A "killack" in 1648?

[Joel S. Berson]

What might be a "killack", in 1648?  Not in OED.

"none shall cast an anker, Graplin, or Killack within, or neer the
Cove, where it may indanger any other vessels"

http://tomorrowstrust.ca/?p=6 (written 2006) has "First she reminded
trustees, as a good Newfoundlander, of the Dory and the Killack. A
fisher rows a dory facing the shore with the sea or destination at
his back. This Davis said should remind trustees that they should
never lose sight of from where they have come. They must know their
history and build on its strengths she said. At the same time she
related how the Killack, a home made anchor of wood and stone, must
due to its fragility always be dropped into known ground. For
Catholic trustees this she reminded them was the foundations of our
faith and the vision they must protect."

http://www.archive.org/stream/accountofpastpre00woodrich/accountofpastpre00woodrich_djvu.txt
says its a fish.

Joel

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