FISH CULTURE IN BRITISH EAST AFRICA 81 
sent to Mr. Jackson (then Lieut. -Governor) as evidence that 
trout had established themselves in the Aberdare forest streams. 
Shortly after returning from leave, I resumed the project 
of introducing the German domestic carp to the waters of Lake 
Naivasha (of this more anon), but in the discussion which arose 
it was pointed out that carp in Lake Naivasha might have a 
prejudicial effect on the propagation of trout there. Carp 
are not cannibals like trout, but they love to browse, like sheep, 
along the bottoms of still rivers and ponds and feed on the 
ova of other fish. Mr. Clarke (of the Longonot Syndicate) and 
others who are conversant with the present position of trout 
in the New Zealand lakes were unanimous that if carp were 
placed in Lake Naivasha trout would not do so well as if placed 
there by themselves. 
Mr. Clarke wrote : * My experience in New Zealand is that 
where carp are turned out, trout do not thrive or increase 
at all. For instance, in Lake Rotomahana carp were very 
plentiful. There are numerous good streams running into this 
lake which were afterwards stocked with trout, both ova and 
spawn, but they never did any good ; whereas, in all the lakes 
and streams surrounding Rotomahana where no carp were 
liberated, trout abound. I think the Morendat a perfect 
trout stream and feel sure that in the waters of Naivasha lake 
trout will thrive splendidly.’ 
Mr. Clarke lives on the borders of Lake Naivasha and sails 
its waters about once a week, so that he is in a position to 
judge of its trout-bearing capabilities. 
It has been decided, therefore, for the present, to exclude 
from the Naivasha lake both the carp from Cape Colony and the 
bass which have been kindly promised by Mr. Roosevelt. In 
place of putting carp and bass into the Naivasha lake, it was 
decided to try to get trout there ; and the first step to take, 
with this end in view, was to get trout transferred from the 
Gura river on the Aberdare moorland to the upper waters of 
the Morendat, whence it is hoped they may spread naturally 
into Lake Naivasha. 
On June 8 last instructions were sent to the Forest Officer 
at Nyeri to proceed with the systematic transfer of the trout, 
if they were sufficiently abundant in the Gura river, to other 
