The factors affecting the shape and volume of ripe eggs of the bitterling,
Acheilognathus macropterus, an exotic introduction to Lake Kasumigaura, Japan, were investigated throughout the spawning periods in 2009 and 2010. The shape and long axis to short axis ratio (L/S) were stable, regardless of female parent size, whereas the volume depended upon the latter. Shape and L/S may reflect phylogenic traits, whereas egg volume may vary according to parental condition so as to maximize the number and survivability of offspring at the individual level.
抄録全体を表示