Japanese Version.
https://neovisionconsulting.blogspot.com/2021/08/35succeeded-in-complete-aquaculture-in.html
In Japan, land-based aquaculture of fish and shellfish is often conducted in a closed loop, using only rehydration and no drainage, mixing sanitary tap water with a powder that is similar to seawater for sea fish. In land-based aquaculture of Japanese seafood, it seems that there are many closed circulations in which the It seems that seafood manure may be In the process of making Japanese sea products, there are many enclosed cycles in which the mixture of water and powder is used to bring the sea products closer to seawater, and the water is not allowed to drain out. Seafood can be decomposed by bacteria or used as fertilizer for rice paddies.
In land-based aquaculture of fish and shellfish in Japan, the sanitary water supply is often mixed with a powder that brings the water closer to seawater for sea fish, and closed circulation is often used with only supplemental water and no drainage. Fish and shellfish feces and urine can be decomposed by bacteria or used as fertilizer in the field. Fish and shellfish waste can be decomposed by bacteria or used as fertilizer in the field. Fish eggs are grown in test tubes and mature into adults in aquariums. & It wasn't all good! The Problem of Farmed Fish and Natural Fish (3/5), What is the reality of natural fish being overfished to feed farmed fish? In addition, insect larvae are used as an alternative to natural fish.
Crab and shrimp successfully farmed!
https://neovisionconsulting.blogspot.com/2021/09/successfully-cultivated-crab-and-shrimp.html
English Version.
Successfully grown in a test tube for complete aquaculture
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Please view the Youitube video in its original untranslated Japanese.
Comment: It seems that the feces and urine of the fish and shellfish in the tank can be used as fertilizer for fields or decomposed by bacteria. The general rule of thumb is to use a complete recirculation system, which means that the tank water is not drained but only rehydrated.
I added the information on food for fry later.
Masahiro Ishizuka, web programmer and IT consulting.
https://fujikizai.jp/2015/03/05/farming_fish/
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A type of sugar found in insects was also found to boost fish immunity.
When experiments were conducted by artificially infecting the fish with bacteria, the survival rate was greatly increased.
It wasn't all good! Farmed Fish Problems and Natural Fish (3/5)
Home / It Wasn't All Good! Farmed Fish Problems and Natural Fish (3/5)
It wasn't all good! Farmed Fish Problems and Natural Fish (3/5)
Table of Contents
What is the reality of natural fish being overfished to feed farmed fish?
Insect larvae are an alternative to wild fish
What is the reality of natural fish being overfished to feed farmed fish?
So far, the industry news has been dominated by stories like, "A mackerel may give birth to tuna.
We have reported news about the development of fish farming techniques, such as the ongoing complete aquaculture of brand-name fish.
If it is possible to farm brand-name fish such as the popular bluefin tuna, it will be possible to produce a large number of brand-name fish.
It seems to be a good thing that it will help protect natural resources designated as endangered species.
However, it seems that this is not the case.
According to the Nikkei e-edition, the author of "Pharmageddon" and
Philip Linbury, CEO of the British Livestock and Animal Welfare Organisation, is a member of the Aquaculture and Fisheries
He says the current state of the industry is blowing the whistle.
In the wake of declining natural fish stocks, no one disputes the view that fish farming is a desirable solution.
There are probably not many of them. However, Mr. Linberry rejects this view outright. Rather than reducing the burden on the ocean and protecting wild fish," he says, "fish farming is a waste of resources that could be better used to protect fish such as salmon and trout.
The ocean is taking more small fish from the sea to feed the carnivorous fish," he says.
Even if we look at the rough ratio of "fish input" to "fish produced,"
He says that aquaculture is an extremely inefficient use of fish resources.
Cited from Nikkei e-edition: http://www.nikkei.com/article/DGXMZO82827310V00C15A2000000/
According to Linberry's research above, it takes about 1 ton of farmed salmon to produce 1 ton of farmed salmon.
Therefore, increasing the number of farmed fish will accelerate the decline in the number of natural fish.
The result, he says, will be an increase in the number of people who are living in the area.
Insect Larvae to Replace Natural Fish
The immediate issue is to secure food to replace wild fish. Japan's aquaculture fisheries are already
We have found a safe and secure alternative food source that can be produced on land. It is insect larvae.
NHK's "Ohayo Nippon" broadcast in 2013 reported on the latest developments in farmed fish feed.
It said, "Instead of fishmeal based on natural fish, it can be made by humans.
One idea is to use biological insects as bait to prevent depletion of natural resources."
The tai fed with this bait grew significantly; in three months, they weighed 20% more than normal
The number of people who were able to participate in the project increased.
It was also confirmed that a type of sugar contained in the insects boosted the fish's immunity.
When the fish were artificially infected with bacteria in an experiment, the survival rate increased significantly.
Quoted from NHK News Good Morning Japan
http://www.nhk.or.jp/ohayou/
As the number of natural small fish for food has decreased and prices have skyrocketed, farmed fish raised on chemical feed have also
This has become a problem in recent years. By substituting insects, which humans can produce cheaply and as they wish, for food
If it means that even the quality of farmed fish can be improved, then there is nothing better.
With further technological development, we may even be able to feed tuna, which only eats live fish.
Insects may soon be substituted.
Related article: Secrets of Kindai's Tuna Cultivation, Achieved after 32 Years of Research
Text: FUJI-KIZAI
Since its establishment in 1960, FUJI-KIZAI (Fuji Kizai Co., Ltd.) has been providing a wide range of products necessary for the installation of tuna longline fisheries.
Fishing equipment such as aluminum sleeves, crimping tools, sleeve crimping machines, tugs, fishing lines, etc., as well as
We manufacture and sell a variety of fishing materials for professional and personal use.
We are a leading manufacturer and distributor of fishing materials for professional and personal use.
Flathead flounder, yellowtail, and chub mackerel ... Spread of complete aquaculture from eggs
https://style.nikkei.com/article/DGXMZO21035160S7A910C1NZGP00/
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9/19/2017 Food Flash
Sue, the fresh fish store owner told me that it is getting harder to catch natural fish. I was worried because I eat fish a lot, but the shopkeeper told me that the number of "fully farmed" fish, which are raised by human hands, is increasing. Are there fish on our tables that have never swum in the vast ocean?
They're raised from egg to parent by human hands.
From Dr. Morura, I hear that even when you go out to sea by boat to fish, the amount of fish you can catch has reached a plateau. This is due to overfishing and changes in the marine environment, such as global warming. The amount of fish caught in Japan is also on the decline.
However, the decrease is being compensated for by aquaculture, so it is unlikely that we will ever be able to eat them. Aquaculture means that people raise fish like cows and chickens. It accounts for about a quarter of Japan's total fishery production (including shellfish and seaweed).
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For example, 99% of the eels, 81% of the snapper, 76% of the prawns, and 53% of the yellowtail species that we all eat are farmed. Bluefin tuna and tiger pufferfish, two popular, high-end fish with great taste, are also farmed more often than wild caught.
In normal aquaculture, young fish (fry) are caught from the sea and kept in fish ponds until they grow up to become parents. The amount of fry caught in the ocean is a major factor. If aquaculture becomes more popular, there is a fear that too many fry will be caught and the number of natural fish will decrease.
This is why the technology of taking eggs from fish parents and raising them by hand has been attracting attention. The fish are raised until they become parents, and then the eggs are re-collected from the parents and re-hatched. Fish that have been raised by human hands all their lives have never swum freely in the vast ocean. The entire process, from the eggs to shipping, is managed by humans, so it is called "complete aquaculture. Even if it is difficult to catch fish during fishing, we can provide a stable supply of high quality fish to the table.
It is not easy to take eggs from the parents and raise them. It is difficult to grow artificially hatched young to a certain size, which we call fry.
You have to be creative with the type of food and the way you feed them. It is also important to keep the water temperature and light conditions in the aquarium close to natural conditions, and to always keep the water quality clean. Even if a small number of fish can be completely farmed, it is difficult to make a business out of it unless the technology to raise a large number of fry is developed.
The most representative fish that have been successfully farmed are red sea bream and flatfish, but recently yellowtail, bluefin tuna, and chub mackerel have also been introduced to the market.
Sturgeon, which is used to produce caviar, one of the world's three most prized fish roe ingredients, has also been fully farmed. Nippon Suisan has succeeded in the complete cultivation of sea cucumbers, which had been considered difficult, and is aiming to ship them after 2020.
Eels have been successfully and completely farmed, but they are not yet commercially viable. This is because they have not yet developed the technology to efficiently raise small larvae called leptocephalus, which hatch from eggs, to become the offspring we call glass eels.
It is often discussed whether fully farmed fish tastes better than wild-caught fish. People have their own likes and dislikes, but farmed fish are more fatty.
Kurose Suisan (Kushima City, Miyazaki Prefecture), a member of the Nippon Suisan Group, ships completely farmed yellowtail. Because the growth of the fish can be controlled, it is possible to change the time of year when the fish tastes best.
Winter is usually the best season for yellowtail. By adjusting the length of the day and night and water temperature, Kurose Suisan is able to grow yellowtail eggs six months earlier than usual, allowing them to be shipped in the summer with the same good fat content as winter yellowtail.
Since the eggs can be harvested whenever they want, it is easier to adjust the production volume and ensure a stable supply of fish to the table.
Fish caught in the natural sea often have a specific time of year when they are tasty. And since they eat a variety of feed, the texture and taste of their flesh is left up to nature. With complete aquaculture, it seems that the taste of the fish can be controlled.
There was a time when farmed fish were said to be drugged to prevent disease, but now vaccines have been developed to prevent disease, and the amount of medication has been greatly reduced. Now, however, vaccines have been developed to prevent diseases, and the amount of medication has been greatly reduced, making it possible to eat fish without worry.
■Fat burning with feed, moderate fat
A word from Dr. In complete aquaculture, feed for artificially hatched baby fish and their offspring (fry) is important. For example, sea bream, bluefin tuna, and yellowtail are fed a diet of minute animals called rotifers. The quality of the fish meat can be improved by feeding the fish differently.
Kurose Fisheries uses a compound feed that mixes fishmeal with soybean meal and other vegetable proteins until the fry are raised to become parents. The company says the fish smell has been eliminated. Two months before shipment, the fish are fed a proprietary feed containing capsaicin, an ingredient in red pepper, to make the meat moderately fatty.
On the other hand, it took time to identify the feed for the larvae that hatched from eel eggs. It was found that they eat food made from the eggs of the blue tooth shark, but if they are fed as is, they almost always turn into males, so female hormones are mixed in to produce females. In order for fully farmed eels to become available on the market, they need the technology to produce large quantities of glass eels more easily than they can now.
(Interviewed by Eel Seed and Seedling Mass Production Research Center, Research Institute for Aquaculture Research, Kurose Fisheries)
[Nihon Keizai Shimbun evening edition, September 9, 2017]
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