a. Note the grouping together of 

 three or four shrimp in response to 

 salinity and temperature stress. 

 Normal shrimp were not observed 

 behaving in this manner 



b. After losing coordinated loco- 

 motor movements, this shrimp was 

 seen spiralling in the water and 

 then in this nose-diving posture. 

 It held the posture for about 30 

 seconds, beating its pleopods 

 rapidly, before falling over 



»-^ 



c. Abdominal cramping condition: 

 Normal shrimp (bottom), half 

 cramped (middle), and fully 

 cramped (upper) condition 



Figure 3. Effect of salinity and temperature change on the behavioral 



responses in Penaeus aztecus 



