AIMS - Manual for the Determination of Egg Fertilisation in Penaeus Monodon - Section III - Distinguishing Fertilised and Unfertilised Eggs

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Manual for the Determination
of Egg Fertility in Penaeus monodon

SECTION III

DISTINGUISHING FERTILISED
AND UNFERTILISED EGGS

DIFFICULTIES 1

Mixture of Fertilised and Unfertilised Eggs:

Figure 3.4 shows egg development approximately 8 hours after spawning. It is difficult to distinguish fertilised from unfertilised ones. The egg in the lower middle is probably the only fertilised egg of the ones shown. Even though the fertilised eggs have undergone cell division some of them begin to break down. Overall a sample collected several hours after spawning will contain a mixture of fertilised and unfertilised eggs which cannot be scored for fertility rates with accuracy.

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