Abstrict An apparatus for spacing crayfish more evenly in a water pond and,
at the same time, providing protection from predators during times
of low water is disclosed comprising a submersible, hollow dome-shaped
structure having at least one opening in its side wall of sufficient
size to allow the crayfish to enter.
Claims What I claim is:
1. A method of harvesting crayfish in a pond comprising:
(a) positioning in spaced apart fashion in said pond devices, each
comprising a submersible body positionable on the bottom of the
pond and having a center cavity opening to the pond bottom, said
body being further provided with at least one opening sized and
positioned to allow crayfish to enter said cavity;
(b) placing young crayfish about said devices;
(c) placing crayfish traps during crayfish harvesting time periods
near at least some of said devices; and
(d) periodically removing said crayfish traps to remove the crayfish
found therein.
2. A method according to claim 1 wherein said devices are moved
prior to placing said crayfish traps in the pond.
3. A method according to claim 1 wherein bait is placed in said
crayfish traps prior to placing said crayfish traps in the pond.
Description BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates broadly to crayfish harvesting and, more
particularly, to apparatus for spacing, sheltering and trapping
crayfish.
2. Prior Art
As the average lifespan of a crayfish is only eighteen months,
great care must be taken to insure their survival for a long enough
period not only to grow to maturity, but to protect them during
the period prior to their dormant season as well as during the time
they have been trapped but not harvested.
The present industry practice is to take the young crayfish and
hand scatter them into a shallow pond. At this stage, the young
crayfish are easy prey for turtles and snakes until they have had
time to burrow into the pond bottom. Since the crayfish prefer to
burrow next to logs, rock and similar natural obstacles in the pond
bottom, there is, unfortunately, a tendency for the crayfish to
cluster in fairly restricted areas. This raises several problems
in feeding the crayfish and in harvesting the crayfish. With the
crayfish clustered, much of the pond area is wasted and lower poundage
per acre results. Secondly, it is harder to harvest mechanically
around the obstacles even if it is known where they are.
Another problem is the loss of crayfish during harvesting which
results from their predators' ability to get to the crayfish in
the presently used traps.
SUMMARY OF THE INVENTION
Therefore, it is an object of this invention to provide a device
that promotes even distribution of crayfish in a pond.
Another object of this invention is to provide a device that better
protects crayfish during their growing season from their natural
predators.
Still another object of this invention is to provide a device that
facilitates the harvesting of the crayfish.
A further object of this invention is to provide a device that
reduces loss of harvesting from attacks on the crayfish in traps
by their natural predators.
Other objects and advantages of this invention shall become apparent
from the ensuing descriptions of the invention.
Accordingly, a submersible device is provided for use in a crayfish
pond comprising a raised body having a center cavity formed by side
walls and top and provided with at least one opening sized and positioned
to allow crayfish to enter the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a three-dimensional view of a preferred embodiment of
a dome-shaped device in accordance with this invention.
FIG. 2 is a cross-sectional view taken along lines I--I of FIG.
1 illustrating use of a preferred embodiment of this invention by
crayfish.
FIG. 3 is a three-dimensional view of a preferred embodiment of
a wire mesh trap utilized in accordance with this invention.
FIG. 4 is a top view of a pond utilizing both the dome-shaped device
and traps of this invention.
PREFERRED EMBODIMENTS OF THE INVENTION
Referring now to FIGS. 1 and 2 a preferred embodiment of the submersible
device, denoted generally by the numeral 1 is shown having a raised
body 2 being pyramid in shape with each side 3 indented along lines
4-6 to form a roof 7 over entrance opening 8 that leads into the
center cavity 9 under body 2.
Opening 8 is sized to allow crayfish 10 to enter and exit cavity
9 but preferably not big enough to allow turtles to enter. Because
device 1 must be submersible, it must be constructed of materials
that will prevent device 1 from floating in the pond water.
In use, device 1 is submerged in the water 11 and placed on the
pond bottom 12. Since at certain times during the crayfish growing
season, the water level in the pond may drop below roof 7 it is
preferred that an opening 13 be positioned in body 2 most preferably
at its apex as shown, in order to prevent air from being trapped
in cavity 9 as the water level rises over body 2. This allows the
use of lighter materials and more varied shapes to the dome.
In another preferred aspect of this invention as seen in FIG. 3
conventional crayfish trap 15 having opening 16 leading into a cavity
formed by a mesh screen 17 is improved by providing a section 18
that has no openings in its outer surface and which extends completely
around trap 15 and, preferably, is at least 18" in length.
It has been found that crayfish which enter trap 15 through opening
16 will congregate in the part of the cavity formed by section 18.
Thus, the crayfish are protected from snakes and turtles eating
the crayfish through the mesh screen.
Now in practice, devices 1 are positioned in the desired pattern
in pond 19 (see FIG. 4) when the pond is being seeded with the small
crayfish 10. These crayfish are scattered about devices 1 where
it has been found they will enter openings 8 and burrow into pond
bottom 12 to form their tunnels 20. Food for the crayfish, such
as rice, etc., can then be positioned close to the sheltering device
1 so the crayfish do not have to venture far to feed. Thus, there
is less likelihood of attack from predators. When the crayfish have
grown, traps 15 are positioned between the submerged devices. Since
it is now better known where the crayfish are located in the pond,
greater yields can be harvested with less loss.
There are, of course, many embodiments of this invention not specifically
described but which are intended to be included within the scope
of this invention as defined by the following claims. |