compelete casting off and cutting-off cheliped

One crayfish cut-off his cheliped because he feel his cheliped useless at this times.
His cheliped will be regenerated someday.

The other crayfish cast-off his entire body repeatedly and he ate his shell hiding it in his burrow.

Ooop~Carnivorous crayfish

"I don't have interest with you no longer because I have enjoyed eating your friend yesterday already"
- A carnivorous crayfish disregard his prey.

Instead of guppy, his old victim, he attacked his companion.
Today morning he was a vicious carnivore.
One of weak crayfish was prey for his breakfast.

sudden attack in the morning

When there is no enough food in aqua, crayfish attack "guppy".  A vicious cray attack a guppy using his powerful cheliped and sharp craw.
But fortunately my student rescued "guppy" from predator's sudden attack.

                                                           Size : 13.7 x 9.3 x 3.6cm

Neighbor or enemy ?

                                        Will guppy be a new neighbor or prey for crayfish ? 

                                One crayfish is just looking for new neighbor eating his food.

                                But the other vicious crayfish glare at guppy gloatingly to attack.

casting off for growth

One crayfish casting off its shell for growth.

When they are casting off, they are very sensative like as our juvenile age.

They don't like to change their environment.

Crayfish attacked and killed Blacktetra

Blacktetra in one of fast and sensative tropical fish but was prey for a crayfish.

fighting with rival crayfish

Two rival crayfish are fighting for shelter but no one made sacrifice.
They fight to only occupy rock crevice.