Offshore porphyra yezoensis thallus cultivation method

Abstract

The invention discloses an offshore porphyra yezoensis thallus cultivation method. During porphyra yezoensis thallus cultivation, a sea area with the water depth of 10m-40m at low tide is selected, seawater flow velocity is 0.5m / s-3.5m / s, and total nitrogen content is 150mg / m<3>-500mg / m<3>. A full-floating raft frame is adopted, parallel to a prevailing wind direction or tidal current, arranged ina wave-heading manner along the current and divided into a plurality of large areas, frame floating ropes with the diameters of 18mm are arranged on the peripheries of the large areas, and the framefloating ropes at four corners of each large area are fixedly connected with pile foundations sequentially through empty ropes and pile cables. Each large area is divided into a plurality of small areas, a web curtain is connected into each small area through a middle floating rope, and corners of the web curtains are hung on the corresponding floating ropes. By layout of culture large and small areas, production operation is facilitated, seawater flow is also facilitated, nutrition supply for porphyra yezoensis thallus cultivation cannot be affected by seawater depth and can be performed in adeeper sea area, and yield, quality and sustainable development can be ensured.

Description

technical field [0001] The invention relates to a laver cultivation technique, in particular to a method for cultivating the fronds of the off-shore Porphyra variegata. Background technique [0002] At present, there are about 450,000 mu of Porphyra zebra fronds cultivated in the coastal areas of Jiangsu, accounting for more than 98% of the cultivation area of ​​P. In 2016, Jiangsu inspected and quarantined a total of US$161 million of exported laver, and Jiangsu Province has become the largest base for raising, cultivating, processing and exporting laver in the country. [0003] However, in 2017, the yield of porphyra thallus cultivation in Jiangsu was less than 1 / 3 of the normal year, and the quality of thallus cultivation dropped significantly. , leading to a sudden reduction in the space available for the cultivation of laver foliage; the density of foliage cultivation is too high, and the phenomenon of mass rotten vegetables occurs frequently; The environment is deter...

AI Technical Summary

Problems solved by technology

[0003]However, in 2017, the yield of porphyra thallus cultivation in Jiangsu was less than 1 / 3 of the normal year, and the quality of thallus cultivation declined significantly, leading to this result There are many reasons for this. For example, the cultivation area of ​​thallus is increasing year by year, which leads to a sudden decrease in the space available for the cultivation of laver thallus; the density of thallus cultivation is too high, and the phenomenon of group rotten vegetables occurs frequently; the cultivation technology of thallus The level is low, and the idea of ​​relying on the sky is still dominant; the pollution is aggravated, the ecological environment is deteriorating; the seaside is windy and the waves are strong, etc., the cultivation of fronds is risky and costly, etc.

During the cultivation period of laver fronds, in a certain sea area, the resources needed for the cultivation of laver fronds that the ocean can provide are limited, such as space resources, various fertilizers including trace element resources, etc. Once these resources have a certain factor If it cannot meet the needs of laver frond cultivation, there will be a short board effect, the yield and quality of laver will be greatly reduced, and it will be difficult for laver frond cultivation to continue to develop

[0004] At present, the cultivation of Porphyra zebra foliage mainly adopts the cultivation modes of semi-floating flow, inserting stems, and full floating flow. As the material, moso bamboo is still used for more than 60%. Due to the shortness of moso bamboo and poor ability to withstand wind and waves, etc.; now some sea areas use glass rods to replace moso bamboo, but even if fiberglass rods are used to replace the traditional laver fronds. The used moso bamboo and seaweed fronds are only cultivated in the offshore area within 12m

Images