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Vnivcrsitij of California Publications in Zoology [Vol. 16 



in seventeen days. Their movements were apparently haphazard, and 

 yet there may be some significance in the fact that the three that 

 travelled over three miles did so in an easterly direction. It would be 

 quite hazardous, however, to draw conclusions from such slender data. 

 One curious result of the work is seen in the repeated capture 

 of certain specimens. Of course, all of the specimens were first caught 

 before they could be tagged. Of the twenty-seven specimens caught 

 the greater portion were at my request thrown back again into the 

 water. Of these five were caught once more — the third time in all. 

 It is really quite surprising that one-fifth of those caught twice should 

 be thus caught a third time. The data are too meager to warrant a 

 positive conclusion, but it would appear that there are certain indi- 

 viduals more susceptible to trapping than others. At least they do 



SANTA BARBARA 



Fig. 2. Distances and directions traveled by Spiny Lobsters released at Santa 

 Barbara. 



not learn by experience to avoid being caught. No. 475 travelled a 

 distance of one and two-fifths miles from shallow to deeper water. 

 Since it was released on November 12, the time when the alleged 

 migration to deeper water is taking place, this case would tend to 

 substantiate the occurrence of such a migration process. 



Data regarding the size and sex of tagged lobsters seem to show 

 that these factors have no bearing iipon either the direction or extent 

 of migration. 



A very important by-product of this experiment is the light that 

 it throws upon the intensity of the fishing operations, and the con- 

 sequent depletion of the species. We have records of 334 tagged 

 lobsters. Several fishermen given tags no doubt affixed them without 

 sending a record of it. They would probably also fail to send a 

 record of the capture of tagged spiny lobsters. The isolation and 

 illiteracy of many would be a factor in this connection, as would also 



