The Gracilaria tenuistipitata V.liui, commonly known as Gracilaria tenuistipitata V.liui, belongs to the phylum Rhododendron, Rhodophyceae, Cunninghamiae, Gracilidae, and Gracilaria. It is a tropical seaweed and is mainly found in China. Distributed in Hainan Island, Hainan Province is also an important species of seaweed cultivation. Xijiang wolfberry not only grows fast, but also has high yield and great potential for development. The agar that is produced is widely used in the food industry and medicine and health, and its economic value is extremely significant. From 2002 to 2003, we conducted a cultivation experiment of the Minjiang River in the Xingfa Farm in Hainan Province and obtained preliminary results.
First, materials and methods
1. The aquaculture pond area is 0.4ha and the depth of the pool is 1.0m. The sediment is a sand mud bottom and the bottom is flat. Both ends of the pond are provided with inlet and outlet gates, and there are sea and fresh water sources.
2. Before the seedlings were planted, the weeds in the ponds were cleared and then 300kg quick lime was used. The ponds were filled with water and then fertilized. The organic fertilizers were mainly feces of pigs, chickens, and ducks, and the inorganic fertilizers were urea and ammonium bicarbonate; Jiangjing seedlings 1200kg, stocking density 3000kg/ha. Before spreading seedlings, the proportion of seawater should be adjusted to 1.004--1.012, water temperature 14°C--23°C, pH value 6.9--7.7, dissolved oxygen 4mg/L--13mg/L, transparency 50cm --70cm, water level 0.5m--0.8m. The seedlings should be uniformly manipulated to make a thin layer on the bottom of the pool.
3. Daily management includes fertilization, water exchange, removal of algae (grass), daily measurement of water temperature, seawater gravity, pH, transparency, and water level. O, ammonia nitrogen, nitrite nitrogen, and nitric acid nitrogen were measured once every 10 days. Generally, fertilization and water exchange are performed once or twice a week, and the water quality of Xijiang River is the same as above.
Second, the test results Breeding time from August 5, 2002 seedlings to March 27, 2003 all harvested, during which a total of 6 harvests, a total of harvesting 8280kg Xijiang, the output value of 79,000 yuan.
Third, analysis and discussion
1. There are many brackish water low ponds in Hainan Island. If full use can be made of cultivated Xijiang wolfberry, they can be raised or mixed with fish and shrimp, which can reduce the diseases that currently occur in large numbers of farmed shrimp and can also be used as a pond. Potential productivity.
2. During the entire production process of cultivated Xijiang River, in particular, attention should be paid to the regulation of water quality, including the proportion of seawater, transparency, and water level. According to our observation of the cultivation conditions of Minjiang River, the optimum water environment for growth of Minjiang River is The seawater temperature is 16°C--21°C, the specific gravity is 1.007--1.001, the pH is 7.0--7.6, the transparency is 50cm--60cm, and the water level is 0.7m--0.8m.
3. The growth of Chijiang wolfberry is related to the seasons. Therefore, we should choose to cultivate Chijiang wolfberry in the most suitable season (August-December and January-March of the following year). .
4. Digging the pond in the mangrove sea area to cultivate Minjiang River, the water quality is easy to be sour, and the pH value will drop, which will definitely affect the growth of the Minjiang River. Our practice was to apply quicklime to improve soil substratum prior to the delivery of Minjiang seedlings, and practice has proven effective.
5. In order to achieve high yields, the content of nutrients in water bodies is very important. It is also essential to apply basic fertilizers and appropriate fertilizers. The water quality of the Xijiang River is better than that of the manure, which is beneficial to the rapid growth of the Minjiang River, maintaining a good exchange of water quality, and also promoting the growth of the Minjiang River.
First, materials and methods
1. The aquaculture pond area is 0.4ha and the depth of the pool is 1.0m. The sediment is a sand mud bottom and the bottom is flat. Both ends of the pond are provided with inlet and outlet gates, and there are sea and fresh water sources.
2. Before the seedlings were planted, the weeds in the ponds were cleared and then 300kg quick lime was used. The ponds were filled with water and then fertilized. The organic fertilizers were mainly feces of pigs, chickens, and ducks, and the inorganic fertilizers were urea and ammonium bicarbonate; Jiangjing seedlings 1200kg, stocking density 3000kg/ha. Before spreading seedlings, the proportion of seawater should be adjusted to 1.004--1.012, water temperature 14°C--23°C, pH value 6.9--7.7, dissolved oxygen 4mg/L--13mg/L, transparency 50cm --70cm, water level 0.5m--0.8m. The seedlings should be uniformly manipulated to make a thin layer on the bottom of the pool.
3. Daily management includes fertilization, water exchange, removal of algae (grass), daily measurement of water temperature, seawater gravity, pH, transparency, and water level. O, ammonia nitrogen, nitrite nitrogen, and nitric acid nitrogen were measured once every 10 days. Generally, fertilization and water exchange are performed once or twice a week, and the water quality of Xijiang River is the same as above.
Second, the test results Breeding time from August 5, 2002 seedlings to March 27, 2003 all harvested, during which a total of 6 harvests, a total of harvesting 8280kg Xijiang, the output value of 79,000 yuan.
Third, analysis and discussion
1. There are many brackish water low ponds in Hainan Island. If full use can be made of cultivated Xijiang wolfberry, they can be raised or mixed with fish and shrimp, which can reduce the diseases that currently occur in large numbers of farmed shrimp and can also be used as a pond. Potential productivity.
2. During the entire production process of cultivated Xijiang River, in particular, attention should be paid to the regulation of water quality, including the proportion of seawater, transparency, and water level. According to our observation of the cultivation conditions of Minjiang River, the optimum water environment for growth of Minjiang River is The seawater temperature is 16°C--21°C, the specific gravity is 1.007--1.001, the pH is 7.0--7.6, the transparency is 50cm--60cm, and the water level is 0.7m--0.8m.
3. The growth of Chijiang wolfberry is related to the seasons. Therefore, we should choose to cultivate Chijiang wolfberry in the most suitable season (August-December and January-March of the following year). .
4. Digging the pond in the mangrove sea area to cultivate Minjiang River, the water quality is easy to be sour, and the pH value will drop, which will definitely affect the growth of the Minjiang River. Our practice was to apply quicklime to improve soil substratum prior to the delivery of Minjiang seedlings, and practice has proven effective.
5. In order to achieve high yields, the content of nutrients in water bodies is very important. It is also essential to apply basic fertilizers and appropriate fertilizers. The water quality of the Xijiang River is better than that of the manure, which is beneficial to the rapid growth of the Minjiang River, maintaining a good exchange of water quality, and also promoting the growth of the Minjiang River.
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