REGENERATION IN HYDRA ATTENUATA 



589 



Table 10. 



Comparison of Régénération Performance of Week-Old and Day-Old Animais eut at 50% 

 ' Total Length under Différent Feeding Conditions. 



TDT= Time of Tentacle Differentiation. FTN= Final Tentacle Number. ITN= Initial 

 mtacle Number. FTN — ITN = Final Tentacle Number minus Initial Tentacle Number. TRF= 

 mtacle Régénération Factor. BDT= Basai Plate Differentiation Time. N= Number of 

 îgenerated Animais. 



roup I. Week-old animais given 6 units of food/animal (a) daily, (b) at time of detachment, (c) 

 24 hours before opération 





TDT 



N 



FTN 



N 



ITN 



N 



FTN— ITN 

 N 



TRF 



N 



BDT 



N 



(a) 



40.00 ± 5.92 

 9 



5.67 ± 1.50 

 8 



2.44 ± 1.34 

 9 



3.55 ± 1.94 

 8 



329 ± 92 



8 



40.00 ± 0.00 

 10 



(b) 



41.10 ± 3.30 

 7 



4.67 ± 1.03 

 6 



3.00 ± 1.16 

 7 



2.00 ± 1.52 

 6 



125 ± 91 



6 



40.00 ± 0.00 

 10 



(c) 



37.12 ± 3.90 

 7 



5.71 ± 1.14 



7 



3.00 ± 1.16 

 7 



2.71 ± 1.70 

 7 



281 ± 78 



7 



44.40 ± 3.80 

 9 



eioup II. Week-old animais given 1 unit of food/animal given (b) at time of detachment, (c) 24 hours 

 before Opération. 





TDT 



FTN 



ITN 



FTN— ITN 



TRF 



BDT 





N 



N 



N 



N 



N 



N 





40.00 ± 3.33 



6.10 ± 0.90 



2.86 ± 1.30 



3.14 ± 1.21 



223 ± 69 



43.40 ± 4.28 



(b) 



7 



7 



7 



7 



7 



7 





45.00 ± 7.50 



5.00 ± 0.76 



2.25 ± 0.93 

 8 



2.63 ± 1.56 

 8 



229 ± 93 



8 



42.60 ± 4.90 

 8 



(c) 



8 



8 



roup III. Week-old unfed animais. 





TDT 



FTN 



ITN 



FTN— ITN 



TRF 



BDT 





N 



N 



N 



N 



N 



N 





42.90 ± 3.70 



5.45 ± 0.69 



3.27 ± 1.05 



2.18 ± 1.20 



185 ± 119 



41.60 ± 3.40 





12 



12 



11 



11 



11 



12 



