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It was formerly considered quite an 
accomplishment to breed the Pearl Danio, 
Danio albolineatus, and many were the 
arguments as to the exact angle at which 
the sun’s rays must strike the aquarium 
to satisfy the requirements of the fish. 
Be this as it may, the fish does require 
sunshine and plenty of it. My most 
successful spawning took place in a large, 
heated aquarium, 39 by 16 by 16 inches, 
that stood in a _ southwest window, 
through which the sun literally blazed all 
day. Such a large aquarium is not 
necessary. Otto Klemmer succeeded in 
securing spawn in a cylindrical all-glass 
tank about 14 inches in dameter. This 
was placed in a south window. The bot- 
tom was covered with marbles, with a 
spray of Myriophyllum added for “ap- 
pearance sake.” The eggs, being heavy 
and non-adhesive, dropped among the 
marbles and beyond reach of the adults. 
A temperature of about 80 degrees 
should be maintained just prior to a 
spawning, and kept up for the eggs and 
Mature fish do well 
at an average of 75 degrees, and even 70, 
for this is a “hardy exotic,” but low tem- 
peratures retard spawning. 
fry some time after. 
The fry require plenty of microscopic 
animal life for about a week, and can 
then be coaxed to take dry prepared 
food, which must be as fine as possible. 
When they have grown a trifle they 
should be given the tiniest Daphne passed 
through a screen that none may be too 
large for them to swallow. From this 
time on, with abundant live food, they 
can almost be seen to grow. 
It is safe to say that no fish is so pop- 
| WALTER LANNOY BRIND, F. Z. S. | 
os os a a ss Os Os ss is Ps 6 9 Pt es 
ular as Danio albolineatus, not even its 
relative, D. rerio. It is beautiful, hardy 
and a good “happy family” fish. The 
general color, as the light strikes it, is 
a beautiful metallic turquoise blue; at 
another angle the blue turns to peacock 
green. When in breeding condition the 
male is flushed with salmon pink. From 
a point on the lateral line, just ahead of 
the dorsal, a pink stripe, bordered below 
Danio albolineatus 
with bluish violet, runs back and through 
the tail fin. In specimens preserved in 
alcohol the pink line becomes white. And 
as the species was probably originally de- 
scribed from preserved material, the 
origin of the specific name albolineatus, 
meaning white lined, is evident. 
The males are usually more slender 
than the females and pinker. The anal 
fin of the male is longer and broader, 
with a deep rosy red horizontal stripe 
paralleled by dark green and canary yel- 
low, though all these colors are more or 
less evanescent. Both are alike in size, 
reaching a length of two inches. 
Some years ago I received from Fu- 
rope a fish that the Germans then called 
“der neue Danio aus Singapore’ (the 
