Manual for the Determination
of Egg Fertility in Penaeus monodon

SECTION III

DISTINGUISHING FERTILISED AND UNFERTILISED EGGS

DIFFICULTIES 4

 

Developmental Abnormalities 2:

Figure 3.7a shows abnormal development of a fertilised egg approximately 10 hours after spawning. The egg in the lower middle has suffered some form of developmental deformity. A sample of eggs from this spawning would have resulted in this egg being classified as fertile since it clearly developed past the 4-cell stage. This fertility information is valuable since it will rule out poor fertility, e.g. due to poor male quality, as the reason for poor hatches. It is indicative of poor egg quality, which may be due to a host of factors.

 

3.7b	3.7c

Figure 3.7b and c shows deformed embryos approximately 11 hours after spawning. Note that the embryo does not have the normal single naupliar eye but rather has two. Although this egg may have been successfully fertilised it clearly suffered developmental abnormalities.

 

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