884 



Fishery Bulletin 101(4) 



was not so pronounced for P. formosa, although of the 12 

 crabs that were damaged prior to re-immersion (10 were 

 "lively" and 2 were "limp"), only 58% were "lively" upon 

 recovery. The mortality rate of 17% for damaged specimens 

 was more than double the 8% overall mortality found dur- 

 ing re-immersion experiments for this species. Most of the 

 dead crabs examined after re-immersion had been attacked 

 by isopods and amphipods and only the shell remained. It 

 is possible that these organisms were in fact responsible 



for killing the crabs, particularly where damage to the shell 

 allowed access to the softer tissues of the crab. 



Calculations of survival rate are given in Table 9 both 

 with and without the re-haul correction. As discussed 

 above, the more accurate estimate of lively ^^ is probably 

 from Table 6 because of the additional handling stress 

 associated with the experiment. However, Table 9 also 

 presents results obtained from data in Table 8 to estimate 

 this probability. The results suggest that the survival rate 



