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https://neovisionconsulting.blogspot.com/2021/04/35succeeded-in-complete-aquaculture-in.html
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Success in complete aquaculture by growing them in test tubes.
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Please view the Youitube video in its original untranslated Japanese.
Comment: The feces and urine of the fish and shellfish in the aquarium can be used as fertilizer in the field 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 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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It was also confirmed that a type of sugar contained in insects enhances the immunity of fish.
When experiments were conducted by artificially infecting them with bacteria, the survival rate was greatly increased.
It wasn't all good! The Problem of Farmed Fish and Natural Fish (3/5)
Home / It Wasn't All Good! The Problem of Farmed Fish and Natural Fish (3/5)
It Wasn't All Good! Farmed Fish and Wild Fish (3/5)
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What is the reality of natural fish being overfished to feed farmed fish?
Insect larvae are replacing wild fish as food
What is the reality of natural fish being overfished to feed farmed fish?
So far, industry news has focused on the possibility of tuna being born from mackerel, and the ongoing trend toward complete aquaculture of brand name fish.
The industry news has reported on the development of fish farming technology, such as the possibility of tuna being born from mackerel and the ongoing complete aquaculture of brand-name fish.
If it is possible to farm bluefin tuna and other popular brand-name fish, it would be a great opportunity for the industry to develop a new way to harvest endangered species.
It would be a good thing for the conservation of endangered natural resources, but it seems that this is not the case.
However, this may not be the case.
According to the Nikkei e-edition, the author of "Farmageddon" and CEO of
Philip Linbury, author of "Pharmageddon" and CEO of the British Livestock and Animal Welfare Organization
He is sounding the alarm about the current state of aquaculture fisheries.
Not many would disagree with the view that fish farming is a desirable solution to declining natural fish stocks.
However, Mr. Lindberry is not so sure about this view. However, Mr. Linberry categorically rejects this view. Rather than reducing the burden on the ocean and protecting wild fish," he says, "fish farming feeds carnivorous fish like salmon and trout.
Rather than reducing the burden on the ocean and protecting natural fish, fish farming is taking more small fish out of the ocean to feed carnivorous fish like salmon and trout," he says.
Even when you look at a rough ratio of "fish in" to "fish out," aquaculture is extremely inefficient.
Even in terms of a rough ratio of "fish input" to "fish produced," aquaculture is an extremely inefficient way to use fish resources.
Cited from Nikkei e-edition: http://www.nikkei.com/article/DGXMZO82827310V00C15A2000000/
According to the above survey by Linberry, it takes 5 tons of natural small fish 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 alternative food source for wild fish is insects.
Insect Larvae to Replace Wild Fish
The immediate issue is to secure food to replace wild fish. Japan's aquaculture fisheries have already begun to produce fish that can be produced on land and are safe and secure.
The Japanese aquaculture industry has already 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 this bait grew significantly; in three months, they weighed 20% more than normal.
In three months, they weighed 20% more than normal.
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/
The decrease in the number of natural small fish as food source and the price hike have caused farm-raised fish fed with chemical feed to become a problem in recent years.
This has become a problem in recent years. The use of insects, which are inexpensive and can be produced as humans wish, as a substitute for feed has led to a decline in the quality of farmed fish.
If the quality of farmed fish can be improved by substituting insects, which humans can produce cheaply and as they wish, then there is nothing better.
With further technological development, it is possible that insects may one day be substituted as a food source for tuna, which only eat live fish.
Insects may soon be substituted as a food source for tuna that only eats live fish.
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 manufacturing aluminum sleeves, crimping tools, and other products necessary for the installation of tuna longline fisheries.
FUJI-KIZAI has been supplying fishing equipment such as aluminum sleeves, crimping tools, sleeve crimping machines, tugs, fishing lines, and other products for professional and private fishermen.
We manufacture and sell a variety of fishing equipment and materials for both professional and personal use.
We also manufacture and sell a variety of fishing materials for professional and personal use.
Flathead flounder, yellowtail, and chub mackerel... The spread of complete aquaculture from eggs
https://style.nikkei.com/article/DGXMZO21035160S7A910C1NZGP00/
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9/19/2017 Food Flash
Sue, the guy at the fresh fish store was telling me that it's getting harder to catch natural fish. I'm worried because I eat a lot of fish, but the store owner told me that the number of 'fully farmed' fish, which are raised by human hands, is increasing. Fish that have never swum in the vast ocean are now on our dinner tables?
They are raised from egg to parent by human hands.
From Dr. Morura I hear that even when you go fishing in the ocean by boat, the amount of fish you can catch has reached a ceiling. It is believed that 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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Can you get into the mood with "eels and rice bowls"? We put it to the test!
For example, 99% of eels, 81% of sea breams, 76% of prawns, and 53% of yellowtail are farm-raised. Bluefin tuna and tiger puffer fish, which are popular and high-end fish because of their 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 in this process. 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 the fish parents and raising them by hand has been attracting attention. The fish are raised until they become parents, and then the eggs are harvested 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 when fishing makes it difficult to catch fish, we are able to deliver a stable supply of 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.
We have to be creative in the type of food we feed them and the way we 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 you can achieve complete aquaculture with a small number of fish, it is difficult to make a business unless you have the technology to raise a large number of fry.
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.
In an unusual case, sturgeon, which is used to produce caviar, a fish roe ingredient that is considered one of the world's top three delicacies, 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 juveniles called leptocephalus, which hatch from eggs, into children called shirasu eels.
People often talk about whether or not 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 season when the taste is at its best.
Winter is usually the best season for yellowtail. By adjusting the length of the day and night and the water temperature, Kurose Suisan is able to produce yellowtail eggs six months earlier and ship them in the summer with just the right amount of fat as winter yellowtail.
Since the eggs can be harvested any time of the year, production can be easily adjusted and fish can be delivered to the table in a stable manner.
Fish caught in the natural sea often have a specific time of year when they are tasty. In addition, they eat a variety of feed, so 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, so we can eat fish with peace of mind.
■Fat burning with feed, moderate fat
A word from Dr. Kohmoto: In complete aquaculture, the feed used to nurture artificially hatched baby fish and their offspring (fry) is very 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 prior to shipment, the company feeds the eels 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-spotted lamprey, but if they are fed as is, they almost always turn into males, so female eels are made by mixing female hormones with the eggs. 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.
(Interviews were conducted with the Eel Seed and Seedling Mass Production Research Center of the Research Institute of Aquaculture and Aquaculture, and Kurose Fisheries.)
[Nihon Keizai Shimbun evening edition, September 9, 2017]
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