460 



440 



420 



400 



380 



360 



_j 340 

 \ 



^ 320 



I 



9 300 



(T 

 O 



-I 280 



X 



o 



260 



240 

 220 

 200 

 180 



160 

 140 



-y/- 



ACCL I8°C 

 TEST 18° 



36%, 



12 



10 



' //- 



16 



TIME— hours 



-L. 



. 150 



140 



130 



120 



110 



liJ 



9 



100 tr 



o 



_i 



X 



o 



90 



80 



70 



60 



50 



24 48 72 96 



168 



Figure 64. Comparison of the blood chloride ion levels of Penaeus 

 aztecus during adaptation to various salinities at 18°C. The control 



conditions were 15°/ooS and 18°C 



132 



