The researchers found, in fact, that some mixed populations did show declining egg size.

In two rivers where few hatchery fry had been introduced, egg size remained relatively constant.

Absorption of water from the soil leads to increased egg size.

This brought them evolutionary advantage by allowing a decline in egg size.

As with their ultimate body size, egg size tends to increase further away from the Equator.

Females will lay between 11 and 26 smooth white eggs (egg size roughly 30 X 60 mm) in the summer.

As with other fish species, there is some variation in egg size from female-to-female.

It works best for small ones, even down to egg size, but those are hardly worthwhile to work, unless they are really fine quality.

Incubation is 20-24 days and egg size is 39 x 27 mm.

The egg size will increase with the body size of the tortoise.