Manual for the Determination
of Egg Fertility in Penaeus monodon

SECTION II

2.15a	2.15b

Figure 2.15a, b Time 13 hours

Not all eggs will have hatched by this time. Hatching does not occur synchronously and its timing is temperature dependent. However, if the eggs do not hatch out within a few hours of each other then the nauplii will be of questionable quality. In addition, if hatching has not occurred by 15 hours post-spawning the nauplii may be of inferior quality. This figure (2.15b) shows the 1^st naupliar stage with appendages fully extended.

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