Plecs are eating all my fish! - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 10 Old 10-02-2010, 02:17 AM Thread Starter
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Plecs are eating all my fish!

I have had both my plecs now for a couple of years never really had any problems until about 4 months ago. All of a sudden we come down each morning to NOT find the latest casualty! I've lost copious neons, guppies, both the male and female SFs and the angel. We've been baffled for a while but had started to suspect the Plecs as they were not going near the algae wafers. Last night I got the shock of my life. There was one of my albinos with its face eaten off and the Plec lying right over it appearing to have a good munch. Now I think we caught him out as the tank light had not been on all evening as we had been out unexpectedly late. (When I say him - I don't know, we have two, one larger than the other, who vigorously rearrange the tank but never seen any babies).

My question - If I am feeding them well (AW, brine shrimp, cucumber just before lights out) Why the hell are they eating my fish?!

I have to say I will be gutted to get rid of them as the plecs are my favourites to watch. The tank is generally very peaceful, I have been off sick all week and there has not been anything noticeable going on, not even a little bit of moodyness.

Thanks for any replies.

Jo
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post #2 of 10 Old 10-02-2010, 12:58 PM
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I would suggest it is more likely that something else is killing the various fish, and the plec is simply eating the remains. Many fish will readily eat a dead carcass if they find it. And many species of plec are not strict vegetarians so will not pass up an opportunity as they would have in nature, eating whatever they find along the way.

But having said that, there are pleco species that will kill other fish if they are very small fish and the pleco is large enough. You'd have to provide us with the species and size in order to pursue this. But I am still inclined to the above theory.

As for why the fish are dying, if you post tank size, water parameters (pH, hardness, nitrates, nitrite and ammonia numbers), number and type of fish, someone may have ideas.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 10 Old 10-11-2010, 06:12 AM
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yes i agree with byron, i dont even think a pleco would really be able to take down a fish but i have had them prey on a already dead fish, also seen them float upside down to get pellets lol
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post #4 of 10 Old 10-11-2010, 11:44 AM
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Quote:
Originally Posted by whalejuice View Post
yes i agree with byron, i dont even think a pleco would really be able to take down a fish but i have had them prey on a already dead fish, also seen them float upside down to get pellets lol
I have had a few people tell me about witnessing their large plecos try to attack other fish, but they're always the ones that ask "what are allergy wafers?"...

plecos love detritus. any dead fish is fair game, he's just doing what comes natural.



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post #5 of 10 Old 10-11-2010, 04:54 PM
but they will try to eat mucus off of sick fishes.be on the look out for those signs as there is something seriously wrong with that fish and you'll need to qt the affected fish or re-home the plec while it heals

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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post #6 of 10 Old 10-13-2010, 04:51 PM
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detritus

What is detritus sorry dont want to sound stupid but keep hearing it mentioned.
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post #7 of 10 Old 10-13-2010, 05:54 PM
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Quote:
Originally Posted by katkins1957 View Post
What is detritus sorry dont want to sound stupid but keep hearing it mentioned.
dead stuff



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post #8 of 10 Old 10-14-2010, 12:02 AM
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I dont think that the pleco could eat another fish, though I have heard stories of it. Like stated above he is probally just cleaning house and getting rid of the remains. I have seen 2 of my plecos eat a large wag in one night.

46 Gallon BOW front (Semi Aggressive)
2 dianos
3 Angel fish
2 Bala Sharks
2 Irredescent Sharks
2 Silver skirted tetra
2 red rose barbs
1 pleco

29 Gallon BOW front (tropical community)
12 Neon Tetras
3 Black Tetras
2 Red wag
2 Sunbursts
1 Black mollie
2 Guppys
1 Pleco
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post #9 of 10 Old 11-19-2010, 11:10 PM
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I've also heard of plecs eating other fish and becoming quite agressive. Plecs are nocturnal so sleeping fish at night are easy prey for them, especially if the fish are small. The plecs will also "suck" other fishes slime coat off because it is a source of protein. This means that even if your fish are too big for Lloyd to swallow, he may be sucking their sides at night and leaving them vulnerable to other infections.
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post #10 of 10 Old 11-20-2010, 01:44 AM
could be but most of the time if the fishes were healthy they would swim away quickly.most of the time if they don't a few days later the fish will get sick =(

5x2x2 aro,highfin bat,fei feng,ST,albino tinfoil,c.perch
4x1.5x1.5 planted tetras,harlequins,
otto,WMM,2 types of celebes rainbows,rcs,amano, bamboo,red ramhorns,MTS
3.5x2.5x2 flowerhorn,pleco
3x1.5x1.5 russel's lion,blue cleaner,sixline and leopard wrasse,maroon clown pair,green chromis,scorpion,tiger cowrie,turbo,lyretail anthias,jewel,anemone,star polyp,marbled and giant green mushi,zoa
2x1x1 nano sw shrimps
22 May 2012
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