9 
ing the marked fish and returning it. The results attained, 
however, sufficiently justify the method employed and in- 
dicate that it should be followed up on a larger scale. They 
show that there is in some cases migration to some distance, 
in others the fish remain apparently at or near the same spot 
for some considerable time. 
Thus of the 21 recaptured fish 8 were found near the 
same spot. Of these six were recaptured within 1 to g days 
after being released. Two, however, were recaptured in 
39 and 31 days respectively near the same spot. 
Of the cases where a considerable movement is shown this 
has usually taken place at no great rate apparently as a con- 
siderable period has elapsed between release and capture. 
The method employed, however, does no more than indicate 
the minimum rate at which the fish may have travelled. 
One case indicates that there may be a very considerable 
migratory movement apart from the slow wandering about 
in search of food. This was when a fish (No. 50) set free off 
Milnerton on the zgth August was found on the 9th September 
at Oude Kraal having gone a distance of about 134 miles in 
Ir days (vide diagram). 
The next case (No. 768) in which the fish was captured 
within a comparatively short time (14 days) shows a move- 
ment from off Sea Point to Clifton. The time and direction 
of movement in both of these cases is probably indicated by 
the return. In other cases, however, in which a considerable 
time has elapsed between the release and recapture of the fish 
(from 52 to 217 days) the direction indicated may not have 
been a true movement. Thus for instance in No. 106 the 
fish may have moved from Milnerton in a southerly direction 
like No. 50 and then outwards over to the neighbourhood of 
the Whale Rock. 
{C.P. 83-1918] 
