 



Snout 

 length 



Tip lower 

 jaw 



Eye 

 diameter 



13 (L) 

 M (L) 



17 (L) 



15 (L) 



18 (L) 



16 (L) 



19 (L) 



24 (W) 

 23 (W) 



20 (L) 



28 (W) 

 26 (W) 



30 (W) 



29 (W) 



21 (W) 



25 (W) 



22 (W) 

 32 (W) 



31 (W) 



10.2 

 12.2 

 12.9 

 13.4 

 13.7 

 13.7 

 14.7 

 15.9 

 16.5 

 16.7 

 19.4 

 19.1 

 19.7 

 21.2 

 24.2 

 24.6 

 33.9 

 66.8 

 70.0 



9.4 

 10.9 

 11.3 

 11.9 

 12.1 

 12.3 

 12.7 

 13.7 

 14.4 

 14.5 

 16.9 

 17.0 

 17.1 

 18.4 

 21.0 

 21.5 

 30.6 

 59.6 

 62.9 



.70 

 .70 

 .71 

 .69 

 .69 

 .66 

 .68 

 .72 

 .72 

 .63 

 .70 

 .69 

 .70 

 .7C 

 .71 

 .70 

 .70 

 .71 

 .72 



0.50 



.44 

 .44 

 .47 

 .49 

 .48 

 .47 

 .47 

 .48 

 .46 

 .47 

 .49 

 .46 

 .46 

 .46 

 .45 



.68 

 .68 

 .70 

 .68 

 .68 

 .66 

 .70 

 .71 

 .70 

 .71 

 .70 

 .70 

 .70 

 .70 

 .72 

 .69 

 .70 

 .70 

 .71 



.32 

 .33 

 .36 

 .31 

 .33 

 .32 

 .34 

 .32 

 .36 

 .35 

 .33 

 .32 

 .32 

 .33 

 .34 

 .32 

 .32 

 .32 

 .32 



.13 

 .14 

 .12 

 .13 

 .12 

 .13 

 .13 

 .12 

 .15 

 .14 

 .14 

 .14 

 .13 

 .14 

 .15 

 .14 

 .14 

 .14 

 .14 



<.01 

 .02 



.02 

 .01 

 .03 

 .02 

 .05 

 .04 

 .03 

 .04 

 .04 

 .04 

 .05 

 .06 

 .03 

 .06 

 .03 

 .03 



.09 

 .08 

 .08 

 .08 

 .08 

 .08 

 .08 

 .07 

 .08 

 .08 

 .07 

 .06 

 .06 

 .07 

 .08 

 .07 

 .07 

 .06 

 .06 



16.0- 

 14.0 



s 



S 12.0- 



X 



O 10.0 



z 



UJ 



"* ».0 



^ '-OH 



z 

 < 



I- 4 0- 







"1 I I I I I I 



6 a 10 1? 14 16 It 



DAYS AFTER HATCHING 



20 



— 1 — 

 22 



Figure 4. — Growth of Sphyraena borealis larvae reared 

 in the laboratory at an average temperature of 24.0° C. 



were formed near the posteroventral surface of 

 the urostylar vertebra. There were 3 epurals 

 and 2 pairs of uroneurals ossifying dorsal to the 

 urostyle. The 17 principal caudal rays were sup- 

 ported by the hypural bones. Principal caudal 

 ray support was as follows: hypural 1 support- 

 ed rays 1 to 3; hypural 2 supported rays 4 to 7; 

 hypural 3 supported ray 8; hypural 4 supported 

 rays 9 to 11 ; hypural 5 supported rays 12 to 15; 

 hypural 6 supported rays 16 and 17. A 17.0- 

 mm SL specimen differed from smaller speci- 

 mens only in having the first principal caudal ray 

 partially supported by the haemal spine of the 

 penultimate vertebra as well as the first hypural 

 bone. All elements were at least partially ossi- 

 fied at 17.0 mm SL; both the epurals and uro- 

 neurals were the most poorly ossified bones of 

 the caudal skeleton at this stage. Hollister 

 (1937) examined caudal skeletons of adult and 



191 



