Friday Photospread – Pseudomugil gertrudae – Don’t Give Up!

25 Jan, 2013

Let it be a lesson to you; just when you give up on a species, you might get lucky.  

Pseudomugil gertrudae - image by Matt Pedersen, 2013

I picked up these Gertrude’s or Spotted Blue-Eye Rainbowfish a several months back from The Wet Spot, ultimately winding up with 6 males and 3 females.  While they’d been dancing like crazy, I hadn’t found eggs.  I assumed that even if they were spawning, the Tiger Endlers that shared their 5.5 gallon aquairum were certainly consuming whatever spawn they discovered.  They were fun, but not a breeding project…it was time to move on.

Pseudomugil gertrudae - image by Matt Pedersen, 2013

Male Gertrudae Rainbowfish, displaying to a female (top) and male (lower right), with their cohorts, Tiger Endlers (female bottom right, male center background).

So, earlier this week, I took a few random photographs of the males displaying and had resigned these fish to be sold off…either at a forthcoming auction, or to one of the local fish stores who purchases the fish I rear.  Indeed, the shop wanted them, and I had them literally all bagged up when I noticed a single egg in the spawning mop!

Pseudomugil gertrudae - image by Matt Pedersen, 2013

As I’ve never worked with Rainbowfish, a quick shout out to fellow fish geeks Steve Waldron and Ted Judy gave me two experienced viewpoints on the rearing of this and similar species.

Steve commented – “They tend to predate their own embryos, so if you want to raise a large group, you should check the mops every day. They hatch after 2 weeks at 75F, I start mine out on APR (which is Artificial Plankton Rotifer, A.P.R.) in small 1-2 liter or so shallow containers, change 1/2 the water every day, feed 2X a day. With this treatment they will start feeding on [baby brine shrimp] in a week or two and then I would move them on to 5 or ten gallon tanks”.

Meanwhile, Ted suggested that “[Gertrudae] fry are actually quite large, and have no problems taking [baby brine shrimp] right from the get go. I also feed all rainbow fry Repashy Soilent Green and Spawn & Grow dry broadcast onto the surface as a powdered food…works great, and has a lot more nutrition to it than powdered apr.”

Pseudomugil gertrudae - image by Matt Pedersen, 2013

Of course, the marine breeder in me has an endless supply of real rotifers, as well as the APBreed TDO Size A, which is also a rotifer-surrogate.  Looks like I have my work cut out for me!

Pseudomugil gertrudae - image by Matt Pedersen, 2013

My apologies to the LFS, I won’t be dropping these guys off today!

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About the author

Matt Pedersen
Matt Pedersen

Matt Pedersen is a Sr. Editor and Associate Publisher with Reef To Rainforest Media, LLC, including AMAZONAS & CORAL Magazines. Matt has kept aquariums for 34 years, has worked in most facets of the aquarium trade, is an active aquarist and fish breeder (both marine and freshwater), and was recognized as the 2009 MASNA Aquarist of the Year.

1 Comment

  1. February 17, 2013

    Matt–Those gerties are something else!
    They’ve been on my “wish list” since childhood!
    These are simply beautiful.
    Rapture!

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