When it comes to crayfish, they will always be labelled with negative labels such as "specialized food waste" and "drainage cultivation".
In addition to the revival of local fish ponds by local companies, 800,000 Hong Kong-produced crayfish have been raised in large quantities this year, hoping to "wash the bottom" of crayfish.
They can live in layered shrimp houses like modular houses, or they can be polycultured with gem fish. The main products are "Hong Kong Produce", "High Quality" and "Certified by Food Safety". I also hope that this experience can revitalize the fish ponds, attract young people to join the industry, and revitalize the fish farming industry in Hong Kong.
▼Hong Kong-produced crayfish will be available at the end of the year as soon as possible▼
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Following the local breeding of hairy crabs, each worth 10,000 yuan worth of "unforgettable", Eco Fish, Shrimp and Crab Technology Co., Ltd. has another new product. This year, it will try to breed Australian crayfish (commonly known as crayfish), and 800,000 will be launched at the end of this year at the earliest. In the market, the price is 240 yuan per kilogram, an average of nearly 20 yuan per piece.
Named "Dragon Dragon" to avoid negative labels
The crayfish with the scientific name "Procambarus clarkii" was popular in the mainland in the early years, but it was accused of being omnivorous and could still survive in polluted water sources, which discouraged many Hong Kong people.
Cheng Shihao, one of the founders of the company, said, "The name "Crayfish" is so bad that it is thought to live in a breeding environment like a dung canal." In order to avoid confusion, it was decided to name it "Ganglong".
Zhuang Enjie once participated in the breeding of Australian crayfish in industrial buildings and established a database for the reference of the breeding industry.
(Photo by Ou Jiale)
From industrial building to fish pond farming
In recent years, "post-90s" have experimented with breeding Australian crayfish in industrial buildings. They have successfully reproduced shrimp seedlings on their own and established a database to improve survival rates. This year, they successfully introduced "ecological fish, shrimps and crabs" in an indoor farm covering an area of 20,000 square feet in Baini.
There are 120 canvas breeding ponds in the farm.
Calculated by placing 10 floors of shrimp houses in each pond, a two-square-meter aquaculture pond can raise up to 300 crayfish at the same time, with an annual output of 30,000, which is expected to pay back in one year.
Cheng Shihao predicts that the demand for Australian crayfish that can be supplied throughout the year will increase to 20 million in two to three years.
Zhuang Enjie, secretary-general of the Sustainable Aquatic Development Research Association, who has participated in industrial aquaculture, is the consultant of the project.
He said that crayfish will kill each other when foraging at dusk, and the loss rate can be as high as 80%. Therefore, the most important thing is to provide enough feed, enough shrimp houses and separate male and female breeding, and control the temperature at 16 degrees or above. Maintaining the oxygen rate at 60% to 70% can increase the survival rate.
Corn, salmon meal, and even black water flies, which are regarded as "food waste scavengers", can be used as food for crayfish.
"Dragon" can also be polycultured with gem fish. The leftover feed of the fish and the crayfish at the bottom of the pool will not be wasted and eat up, and they will live in peace with each other.
Traditional fish farmers raise four more big fish and look forward to "Hong Kong Dragon" opening up a new way for the aquaculture industry
Traditional fish farmers have always raised the "four major home fishes" in fish ponds. They lack previous experience and dare not venture to try new species. However, in the face of competition from the mainland for cheap freshwater fish, Zhuang Enjie believes that the local aquaculture industry has to find a new way out. This farming experience is just right It is not impossible to reflect the local culture of crayfish.
Cheng Shihao also added that the erection of floating platforms in the fish ponds and the placement of crayfish breeding ponds, and the installation of solar panels on them, will bring stable subsidies and make the fish ponds more three-dimensional.
This batch of crayfish is mainly "produced in Hong Kong", "high-quality" and "certified by food safety", and uses umami flavor to keep Hong Kong people's stomachs.
(Photo by Ou Jiale)
Activating fish ponds also add technological elements
The revitalization of fish ponds must also enlarge the technological elements. The "Ecological Fish, Shrimp and Crab" fish pond in Heshang Township, which is about 10,000 square feet, has been turned into an aquaculture research center. , Crayfish, raw fish and other hodgepodge, test the effect of polyculture.
The fish pond also tried a nano-aerator. The smaller the volume of the bubbles, the faster the water will be integrated into the water. The dissolved oxygen in the fish pond has been successfully increased from about 35% to about 76%. Cheng Shihao estimates that if it is fully covered, the fish pond organisms will survive. The rate can be increased from 40% to 70%, increasing output.
Locally farmed crayfish and hairy crabs collect big data to help monitor water quality and improve the survival rate of seafood Carbon trading platform helps reduce 350 tons of emissions in the initial stage
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