FISHERY BULLETIN: VOL. 73, NO. 1 



i.e., the artery and vein subdivide to form parallel 

 capillaries which enter the gas gland (Figures 3, 4, 

 6). Retial orientation varies from a position 

 parallel to the long axis of the swim bladder to one 

 that is perpendicular (Figure 1). Size characteris- 

 tics of swim-bladder components are given in 

 Table 2. Distinctive features of the swim bladder 

 of the six stromateoid families are described 

 below. 



Centrolophidae 



Swdm-bladder volume in the fishes examined 

 varied from less than 1% of body volume in 

 Schedophilus to greater than 3% in Hyperoglyphe. 

 Size (greatest dimension) of the gas gland cells 

 ranged from 10-17 ^m in Hyperoglyphe and 

 Seriolella to 20-40 /uni in Schedophilus. Retial 

 length ranged from 1.1 mm in Seriolella to 2.0 mm 



Figure 6. — Transverse section through the rete mirabile of the swim bladder oi Tetragonurus cuvieri. 



(From same specimen as Figure IC.) 



Table 2. — Size characteristics of the swim-bladder lumen, gas gland, and rete mirabile in 12 species of stromateoids. 



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