Hydra eating grindal worms ID video
Posted 03 August 2013 - 04:36 PM
I captured this video as a test to see if they really were eating my fry (the idea being that if they would eat the grindal worms that they would also be a threat to the fry) before treating the tank with fenbendazole, which finally killed them.
Here is the video of the response of hydras to grindal worms. This should serve as a good identification video for people in the future and definitive proof that yes, they are carnivorous.
Posted 04 August 2013 - 10:19 AM
Ps, pretty amazing how those skinny little arms can grab and hold that "big" worm !
Posted 04 August 2013 - 10:00 PM
Posted 05 August 2013 - 06:50 AM
I used two one gram packets in my 75 gallon tank, one day after the other. Fenbendazole is the active ingredient in Panacur. The levamisole hydrochloride also killed them in the first of the two 75 gallon tanks, but it killed my seahorses and copepods, too. I've heard that Panacur doesn't kill seahorses. If I saw hydras in my tanks again in the future I'd use fenbendazole again instead of levamisole hydrochloride. The female mandarin dragonette died within a month of the levamisole hcl and I can't rule that out as the cause of death.
I have used Panacur to successfully eliminate them. This was in a tank with a healthy breeding population of both snails and cherry shrimp, neither of which suffered any ill effects. I didn't measure it precisely, but a "pinch" in a ten gallon did the trick (after it dissolved, which took about a day)
Posted 05 August 2013 - 10:16 AM
Posted 05 August 2013 - 11:57 AM
I didn't either. I'm glad they didn't spread to any of my other tanks.
I didnt know there were Hydra species that could survive in both seawater and fresh water.
This is the first of my aquatic denizens that my husband has found cute in the past several years. Of course he likes the hydras, one of the few things I absolutely can't keep because they eat fry. >.< Maybe if we put them in a separate room, and if he'd told me he liked them just a few hours before I added the fenbendazole instead of a few hours after... *shrugs* They are kinda cute, the way their little arms grab for the worm. I found out they eat, digest, and vomit out of the same hole instead of pooing, though, which does make them slightly less cute. :/
Posted 16 August 2013 - 10:16 PM
Posted 27 August 2013 - 07:45 PM
I found out they eat, digest, and vomit out of the same hole instead of pooing, though
Kinda makes you wonder how they...
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