NUTRITION AND GROWTH OF LARVAE 



155 



16 

 Q 14 



cn 



g 12 

 CL 



a: 



O 10 



< 

 t- a 



CD 



3 



— liver food 

 spinoch a 

 liver food 



_L 



80 100 120 



TIME — DAYS 



140 



Effect of diet on time of metamorphosis. The number of 

 completely metamorphosed tadpoles Is plotted against time 

 in days after fertilization. 



From Brlgge & Davidson I9I+2: Jour. Exp. Zool. 90:i^01. 



The kidney atones produced from oxalic acid of spinach and found coimnonly among the 

 frog tadpoles at metamorphosia (Brigga & Davidson, I9I+2) are not seriously damaging, and 

 spinach seems to carry the forms to metamorphosis more rapidly than any other diet. 

 Daphnla and then Enchytrea have proven to he the best for Urodele larvae, with small 

 strips of liver being offered after metamorphosis. 



iiqrlnwn 



10 60 90 100 



Growth curves for tigrinum and punctatum larvae raised 

 under similar environmental conditions out on differ- 

 ent diets. Vertical lines indicate the beginning of 

 feeding. 



From Hutchinson & Hewitt 1955: Jour. Exp. Zool. ll:kG'^. 



