I have an Arrowhead Crab (Arrow Crab) in a saltwater fish tank.
His bottom sometimes "opens up" like a very small clamshell on a hinge. The little flap that opens is perhaps 1/8 inch in diameter.
The crab puts his pincer claws in there as if picking out food (or doing something)
Any idea what part of the crab's anatomy I am looking at or what is going on? I am guessing maybe this is an egg sac or maybe preparation for molting, but this has been going on for several days?
2007-01-06 05:45:44 · 3 answers · asked by bill d 1 in Pets ➔ Fish
That is where their sexual organs are located. It is also where they excrete from. When you see it open up he is probably just taking a leak.
He may be preparing to molt too, in that case he will be looking for a place to hide, and won't move at all for several days until he actually starts the molting process.
2007-01-06 05:51:48 · answer #1 · answered by fish guy 5 · 0⤊ 1⤋
Arrowhead Crab
2016-11-08 10:02:15 · answer #2 · answered by ? 4 · 0⤊ 0⤋
They open up there to clean. Other crabs also do this.
2013-10-03 13:09:21 · answer #3 · answered by Dana 3 · 0⤊ 0⤋