Figure 3. — Weight plotted as a 

 (unction of length in the two 

 gray whale calves. Data from 

 Gigi I is represented by squares, 

 and from Gigi II by circles. At 

 the time of the rapid weight 

 increase Gigi II was approxi- 

 mately 9.5 months old. Gil more 

 (1961) reported data from one 

 calf which died after being 

 stranded in San Francisco Bay. 

 Data from Rice and Wolman 

 (1971) represent north and 

 southbound calves (lower and 

 upper points respectively): the 

 difference supports the hypothe- 

 sis that gray whales fast during 

 the southern migration. 



Figure 4. — Tidal volume (V|) in a gray whale 

 calf during the first year of life. Tlie regression 

 equation for tlie line is: V( = (47 ^ body 

 weigtit in metric Ions) - 70. Tlie correlation 

 coefficient r = 0.99. 



MINUTE VENTILATION 



I 4- LITERS 



markedly from one breath to the next, 

 sometimes by 50 percent. 



Resting lung volume. (Figure 6) 

 necessarily varied from breath to 

 breath also, and in addition, the mea- 

 surement was technically difficult be- 

 cause of the difference between in- 

 spired and expired \\. Nevertheless, 

 five measurements were felt to be 

 adequate. Two measurements were 

 made at weight = 6.150 kg. one 

 when awash and one when stranded 

 on the bottom of the completely 

 drained tank. Lung volume was re- 

 duced by about 20 percent by strand- 

 ing, although that value was deter- 

 mined only once. 



From time collections of mixed ex- 

 pired gas. oxygen consumption was 

 computed (Figure 7). The composi- 

 tion of end tidal gas from Gigi I! 

 was determined on several occasions, 

 and did not vary systematically with 

 age. End tidal ^02 varied from 54 



Figure 5. — Minute ventilation 

 (Vf) in two gray wtiale calves, 

 expressed as a function of body 

 weigfil. Ttie triangle represents 

 data from observations in Gigi I. 

 Ttie regression equation for Itie 

 data from Gigi II (circles) is: 

 V£ = (70 X body weight in 

 metric tons) - 117. Although 

 the r = 0.94 for this rectilinear 

 regression, it is apparent that a 

 sigmoid curve could be even 

 more closely filled to the data. 



Figure 6. — Resting lung volume in a gray whale 

 calf (Gigi II), expressed as a function of body 

 weight. Resting lung volume includes tidal 

 volume, and is the volume of gas in the lungs 

 during the intervals between breaths. The 

 equation for the line is: lung volume = (70 X 

 body weight in metric tons) - 44; for which 

 r = 0.94. 



Table 1. — Arterial blood gas tensions and pH, 

 drawn at random during the respiratory cycle. 



Age, months 

 2 5 3 10 



55 62 60 



56 69 41 



7 23 7,32 7 35 



Pa02, mm Hg 

 PaC02, mm Hg 

 pH 



OXYGEN CONSUMPTION 



WEIGHT kg X 10^ 



WEIGHT kg X lO' 



H 1 1 H 



3 4 5 6 



Figure 7, — Oxygen consumption in liters/min 

 (Vq.,) in two gray whale calves, expressed as 

 a function of body weight. The triangle rep- 

 resents data from observations in Gigi I. The 

 regression equation tor the data from Gigi II 

 (circles) is: VOj = (41 « body weight in 

 metric tons) - 5.7; lor which r = 0.96. 



