The seasonal, lunar and diurnal spawning patterns of the Red Sea whitebelly damselfish Amblyglyphidodon leucogaster were investigated in Eilat, Israel over 3 years. Males were permanently territorial and defended a specific nest site, while females moved about the study site.
All reproductive activity was confined to a distinct breeding season from May to September. Spawning activity exhibited no lunar periodicity and occurred each day of the lunar month. Diurnal spawning activity tend to be concentrated around sunrise but spawning occurred throughout the day.
Females spawned asynchronously and were capable of laying a batch of eggs every second day. Spawning generally involved a single male and female, but mating involving multiple females also occurred. Females were promiscuous and mated with as many as 15 different males. Males brooded from one
to eight clutches of eggs in the nest at one time. Brood cycles lasted from 6 to 12 days and males completed a number of brood cycles per season. Eggs were defended by the male for 5–8 days prior to hatching. The pattern of spawning exhibited by A. leucogaster appears to be inconsistent
with larval biology hypotheses. Factors affecting adult biology may control reproduction on each time scale.
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