inter cod ground, also.

A long, narrow strip of hard bottom, separated from the Blue Clay by a
narrow mud gully of somewhat greater depth, is called the Prong. Depths
here run from 30 fathoms on the inner parts to 70 fathoms offshore. This
piece furnishes a very suitable bottom for operating gill nets and is
much visited by this type of craft. The Prong lies S. by E. from Cape
Porpoise 17 miles. Marks: Bring Acre Hill in line, Notch of Agamenticus
at the distance from Cape Porpoise just given. From the Isle of Shoals
the Prong is distant 10 miles SE. by E.

Duck Island Ridges. These are two narrow rocky ridges running from
Duck Island (one of the Isles of Shoals) toward Boon Island. reaching
within I mile of the latter. Depths are from 25 to 30 fathoms. These are
good cusk and haddock grounds in the winter and spring, the cusk
remaining on the ground also from April to October. This is a cod ground
in winter and spring, the fish being taken on the "bobber trawl." which
is a trawl of the ordinary type buoyed to "set" 1 fathom or so from the
bottom. It is a hand-line ground in summer for cod and pollock. Both
small boats and vessels, line trawlers, and gillnetters operate here. It
is also a lobster ground.

Boon Island Rock Ground. This ground begins 1/2 mile eastward of Boon
Island Ledge and runs in an ESE. direction 2 or 3 miles from the ledge.
It has a bottom of sharp rocks and clay and depths from 40 to 60
fathoms. It is an excellent fishing ground for cod, haddock, and cusk
and is one of the best winter fishing grounds for haddock in this
vicinity. It is fished mainly by line trawlers but is not much used as
yet by gill-netters, being a somewhat difficult piece of bottom for
them.

Tower Ground. This is a winter haddock ground having depths averaging
50 fathoms over a ridgy and broken bottom. This is about 3 miles long by
2 miles wide and bears about SE. from Boon Island. Marks: Bring Boon
Island Light on the Peak of Mount Agamenticus, running off until the top
of the tower and the top of the mountain are level, perhaps 6 miles from
Boon Island.

Ten Acre or Nipper Ground. Extends S. 1/2 E. from Boon Island 6 miles
and E. from Isles of Shoals 7 miles. This shoal is about 1/4 mile wide
and has 18 to 20 fathoms over clay and mud, the ground sloping gradually
to 50 or 60 fathoms near the edge. This is a good fishing ground for
cod, haddock, cusk, and pollock in the spring, while on the muddy edges
hake are abund