Opae’ula Breeding at Record Pace in the 10-Gallon

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Opae’ula Post-Larval Stage

The opae’ula pre-adult development cycle lasts approximately 11.5 weeks. The brooding period is 38 days. The larval stage involves two substages: zoea (17 days) and megalopa (11 days). The final stage before adulthood is juvenile (14 days). Adults are theoretically able to live more than 20 years.

In the larval stage, the opae are limited to moving vertically only or hanging suspended in the water. They remain upside down, with their head pointed down and tail pointed up. In the post-larval juvenile stage, they begin to move horizontally and diagonally. In this video, we see them (tiny dots) just beginning to swim sideways on their own.

Keep an eye out for a berried female. There are three or more in this tank. Females can produce more than once per year.

Acknowledgment: Soundtrack “Alta Loma Terrace” by Wes Hutchinson.

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Opae’ula Juveniles – Growing Population

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Third Batch of Zoeae – Baby Opae’ula

Last updated 2/19/18

Update 2/19/18: Correction: The zoeae are probably from the same batch reported on Jan. 29.

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Opae’ula Zoeae – Another Batch 3 Feb 2018

Last updated 2/19/18

Update 2/19/18: Correction: The zoeae are probably from the same batch reported on Jan. 29.

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A Dozen Opae’ula Zoeae in 10-Gallon (West)

Last updated 2/19/18

A dozen opae’ula zoeae in 10-gallon west-facing tank. A few berried females, too.

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Opae’ula Noon


This is the 18-gallon filled to the 10-gallon level. Reversion to UGF with air filters (turned on intermittently) and switch to tap water (left standing overnight to disperse chlorine gas) has had very positive results. The tank is thriving with active breeding. It’s close to the south-facing windows where it gets a lot of sun throughout most of the day. Decided to switch the 10-gallon that gets late afternoon sun from the west-facing window back to UGF and air filters.

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