Chum for Squid?

[MaineSquid]

Hello All,

 

New to the forum and squid fishing.  I was jigging for macks last weekend and hooked up to 4 squid on my sabiki rig and brought them home for dinner.  Now I'm hooked on squid fishing ! 

 

Question:  Do squid respond to chum?  I'm going shark fishing this weekend and was wondering if its worth while casting the squid jig while I'm waiting for a shark to bite.

 

Also everything I'm reading is showing that squid like light and "shallowish" water.  I caught these guys in over 200' of water but close to the surface.  Should I concentrate on shoals and closer to shore?

 

Thanks in advance.