Saccharina Seeding

Due to the complex life cycle of Saccharina a dedicated hatchery is required to produce seed for cultivation at scale. In the hatchery process, zoospores from the mature plants will be collected on either seed frames or curtains made from palm fibre or vinolyn fibres. The production of these ‘seed collectors’ is very time-consuming and labour intensive and currently mostly done by hand.

The seed collector frames (45x55cm) for 150-200m of seeded fibers is the common unit in South Korea.

Preparing seed frames at a small hatchery in South Korea.

Prepared seed curtains are stored in recirculating water tanks in dedicated hatchery facilities in China. (Photo courtesy of Innovation Norway China)

Preparing seedlings ropes before transferring to offshore kelp farm, Late October in Rongcheng Shandong province, China. (Photo courtesy of Innovation Norway China)

(Manila) coir rope used for seedling production in China. (Photo courtesy of Innovation Norway China)

Automatic ‘sewing machine’ for insertion of seed fibers to cultivation rope, at the inventor’s garage in South Korea.

In South Korea, a common method of attaching the seed material to the culture line is by inserting small pieces of the seed string (2-3cm) into the culture line. Roughly 70% of the farmers already use a machine that automatically cuts and inserts 2-3 cm of seed strings into the culture line. The seeding machine enables old ropes to be reused, because it can work with different rope sizes/strengths. 

Another method that is sometimes used is twine seeding, in which the seedling rope is wrapped around the cultivation rope without the manual attachment of individual seedlings. However in this method, seedlings are easily damaged and final yields tend to be lower.

The seeded lines with young sporelings will be moved to a nursery site when the temperatures at sea drop below 20°C before being deployed at the farm site. 

The seed material will be produced between early June till October (while sea water temperatures are above 20°C). 

In Japan, a common method of attaching the seed material to the culture line is by inserting small pieces of the seed string (2-3cm) into the culture line. Roughly 70% of the farmers already use a machine that automatically cuts and inserts 2-3 cm of seed strings into the culture line. The seeding machine enables old ropes to be reused, because it can work with different rope sizes/strengths. 

Another method that is sometimes used is twine seeding, in which the seedling rope is wrapped around the cultivation rope without the manual attachment of individual seedlings. However, in this method, seedlings are easily damaged and final yields tend to be lower.

The seeded lines with young sporelings will be moved to a nursery site when the temperatures at sea drop below 20°C before being deployed at the farm site. 
 

In Japan, the seed material will be produced between early June till October (while seawater temperatures are above 20°C).

In China, the seedling material is grown at the nursery site until they reach about 15 – 20 cm and they are then clamped onto the rope and cultivated at the grow out site. This process is done manually and consequently it is very labour intensive. 

The seeded lines with young sporelings will be moved to a nursery site when the temperatures at sea drop below 20°C before being deployed at the farm site. 
 

The hatchery season can start as early as mid/late August in Shandong province and last into mid November in Fujian.