HIGH RANCHU MON

HIGH RANCHU MON
Art by Alexander Vasiljev, Copyright © 2017

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Friday, May 2, 2014

FIRST CULL - IT'S ALL ABOUT THE TAIL

Since the eggs hatched, I was culling any fry with deformed body as soon as I can identify it. But today, two weeks from hatching, I went through a major cull, ending up keeping only 40%.

The fry is now half an inch (13 mm) long. Even though the tail is now more or less defined, still, it is hard to detect its details and asymmetry between the tail lobes and shoulders, and the tail split. Today my goal was to select the fry with a straight body line and with the most open tail, which ideally should be 180 degrees, but not narrower than 160 degrees. The culling was done through looking from above. Below, I put together a few diagrams to illustrate what tail shape and development I was looking for. Misshaped tail is outlined in blue and should be the reason for disqualification. The photos are not of my actual fry and are used only for illustration purposes.

The next cull should be carried in about two weeks or when the fry reaches 6/8th of an inch (20 mm), and the tail is further developed with more details visible. I anticipate even greater reduction in numbers then.



Desired tail shape and
degree of openness 
Tail has no split in the middle


Single, regressed tail
Tail is not open. Red line indicates
degree of desired openness


Tail is not open and
is asymmetrical
Tail is open but asymmetrical