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View Full Version : Something is attacking our fish :(



Mike
Sun, 6th Jun 2010, 10:17 AM
We had another viscious attack sometime Friday night or Saturday morning. This time to Kristy's female mandarin that we have had for close to three years. Almost all of her fins are gone- top fin, tail, and side fins. We moved her to the small tank, but as you can imagine she is not doing too well.

So far this has happened to another smaller male mandarin (over two years ago) and to a lantern basslet. The lantern was jumped twice, once (~9 months ago) left him with part of his tail and most of one fin missing, then a second (myabe 3 months ago) more of his tail and other fin were gone. He not too long after the second attack dissapeared for good with no trace. All the vi tims are small, slow fish that sleep on the sandbed.

These attacks have happened over a fairly long period of time. The problem is with the new female mandarin's attack, we no longer have some of the popular suspects from the previous attacks. We used to have a coral banded shrimp who is gone and we had a big pistol shrimp, who I am 95% sure is now gone (no pops and gone from visible tunnels underneath).

So left in our tank as suspects are 2 good sized red serpent/brittle starfish we were told were fish safe. We did not have them in the tank when the male mandarin was attacked.

We do have a few small, with one getting to be medium hermit crabs. I don't see how they could hold a fish down to trim off all the fins.

We do not think we have any fish who might be suspect- 4 tangs, bunch of anthias, a butterfly, couple of reef safe wrasses, couple of dwarf angels. Among the more aggressive biters in the tank are the maroon clown pair, flame tail blenny, 3+ year old damsel and 3+ year old bi-color blenny.

Sorry for the long rambling post- any thoughts on possible cuprit?

Europhyllia
Sun, 6th Jun 2010, 10:21 AM
perhaps rather than a critter trying to eat the fish it could be someone defending their territory? Any sandbed dwelling gobies or blennies maybe?
I really like some products by Seachem. One is Stressguard and one is Paraguard. In the little mandarin's case teh stressguard may help her with her fins
Good luck!

Mr Cob
Sun, 6th Jun 2010, 10:24 AM
Put a red light on your head and do some late night adventuring. I'd wait a couple hours after lights are out and make sure that all the lights in the room are off and sit around to see what you find. This happened to me when I first got into the hobby and I found a large hairy crab. Watching the tank with a red light was creepy...reminded me of snorkeling my favorite surf spots. You are better off not knowing what's there...lol!

RayAllen
Sun, 6th Jun 2010, 10:26 AM
Sounds to me like the culprit is attacking at night when the lights go out. I strongly doubt its a fish because when the lights go out every fish ive ever known slows down and "sleeps" no matter how aggressive they may be. Id suspect a invert of some sort which are more active during the night. From the damage you describe something jumps on the fish while not moving to cause that kind of damage.

Good luck on your investigation, time to brake out the flashlights!

RayAllen
Sun, 6th Jun 2010, 10:27 AM
Rob you and I are on the same page. Doesn't sound like a fish at all.

Mr Cob
Sun, 6th Jun 2010, 10:29 AM
lol

Kristy
Sun, 6th Jun 2010, 11:22 AM
Well, she did not make it. I am beyond sad... she has been with us a long time, ate frozen, and had really fattened up to a healthy size. So frustrating!

For comparison, I went back and found the thread when we lost our tiny male mandarin to this same thing...
http://www.maast.org/showthread.php?43633-Struggling-mandarin&highlight=mandarin

Europhyllia
Sun, 6th Jun 2010, 11:25 AM
sorry Kristy :(

Since the attacks happen only every 3 months or so I'd be loosing motivation for night watching after a few days but maybe you're more patient.

Mr Cob
Sun, 6th Jun 2010, 12:52 PM
maybe it takes 2-3 months for the culprit to catch something. Doesn't mean it's not out every night though.

Bill S
Sun, 6th Jun 2010, 12:57 PM
Some of those big serpent stars have been known to grab thing occasionally... That's what I'd suspect.

Europhyllia
Sun, 6th Jun 2010, 01:37 PM
Some of those big serpent stars have been known to grab thing occasionally... That's what I'd suspect.
yeah every once in awhile I'm tempted by those and then I chicken out because most of my fish are small, slow and peaceful

kkiel02
Sun, 6th Jun 2010, 02:18 PM
But would the serpent eat away the fins? I was thinking a crab of some sort?

Edit- But you would see the marks if a crab grabbed it. Unless the crab just grabbed the fin.

Europhyllia
Sun, 6th Jun 2010, 03:26 PM
But would the serpent eat away the fins? I was thinking a crab of some sort?

Edit- But you would see the marks if a crab grabbed it. Unless the crab just grabbed the fin.
Agree. That's why my first thought another fish.

Regric25
Sun, 6th Jun 2010, 06:41 PM
Hey Kristy and Mike! I didnt want to say anything before this but ill tell ya now.

Do you have any emerald crabs in your tank?

When I brought home Hanz annd Franz they both attacked my Diamond Goby early in the morning before my lights were on. I watched it with my own eyes. This happened after about 2 weeks of having them. They grabbed the Goby's tail while he was sleeping and they started to eat his fins. It totally caught my by suprize! When the Goby woke up he tried to swim away and he couldnt Hanz and a good grip on him and I had to intervene. Sad to say the Goby didnt make it :( but its okay. I keep Hanz and Franz well fed now! I did some research and I found that when emerald crabs get bigger they are known to have a taste for meaty foods.

Europhyllia
Sun, 6th Jun 2010, 07:04 PM
note to self: when setting up new tank move Veronica and Virgina to the sump

sorry regric. That must have been awful!