Yeah, it's a crack, it's been there pretty much from the start and isn't moving. Being on the belly I'm not too worried, but I'm keeping an eye on it. The pinch on the mirror image knot on the other limb is more concern, but that seems stable too.
The great thing about the stave is the back which is pretty much clean aloang the whole length excepty for a pin knot which swells up nicely and I've left proud.
Del