Sudden death of cynops orientalis larvae

[farinaboy]

Hi,i'm a "new breeder",i've 6 cynops orientalis from '09,and thi year i've decided to breed them... now,more larvae have rised and they are in a box with 10 cm of water,ambient temperature is on 20 C°,they eat daphnie and other micro-organism of a lake near my town.
Monday i found a big larvae in the parental's paludarium,then i've catch him,and put in a small box with little water level and a small plant from the paludarium,because it was very big,i've seen eat more daphnie monday evening,but this morning it was deat.
i've not clean water yesterday,is it possible that he dies for the water pollution in 3 days? the box is 20 cmx20cm and 3cm the water level,water was from the lake (i think now i'we the answer...).... but... if this is the answer,the death cause is for the sudden change of water? they are so delicate? no larvae are death in the other box and the water is the same...
excuse me for my english,and i'm sure you will help me to know this broblem.
some images of the larvae
http://**************/photo/my-images/593/girone03.jpg/
http://**************/photo/my-images/443/girone01ls.jpg/

 

[rebel]

Hey, i recently had the same prolbem. Had two little larvae, seemd to be doign well and hten next day, found them both dead. I dont know what happened. Ive heard people say that they die for unknown reasons, but its not just you.

 

[farinaboy]

his behavior was like a "mature cynops" i thought he was fine,and for this reason i catched him and reduced the water level but maybe i do this more quikly and with the lake's water.maybe the changeling is the problem. The other larvae lives with 50% of lake(for the daphnie) and 50% of parental's paludarium water(because it's good) and only one is died from their rise(right??) .. is it possible it's the cause of death?

 

[Molch]

I find that I have larvae deaths when I try to keep the larvae in small separate boxes. I have far better success - virtually no larvae die - if I just keep them in a well established tank with plant growth and a healthy layer of mulm on the bottom.

 

[farinaboy]

"healthy layer of mulm on the bottom" is very interesting,i am ossessionated with the clean of the bottom from their excrement,do you clean a lot the mulm?

 

[Molch]

I don't clean the mulm very often; as long as there is a viable bacteria population processing the mulm and as long as water quality is fine, it's ok and even beneficial to have some mulm. Some people call this the "good dirt" in a tank. Small micro-organism and other tiny things live down there and provide food for newly hatched larvae.

I do remove uneaten food, because that can overwhelm the bacteria population and foul up the water.

Too much cleaning can be a mistake; you would prevent a healthy bacteria population from establishing.

 

[farinaboy]

Ok,in any case,today no larvae dead,i think the cause of death is the shock of the changeling of water from the paludarium to the water of the lake.
other images of the larvae.
http://**************/photo/my-images/820/uovay.jpg/
http://**************/photo/my-images/840/cynops.jpg/