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Old 09-29-2013, 03:57 PM   #1
RedBlue
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Opae Ula Freshwater Life Span


I know opae ula shrimps live in brackish water, but I want to throw them in a full freshwater tank.

In doing so, how long would they survive in freshwater?
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Old 09-29-2013, 07:46 PM   #2
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It is better to keep them in conditions as close as possible to their natural habitat, I have mine at 1.012sg, when the salinity increases due to evaporation I just add some distilled water, I rarely do water change.
I heard that they can live more than 20 years in the wild.
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Old 09-29-2013, 08:52 PM   #3
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Opae are pretty much extremophiles, so Im sure they can handle freshwater for extended periods of time. I've never read anything about how it affects their lifespan however. Regardless, they won't breed for you in fresh.
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Old 09-30-2013, 08:19 AM   #4
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A LFS used to sell opae ula for mini reef aquaria. Full salt.

Mine are kept in water that measures no less than 1.012, frequently a bit more due to evaporation.

I would think if you try the freshwater idea you switch gradually over days instead of hours.

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Old 11-06-2013, 06:42 AM   #5
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I had had my HRS for several years in varying salinities. Happy, molting, eating so much short green algae they ignored their "treats" after a while and then I decided to try them in freshwater since it is repeated over and over on the Internet this is possible.

I spent two months getting them down to 1.0025 spec. gravity from I believe 1.008 or 1.010 and then went all fresh, keeping a container with the brackish water handy for two days in case of stress. They seemed fine. Day 3 they were fine in the morning, I had a busier day and did not look in again until night time and got to watch the last one die.

On some other forum, someone from HI mentions buying some from a LFS that were in brackish, bringing them home, tossing them in fresh, and having them die in hours.

There is so much info. repeated on this species on the Internet that seems to originate from only a few sources that is almost like an echo chamber. I really wonder if they even live to be 20 years old. Until someone slaps a microchip on a juvie and tracks it for 20 years, I am betting on closer to 5-8 years. The 20 years seems to be a twisting of words from a few people saying they have a large colony that has been going strong for twenty years. Note: The colony is still going, not every original shrimp.

So much "knowledge" is anecdotal compared to the freshwater shrimp info. you can get. So-and-so forgot a jar in his garage for years and they are still alive. Are they or did they breed a few times and a few of them are descendants, etc? I know mine were several years old as I got them as juvies and had a small colony where I could keep track of who was who. How do you do that with 90 shrimp?
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Old 11-08-2013, 05:54 AM   #6
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I know they live at least 16 years probably longer. Got one of those sealed death trap jars from a customer back in 1996, it was only maybe a pint of water at the most and they NEVER bred. I broke open the top right away so i could feed and top off water with distilled. they remained on my parents dining room shelf for the next 16 years. my dad would top off water and feed once a week if he remembered to. The last one died according to my dad last year, and only because he basically forgot about it and it dried up, not old age. I keep a colony of these myself at work and if you treat them with at least a little care, you got a very long lived shrimp species.
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Old 11-08-2013, 06:00 AM   #7
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http://www.fukubonsai.com/M-L2e.html

Look at this page local braddah here in the 808 state. One of the top breeders for the Opae ula. All his methods are successful and his page is resourceful. Happy shrimp keeping
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