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Co2 And Aggression?
February 5, 2010
4:35 pm
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john stephen
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Hello all. Having only just registered with the forum I'm unsure if this subject has previously been raised. If so could you please direct me to the appropriate link. Could somebody please tell me if there is any link between raised co2 levels and aggression in a normally docile aquarium. I'm asking because after many months of trial and error I finally have a flourishing, planted, freshwater aquarium, thanks partly to a diy co2 infusion which I set up about 8 weeks ago. Unfortunately about 4 weeks ago I started to notice a male swordtail being unusually aggressive towards the 3 platy's and more recently towards 6 zebra danio's resulting in them all spending much of their time in hiding. I have considered territorial/mating behaviour but why now after 8 months of apparent harmony? Any information will be greatly appreciated. Many thanks.

February 6, 2010
9:02 pm
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Matt
Málaga, Spain
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Hi John and welcome. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> Can I ask how big the male swordtail was when you bought it and are there any females in the tank?

Cake or death?
February 7, 2010
12:50 pm
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john stephen
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QUOTE (Matt @ Feb 6 2010, 08:45 PM) < {POST_SNAPBACK}>
Hi John and welcome. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> Can I ask how big the male swordtail was when you bought it and are there any females in the tank?


Hi Matt and thanks for the reply. The male swordtail was 1.5" to caudal peduncle when purchased and hasn't grown any, am assuming he was adult at the time. There are 2 females in the tank. Hope this extra info helps. /unsure.gif" style="vertical-align:middle" emoid=":unsure:" border="0" alt="unsure.gif" />

February 7, 2010
3:45 pm
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Matt
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Hi John 1.5" is pretty small for a male sword but I wouldn't be surprised that it hasn't grown the way some of these domesticated forms have become. Maybe it's just coming into sexual maturity hence the heightened aggression? To answer your original question I've never heard of CO2 added to aid plant growth affecting the behaviour of a fish before.

Cake or death?
February 8, 2010
2:59 pm
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john stephen
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QUOTE (Matt @ Feb 7 2010, 03:28 PM) < {POST_SNAPBACK}>
Hi John 1.5" is pretty small for a male sword but I wouldn't be surprised that it hasn't grown the way some of these domesticated forms have become. Maybe it's just coming into sexual maturity hence the heightened aggression? To answer your original question I've never heard of CO2 added to aid plant growth affecting the behaviour of a fish before.


Many thanks for the info Matt. Just one more query. As his behaviour is causing many of the other inhabitants to hide away for the majority of the time, would isolating him for a short period be of any help or should I just allow nature to take its own course?.

February 8, 2010
8:39 pm
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Eyrie
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I don't think the problem fish will learn to associate being isolated with bad behaviour. I'd actually lean the other way and suggest that it would be worse on returning to the tank as it then seeks to re-establish itself.

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February 9, 2010
3:51 pm
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Bluedave
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Having used CO2 in a few tanks I have never had a problem with aggression - other than that which you'd expect from certain fish.

February 10, 2010
4:09 pm
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john stephen
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Many thanks to all for the info' and comments. I'll allow the culprit to strut his stuff for the time being. I'm hoping it doesn't last too long as it's a shame his "tankmates" don't have the freedom to swim where they like at the moment. Ah well, Que Sera Sera.

February 11, 2010
5:07 pm
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coelacanth
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It has been shown in Convict Cichlids, not sure about other spp.

February 11, 2010
11:20 pm
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Matt
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Got a link Pete?

Cake or death?
February 12, 2010
7:42 pm
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Eyrie
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Was there any explanation of the cause (eg reduced oxygen levels?)

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February 13, 2010
3:01 pm
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coelacanth
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Got the actual paper somewhere, dunno where though...

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