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Choosing
an appropriate and viable aquaculture site is an important step in planning
your business. A number of factors must be taken into consideration
including the biological, social, physical and economic characteristics
of the site. Keep
in mind the long term future of your business; will the site be as
productive several years down the road? What factors might change? See the categories
below for more information on characteristics to consider when selecting
a site. Biological
Factors
Plankton
productivity: Phytoplankton abundance is one of the controlling
factors in the growth rate of shellfish. In general, the more opaque
the water, the richer the plankton layer, (aside from those areas influenced
by silt or other inorganic sediment floating in the water). The secchi
test, in which a 20 cm white disk is lowered into the water, is a simple
way to test productivity. If the disk disappears before reaching five
meters from early spring to fall, the site is probably sufficiently
productive. Avoid backwater areas where currents are weak as this can
lead to decreased nutrient/plankton availability, higher water temperatures
in these areas can lead to spawniness. Water
Quality: Because shellfish filter nutrients from the water
column, they are highly susceptible to pollutants. Site selection
should include testing of sea water as well as nearby watersheds;
factors such as the presence of marine mammals and human development
may affect water quality. Alaska requires that shellfish farms
pass the National Shellfish Sanitation Program requirements before
the first product is sold. Contacting the DEC lab in Palmer (907-745-3236)
for a water quality test is recommended before taking the time
and money to develop a site.
Paralytic Shellfish
Poisoning: Though testing for PSP is not required to obtain
a permit, it is highly recommended that potential farmers determine
the short and long term risk of PSP toxin buildup before committing
to a site. Contact the DEC lab in Palmer (907-745-3236) for assistance
in taking samples. Fouling: A
mariculture site should be free of excessive fouling. Caused by the
growth of marine organisms on shellfish gear, undue fouling requires
extensive labor to keep gear clean. Observing the abundance of barnacles,
mussels, sponges, tunicates, and seaweed on nearby shores and placing
test gear in the water before committing to a site are good ways
to determine the risk of fouling.
Social
Factors
Land
use conflicts: Pay attention to the current and potential development
on the land and water around your prospective farm site. Ask yourself
if your farm can coexist with current land use patterns. Who
owns adjacent land and what are its designated uses? Might the owners
be opposed to a farm? Neighboring land and water users might object
to the placement of a farm for aesthetic reasons, including locals
or tourists organizations using the water, beaches, or nearby land.
Others may not wish to comply with the stringent water quality standards
imposed by a mariculture operation, (development projects), or because
they desire to build infrastructure on the shore for land operations,
(docks and transfer facilities). Could future development projects
affect your water quality? Potential
shellfish farmers should contact land owners neighboring their prospective
site to determine their concerns. A good dose of diplomacy may be
in order.
Physical
Factors
Currents: A
firm knowledge of the oceans characteristics in and around the
potential site is essential for site selection. Strong currents can
cause the culture gear to tangle and damage the shellfish. The presence
of strong currents will also affect your farms construction.
On the other hand, an area with low circulation limits the nutrient/plankton
abundance in the water, potentially diminishing shellfish growth; or
allowing the termperature to rise until spawniness occurs. Wildlife: Spend
some time observing wildlife in the area of your prospective site.
Are there large populations of seabirds or other animals that could
prey upon your shellfish or otherwise disturb your operation? Do
you have the necessary equipment to protect your crop from predation?
Additionally, mariculture operations are prohibited within a certain
distance of seal and sea lion haulouts, anadromous fish spawning
streams, seabird colonies, and other wildlife areas. Economic
Factors
Isolation: Though
developing a shellfish farm in a secluded, wilderness setting might
appeal to you, keep in mind transportation logistics. A site should
be close enough to transportation corridors that moving supplies, crew,
and product to and from the site is not prohibitively expensive. The
site should also be accessible in rough weather. Proximity
to Other Farms: Most shellfish farms in Alaska are small operations
that can benefit from cooperation with neighboring farms. Resources
such as personnel and expensive equipment can be shared by a number
of operations, reducing the costs for each and allowing the coop
to hire full-time employees. Joint marketing and product deliveries
can also increase the economic success of your farm. |