CATDOLL : CATDOLL: Is bamboo necessary for growing laver?

Is bamboo necessary for growing laver?

The cultivation of laver in Cangnan, Wenzhou requires bamboo. The laver grows on bamboo strips and then is raised in the sea.

Farming Overview

Laver cultivation has a history of more than 30 years. The scale of laver production is small, and the production links such as seedling cultivation, marine breeding and processing have not formed a relatively complete industrial chain.

Mainly manifested in:

1. The selection of laver is not scientific. The laver is grown by itself, the spores are collected by itself, and the seedlings are raised by itself, resulting in serious degradation of the germplasm.

2. Backward breeding technology

3. Laver processing is a weak point and lacks market competitiveness.

Through the use of modern biotechnology, we will select and breed high-quality, high-yield and stress-resistant laver varieties; establish operating procedures for the cultivation of seedlings of excellent varieties and cultivation in marine areas; build a complete industrial chain from germplasm selection and breeding, seedling cultivation, marine cultivation and deep processing, realize the renewal and improvement of laver germplasm, and accelerate the laver industry's move towards standardization and scale.

Technical guidance

1. Research on the technology of breeding improved varieties of laver: Carry out biotechnology research on somatic cell cloning, artificial induction, etc. of laver, and select varieties with high homozygosity and stable excellent traits.

2. Research on large-scale industrial seed production technology of improved varieties of laver: Carry out research on indoor fruit spore seedling collection, conidia cultivation and ripening promotion of improved varieties of laver.

3. Establishment and demonstration of safe and efficient laver cultivation technology: Based on the laver cultivation characteristics and the sea conditions in Xiangshan area, establish a set of safe and efficient laver cultivation mode and technical operation procedures that can be used for large-scale production.

4. Research on deep processing technology of laver: Develop new technologies for primary and secondary deep processing of laver and carry out industrialized production. Gradually form a relatively complete industrial chain of seedling cultivation, planting and processing.

Assessment indicators

1. Breed 1-2 high-quality, high-yield, and stress-resistant varieties of laver

2. Establish a laver seed breeding center with a seedling cultivation area of ​​more than 1,000 square meters, and within three years, the seedling cultivation capacity will reach 6,000 mu

3. Develop large-scale cultivation technology for improved laver seedlings and offshore cultivation model technology; establish a 2,000-mu large-scale cultivation area for improved laver varieties, with the per-mu yield of improved varieties in the demonstration area being 30% higher than that of traditional wild varieties; the per-mu yield of improved varieties in the radiation area being 20% ​​higher than that of traditional wild varieties, and the economic benefits being increased by more than 25%.

4. Introduce one advanced deep processing equipment production line, research and develop corresponding production application technology, and develop 2-3 new products such as seaweed snack foods and seaweed beverages.

The whole process can be divided into two stages: filamentous body cultivation and thallus body cultivation.

Conidia culture

It is the process of artificially collecting fruit spores, cultivating conchospores to form conchospore branches, and finally forming conchospores. It is usually carried out in the nursery room. There are two methods: shell conchospore cultivation and free conchospore cultivation. The cultivation of shell conchospores is carried out from February to March to September. The nursery room is mostly east-west oriented, with skylights and side windows for lighting, or artificial light sources. The cultivation pool can be divided into two types: flat and three-dimensional. The former has a water depth of 20 to 30 cm, and the culture matrix - shells (mostly clam shells) are placed flat on the bottom of the pool; the latter has a pool depth of 50 to 70 cm, and the shells are hung in the pool. When cultivating in spring, select the fruit spores released by excellent laver to make fruit spore water, spray it evenly on the shells, so that they drill into the shells, and conchospores can be formed after 4 to 5 months.

The main management measures include:

① Adjust the light intensity. It is 3000 lux in the early stage, and gradually drops to about 500 lux after the formation of conchosporangium branches;

② Apply nutrient salts. Potassium nitrate and potassium dihydrogen phosphate can be applied in a certain proportion according to different growth stages;

③Control the water temperature. Make sure that the filamentous plants are not affected by high temperatures in summer and early cooling in autumn during the entire filamentous cultivation period, and ensure that the seedlings are harvested on schedule.

The cultivation of free conchoceles is to place the fruit spores in a glass bottle and let them grow naturally into conchoceles. The ecological conditions during the cultivation period are basically the same as those of the shell conchoceles of the same species of laver. Free conchoceles are mostly used as a breeding method for secondary seedling collection, but as a production method it is still limited to individual regions.

How did seaweed come from?

The cultivation of laver seedlings starts with inoculation. From the beginning of April each year, the free filaments are sprayed on the shells and cultivated in the nursery pond to form shell filaments, also called shell spores. The shells need to be washed and managed during the cultivation process. Generally, the shells are washed with a soft brush to facilitate light and promote growth. After entering the shell spore release stage, fishermen use a mechanical fixed net curtain to rotate continuously and collect shell spore seedlings onto the net curtain.

Starting from September every year, the net curtains with the laver seedlings collected are transported to the sea for cultivation. After the net curtains are fixed on the poles, they are also exposed to the sun to facilitate the asexual reproduction of the laver. At the end of November every year, the laver has grown to the stage where it can be harvested. During the growth process of laver, manual daily management is required to remove the algae that affect the growth of laver.

Additional information

Although Porphyra species are distributed in cold, temperate, subtropical and tropical waters, the species diversity is rich in subtropical to temperate waters. The geographical distribution of Porphyra in China also follows this rule, mainly distributed in the intertidal zone from the Yellow Sea and Bohai Sea to the southeast coast. In addition, there are also a few Porphyra species distributed along the coast of Taiwan and Hainan Island, and their distribution has regional characteristics. The benefits of Porphyra are:

1. Prevent goiter: It can be used to relieve goiter caused by iodine deficiency. Nori has the function of softening and dispersing nodules, and is also useful for other stagnation and accumulation.

2. Promote growth and development: It is rich in choline, calcium and iron, can enhance memory, promote the growth and health of bones and teeth; it contains a certain amount of mannitol and can be used as a supplementary food to relieve edema.

3. Improve immune function: The polysaccharides contained in seaweed can significantly enhance cellular immunity and humoral immunity, promote lymphocyte transformation, and improve the body's immunity.

Reference source: Baidu Encyclopedia - Nori

Reference source: People's Daily - The four major functions and effects of seaweed

Laver is a general term for the sea-borne algae. Laver belongs to the marine red algae. The thallus is composed of a layer of cells embedded in a thin layer of colloid, and is dark brown, red or purple. Laver can also be used as medicine and made into traditional Chinese medicine, which has the effects of resolving phlegm and softening hard masses, clearing away heat and promoting diuresis, and nourishing the kidney and heart.

A purple algae plant that grows on shallow sea rocks. There are many varieties. Gan Laver is rich in protein and iodine, phosphorus, calcium and other substances, and can be eaten. Li Shizhen's "Compendium of Materia Medica·Vegetables 4·Laver" [Collected Explanations] in the Ming Dynasty quoted Meng Shen as saying: "Laver grows in the South China Sea, attached to rocks, and is green in color. When it is taken and dried, it is purple." The life of laver consists of two distinct stages: a larger thallus (gametophyte generation) and a tiny filament (sporophyte generation). The thallus reproduces sexually, and the nutrient cells are transformed into female and male cells respectively. After fertilization, the female cells divide several times to form fruit spores. After maturity, they detach from the algae and are released into the seawater. With the flow of seawater, they attach to limestone shells and other substrates, germinate and drill into the shells to grow. Grow into filaments. When the filaments grow to a certain extent, they produce conchosporangia branches, which then divide to form conchospores. After the conchospores are released, they attach to rocks or artificially set wooden stakes or net curtains and directly germinate into thallus. In addition, some types of thallus can also reproduce asexually, transforming vegetative cells into single spores, which grow directly into thallus after being released and attached. Single spores are also one of the important seedling sources in aquaculture production.

Porphyra is a general term for the symbiotic algae in the sea. Porphyra is a marine red algae. The thallus is composed of a layer of cells embedded in a thin layer of colloid. It is dark brown, red or purple and becomes dried porphyra after being dried in the sun.

Stir-fry and then press (estimated)