MAGNUSON: ADAPTATIONS OF SCOMBROIDS AND XIPHOIDS 



Table 1. — Densities (DA of eight scombroid species by size group and the multipliers to convert 

 mass of fish (My in grams) to the lift {L in dynes) required for hydrostatic equilibrium. Multipliers' 

 computed for seawater with densities of 1) 1.022 g/ml and 2) 1.025 g/ml. Measurements by 

 methods described by Magnuson ( 1970). 



Mass 



Acuiiihiicy- 

 Scoinhcr hiiim Sarda Aiixis 



japanniis solanciri chilienMis rochci 



Eiiihyninis Kuisiiwoniis Thunniis Tliiinniis 

 uffinis pelamis cilhacares (ihesu\ 



0.00-1.99 kg: 

 Number of fish 

 ^/(g/ml): 

 Artean 

 SD 

 Range 



Multiplier 



18 



1.054 

 0.011 

 1.024 

 1.069 



28.0 



28.0 



2.00-3.99 kg: 

 Number of fish 

 Df (g/ml): 

 Mean 

 SD 

 Range 



Multiplier (1) 

 (2) 



4.00-5.99 kg: 

 Number of fish 

 Df (g/ml): 



Mean 



SD 



Range 



Multiplier (1) 



(2) 



6.00-7.99 kg: 

 Number of fish 

 O, (g/ml): 



Mean 



SD 



Range 



Multiplier (1) 

 (2) 



8.00-9.99 kg: 

 Number of fish 



Mean 



SD 



Range 



Multiplier (1) 

 (2) 



^ 10.00 kg: 

 Number of fish 

 0/(9/ml): 



Mean 



SD 



Range 



Multiplier (1) 

 (2) 



All sizes (without gas bladders only): 

 Number of fish 

 Df (g/ml): 



Mean 



SD 



Range 



Multiplier (1) 



(2) 



1.028 

 0.007 

 < 1 .022 

 1.042 

 5.78 

 2.94 



10 



1.080 

 0.006 

 1.067 

 1.086 



52.7 



50.0 



13 



12 



12 



36 



47 



23 



62 



1.096 

 0.004 

 1.088 

 1.099 



66.3 



63.5 



68 



12 



17 



' [(1 ' /^ )980] where D^ is the density of environment. 



341 



