Technical of raising commercial geoduck (part1) – The Hanging style

There are two main forms of culture: cage hanging on hanging cage or fixed rig, referred to as “suspension culture” and feeding on natural beach or park renovation, referred to as “bottom feeding”.
Stocking seasons: from April to June each year.

Culture time reach commercial size (over 50 grams / head) from 1 year or more.

Every form of farming is done through 5 steps. Here is the step by step detailed instructions of different animal forms.

1. hanging raising techniques

1.1. Site Selection

Locations are selected to have a certain depth, the depth lowest ebb when an average of about 3m. The salinity of the water year round from 28 ‰ or more. Water clarity over 2.5 m. Good water flow and composition of phytoplankton abundance, freshness without water, not influenced by wastewater

twelfth. Gantry machining and hanging cages

& Bull; Cages:

– Cut the nets so that enough to line the entire inside of the cage.

– Cut the bottom mesh lining enough so that the bottom end and fold lined up perpendicular to the cage with a height of 12 cm.

– Using a needle and sew the 2 layers of plastic pressed into a cage and fixed as it did for cages.

– Do optic wire hanging cages with larger type, form, as it did for the cages.

– Cut 2a = 20mm mesh cage lid (if available cage plastic cover does not need to do a grate).

& Bull; Fixed Suspension brackets:

If they do not have friends to hang fixed rigs. Materials and how do fixed gantry hanging like truss hanging in the nursery. Staging can make multiple rows parallel and perpendicular to the flow of water.

Of particular note is the right platform in place of the depth of 5 m above the edge of the waves or tides below the most (the 0 Charts) by 0.5 m.

1. 3. Technical stocking

Usually stocked with 20-25 mm shell length. Density: 30-50 fish / cage, equivalent to 200-300 / m2.

Stocking sequence:

– For the 7-8 cm thick sand into the cage.

– Hang the cage so that the cage underwater remains submerged.

– Get the finger poke a hole in the sand as the fertilizer evenly over the sand and drop into each hole 1 child. Do not drop the seed was broken shells.

– Forcing the lid cage cage and slowly drop down to the specified depth:

+ With Friends: Drop 2.5 -3.5 m deep.

+ With fixed gantry: bottom cages from 0.3-0.5 m from the beach.

1.4. Management and care

– Each month, pulling the cage to 2 times on most days and used tidal net wash brush the outer cage. Removing all foreign objects inside the cage out.

– Get hands dig down to a depth of 1/2 sand thickness of the sand layer, if detected place with black sand, a sign there may be some dead geoduck, to remove and replace the sand geoduck death each.

– Check wire hanging cage and the cage lid, crabs or fish if tearing off the net cord or risk must be replaced immediately. Outside the cage if there are more galaxies, sun stick, a knife built pry, whittled away at all.

– Check the gantry, horizontal bracing is if the pile and stick galaxy and sun damage, to be replaced immediately.

– Breeding of friends hanging out, when to drop the cage rain down the maximum possible depth. After the rain waiting for the return to normal salinity pull up at the specified cage.

– After the rain one day, to check if there is a problem to be dealt with right away.

– Check the growth per month 1 time doing at the nursing instructions.

– From the 2nd month onwards, gradually increasing the sand into the cage to 10 or 15 cm. If the cage has a height of 30 cm, the thickness of the sand can be up to 20 cm.

1.5. Harvest

May charge and collect the sniper or drop into a stage set under water before transporting to market.

 

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