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Development conditions
Choosing the line sea or intertidal zone suitable for the growth of seaweed farming, and tidal location, suitable flow, rich in nutrients, moderate proportion of seawater in the tidal flat waters.
(1) Gulf: It is advisable to choose the southern bay where the winter storm is small, the water flow is smooth, and it is warmer and not easy to freeze.
(2) Substrate: The bottom substance is suitable for stumbling, so it is not easy to damage the breeding equipment.
(3) Tidal level: Inter-tide with abundance Floating culture is generally chosen to be suitable for the average tidal time 1.5-3 hours in the tidal level near the Xiaogan Tide Line.
(4) Water flow: The seawater flow rate in the laver cultivation area is preferably 10-30 cm per clock.
(5) Nutrients: Select NO3-N and NH4+-N content higher than 50 mg/m3 sea area.
(6) Seawater specific gravity: The proportion of seawater suitable for the growth of seaweed is 1.018-1.022.
Culture method
(1) Pillared culture: Usually, rows of bamboo are painted on the intertidal zone suitable for the growth of seaweed, and the net curtains are horizontally attached and the height of the curtain can be adjusted.
(2) Fengfeng type farming: The net curtains are fixed on short legs and placed in rows on the beach, and their characteristics can float with the fluctuation of tides.
(3) Full-floating aquaculture: the subtidal zone aquaculture, usually adopting 10 mu for a culture net frame, 60 net net curtains hanging, and net curtains not exposed to the water surface.
Culture net curtain
The aquaculture net curtain is made of polyethylene and vinylon blended fabrics. The commonly used cable specification is 70 shares, 90 shares and 110 shares. The net float specification adopts a total floating culture of 1.618m, Fengfu uses a 22m small curtain, and also adopts a full floating curtain. .
The shell spore seedlings were dried out of seedlings, subcultured, cultivated and managed, and harvested in stages.
Tripod emergence
At present, full-floating aquaculture sea nursery usually uses a tripod to emerge seedlings, that is, using small bamboo poles and square floats and other equipment. The support is exposed to the surface of the water in a triangle, and the net curtain receives light on both sides of the triangle to achieve the seedling effect.
There is no need for bait for seaweed cultivation, seaweed is algae, and its growth is based on the absorption of nutrients in natural sea areas. Therefore, fertilization methods can be applied to thin sea areas.
Refrigerated net technology, which will soon be stored in the sea after the sea seedlings cool, the freezing temperature is controlled at about -25 °C, refrigerated temperature of -18 °C, and then stocked in the sea, can improve the quality of seaweed and prevent disease, It is the currently adopted breeding technology
Laver farming
The development of porphyra usually refers to the cultivation of the fronds of seaweed, ie, through shell spore seedlings, dry seedlings in the sea, daily management and processing.