The 2003 regs are not posted yet. Here's the info from last year.
http://www.state.ma.us/dfwele/dmf/re.../rec_index.htm
Recreational Finfish and Shellfish Restrictions for 2002
Species Min. Size Open Season Possession Limit
American Eel 6" all year 50 fish
The Comm regs had the following note:
(1) Subject to regulation by the Division and local community. Consult local regulations.
I'm planning on doing the same thing up on the Merrimack.