2 



^ 



Z 



66.0 

 62.0 



58.0 

 54.0 



50.0 

 46.0 

 42.0 

 38.0 

 34.0 

 30.0 

 26.0 

 22.0 

 18.0 

 14.0 

 10. a 



6.0 

 2.0 



VA- 



ACCL 25''C 

 TEST 32»C 



/ 



<'"'"■— ^ 



-''' 



^z" 



.^■ 



.X' 



y 



/ 



I 



I / 



367o, 



^257o» - 



*r 



•H^ 



^ , 1-' ' 



CONTROL 15 7. 





12 



-//- 



_i I l_ 



780 



740 



700 



660 



620 



580 



540 



500 



460 2 



420 « 

 UJ 



z 



380 <2 



340 

 300 

 260 

 220 

 180 

 140 

 100 



60 



20 



10 16 24 48 72 96 



TIME— hours 



168 



Figure 71. Comparison of blood magnesium ion levels of Penaeus aztecus 

 during adaptation to various salinities at 32°C. The control conditions 



were 15°/ooS and 25°C 



141 



