Egg enumeration

Many different methods can be used to count eyed trout eggs, including measuring drained volume, water displacement, weighing, counting the number of eggs in a V-trough (Von Bayer method) etc. The only two methods recognised by AquaSearch ova is however drained volume (highly accurate) and weight (only as an approximation). The remaining methods are considered too inaccurate.

 

The number of eggs in one litre of drained eggs is counted, using a counting plate. After which the drained volume of the entire batch of eggs are defined using a one litre measuring cup. The two figures are multiplied equalling the total number of eggs.

 

A minimum of 2000 eggs are counted, using a counting plate. After which these are drained and weighed on an accurate scale (+/- 0,1 gram), to calculate the weight of 1000 eggs. The entire batch of eggs is then drained throughly and weighed. This figure is then divided with the weight of 1000 eggs and multiplied with 1000 equalling the total number of eggs.