MAY: EFFECTS ON BAIRDIELLA ICISTIA 



B 



Figure 9. — Two-day-old larva, 24°C-20%o, with enlarged subdermal space. A) side view, B) 



dorsal view. 



7), calculated from the preceding information, 

 may be considered the ultimate criterion of suc- 

 cessful development in these experiments. Viable 

 larvae are defined here as morphologically normal 

 larvae capable of surviving to yolk absorption, 

 since all other larvae would not survive in nature. 

 Series A showed a much lower viable hatch than 

 Series B at very high and very low temperatures 

 and salinities. Even for the best eggs, it is clear 

 that salinities above 40%o are detrimental to 



early survival, and that 30°C is extremely stress- 

 ful. Survival at higher salinities was considerably 

 better at low temperatures. The various observa- 

 tions on embryonic and larval survival in Series B 

 are summarized (Figure 13) in the manner of Al- 

 derdice and Forrester (1967). 



Response Surfaces 



It has become customary to describe a biological 



13 



