Most of the meat contains vitamin A, but fish, especially marine fish, is rich in vitamin A, as well as some other trace elements, is one of the healthiest foods, regular eating of marine fish, can live a long life.

From ancient times, primitive people's methods of obtaining food were divided into gathering, hunting and fishing, among which hunting and fishing were the most important sources of meat.

With the growth of the population, human activities have increasingly affected the lives of animals, and hunting has become a specialty in remote areas, and people have shifted from hunting and fishing to farming, and the source of food has begun to increase.

The fish in rivers and lakes, even if they are stocked, are limited, and unless they are cultivated at a high density as in later generations, his volume ratio is not high.

However, marine fishing is an exception.

Like rivers and lakes, there are relatively few fish in the ocean, but unlike rivers and lakes, the total volume of the ocean is much larger than that of rivers and lakes.

Not to mention the deep sea, let's just say that it is the continental shelf of the offshore sea, with a water depth of about 200 meters, plus a huge area, the Bohai Sea, which is the smallest sea, and the total volume is not comparable to that of rivers and lakes, let alone the Yellow Sea, the East China Sea and the South China Sea.

This is not the 21st century, because of the emergence of a large number of trawlers, overfishing, so that the ecological balance of the ocean, on the verge of collapse, this is the ocean that has not been claimed for hundreds of millions of years, throughout the East China Sea and the South China Sea, there are many kinds of fish.

Even in later generations, under the premise that the entire ocean is excessively claimed, marine fishing is also a very important project, and some island countries, or countries close to the sea, sea fishing has always been an important income.

For example, Japan, one of the largest fishing countries in Asia, and even in the world, accounts for a considerable part of Japan's gross domestic product (GDP) every year in terms of fish-related economy, which was once the second largest economy in the world and the third largest economy in the world after being overtaken by China.

Why is it that in later generations, animal protection organizations have repeatedly broken out in the world, accusations against Japan, but under such powerful accusations, Japan still insists on whaling and catching precious seafood, which is nothing more than profit.

A whale, calculated according to a blue whale of about 100 tons, his value is as high as 10,000 US dollars, which is still only the most basic price, mainly meat, in fact, the value of whales is much more than that.

A heavily armed fishing boat, under the premise of carrying a large number of advanced tools, can catch 8 to 10 whales at a time, even the most basic price, is as high as 100,000 US dollars, this is the fundamental reason for attracting Japan, the total annual sales value of whale meat in Japan alone, is as high as 32 million US dollars, which is also the fundamental reason for repeated bans.

With its own traditions, coupled with the huge profits of tens of millions of dollars in base wholesale, and the related industries derived from it, it can be said unceremoniously that if whaling is banned, it will be a huge blow to Japan's maritime operations.

In the 21st century, when the oceans are gradually deteriorating due to overfishing, marine fishing is so popular, let alone this era, which has not been fished for hundreds of millions of years.

Human beings change the world, starting from the surroundings, forests, to land, to crossing lakes and rivers, to expanding to the seaside, and this process starts to slow down here, and the ocean, that is not something that can be intervened casually.

In this era, the most human beings have set foot in the offshore sea, and it has not yet been fully developed, and it is not even consumed by relying on the nets of ordinary fishermen.

The reason why a creature is a creature is because it can continue to reproduce, and without natural predators, a few creatures, after one or two hundred years, will become thousands.

In the ocean, there is its own ecological balance, coupled with the mobility of the ocean, there is no such strange thing as Australia, there will be no certain creature that can occupy all the resources in the ocean.

A complete ecological balance, from the bottom to the top, is the hierarchy, and the limit that determines the total amount is not the highest, but the lowest.

The lowest level of existence in the ocean is plankton and seaweed, the latter is lower than the former, and these two basically live on the continental shelf, so the vast majority of the ocean, most of the organisms, live on the offshore continental shelf.

When exposed to sunlight, seaweed can synthesize oxygen, grow on its own, and become food for herbivorous fish, and so on, a large number of carnivorous fish are arranged in the next place.

Without enough seaweed, the entire food chain will be affected, especially if there is no external force, and this balance is quite stable.

In this case, the automatic recovery of the food chain will allow the small-scale effects to be replenished very quickly.

For example, if a large number of demersal fish is consumed, it will not be consumed forever, as long as the seaweed on the seabed is still there, those fish that may have been eliminated due to lack of food may have a chance to grow, and then for a period of time, the original balance will be restored.

This is the natural recovery of the biological chain, and even long-term fishing will degrade the entire population, for example, on the grassland, there were wolves in the past, and after the wolves died, it seems that cattle and sheep have no natural enemies, and they can live a life of eating, sleeping, and eating.

But after a long time, the population began to degenerate, the old, weak, sick and disabled began to increase, and even there was a danger of extinction, and the final solution was very simple, get a few wolves over, increase the threat, and the survival of the fittest, the health of the population would definitely rise.

Proper control and fishing are also beneficial to living organisms.

This is a double benefit for the navy, and on the premise of stabilizing the surrounding ecological balance, it also gives the navy a lot of fishery resources.

Fish enrichment is affected by only one factor, and that is food, which is generally a natural large fishing ground, which is often located in the place where ocean currents meet.

The confluence of the two ocean currents, the lower and upper layers, will collide, and the nutrients located on the seabed will be enriched, so that the nutrients in the whole seawater will increase, and plankton will begin to breed in large quantities, which in turn will attract a large number of fish.

This is the balance of the biological chain, the vast majority of organisms, most of them, rely on instinct to act, which also makes the location of these fishing grounds relatively fixed.

In East Asia, there is a world-class fishing ground, one of the four major fishing grounds in later generations, even in the Northern Song Dynasty, this has not changed, and the current Hokkaido, where the two ocean currents meet, produces a large number of fish.

When the large-scale construction of sailing ships is completed, there is no problem in going to Japan on a large scale, but in Hokkaido, it is a bit dangerous, and the distance is on the one hand, the convergence of cold and warm ocean currents will bring up the nutrient-rich substances at the bottom, but it will also strengthen the activity of the ocean, but it will also form a large number of wind and waves, and even undercurrents.

This is also the foundation of the four major fishing grounds, which have not been completely famous until modern times, and there are many fish, but they are also dangerous.

The sailing ship of the Dinghai Navy does not have to consider the problem of wind and waves, which itself is in a high sea environment, but it is not very convenient to trek through mountains and rivers, unless the Dinghai Navy can get Hokkaido in its hands.

At this time, Hokkaido was not yet part of Japan, and there were some people living in Hokkaido, the Far Eastern race, and at present, Japan's traditional territory has only 3 islands.

Hokkaido is a very good place, not to mention the fishery resources, but also the area itself, it is very large, much larger than Taiwan, and the location is important, not only can hold Korea and Japan, and even if you can land from the north, you can even sweep the northern peoples.

In the future, even if the navy develops and has strong strength, it will not casually start a war with the Northern Song Dynasty.

Even if the Ding Navy has hot weapons, even if a large number of immigrants from the Northern Song Dynasty have a large population, it is only one or two million, and the small population itself makes his control weak, plus the Northern Song Dynasty and the Ding Navy are inextricably linked, once the war starts, God knows whether the people can run away.

But the northern nomads are different, not the Mongol Jurchens, but the Liao State, which is a feud with the Northern Song Dynasty, there is no problem in beating them, and their morale is high.

The control of the same nomads is weak, and Yuan Hao, who has lost power, with 10,000 men and horses, let the entire Liao people turn on their backs, and almost half of the population has been lost, what if it is replaced by the Dinghai Navy?

The Ding Navy could not start a war with the Northern Song Dynasty, but when it came to dealing with the nomads, there was no such problem, and the firearms themselves restrained the nomads, plus the productivity of the Ding Navy.

The problem that plagued the Ming army was not a problem at all in the Dinghai Navy, as long as a few railways were built, where the army fought, the railways would be built, plus a series of fortresses and cities, and the land taken in the future would be firmly controlled in their hands.

The land that the feudal dynasty could not control was because these lands did not have the ability to produce food, and the cost of transporting them from the Central Plains was too high.

However, there is no such problem at all, the railway can quickly transport all kinds of materials to the front, and the control of the fortress and the city can make the territory that has been laid down completely controlled, even if it is encroached, it can also control the surroundings.

As for the aftermath, even the surroundings, even the north and south, have been taken down, showing some force, what else can the Northern Song Dynasty do, Zhao Xin is the son of Renzong after all, and the strength from the outside to the inside is the root cause of his final entry.

Hokkaido, at present, is too far away from Zhao Xin, if he really goes to it, no matter how rich the fishery resources are, the simple expenditure on the road will make him unbearable, fortunately, in China's coastal waters, there is not no fishing ground.

In China's coastal waters, a large area of the continental shelf, these are the natural places of the fishing grounds, there are many rivers, the estuaries of the rivers, the water sent into the sea from the rivers, not only with strong kinetic energy, but also carries a large amount of nutrients.

The impact and the material carried by it make most of the estuaries of rivers and lakes more plankton, which attracts a large number of fish.

Under the premise that animal husbandry has not reached a certain level, marine fishing can obtain massive meat resources in a short period of time, and there is no need to worry about depletion, at least, there is no problem of fish being caught before tens of thousands of trawlers.

With a large number of cheap fish, the quantity is guaranteed, and the cost is quite low, it can greatly solve the problem of meat.

According to the current standard, 4 million catties of meat per month are solved by pigs, and 20,000 pigs are needed, but what if fish is used to solve the problem?

In the case of whales, it is 40 blue whales of about 100 tons, of course, so far, the Dinghai Navy has not been able to catch whales, but what about other small fish?

As long as the use of trawl fishing boats, the efficiency of fishing must be improved on a large scale, with 200 modified fishing boats, harvesting 20 million catties of fish per month, which is no problem at all, which is equivalent to saying that a boat is just fishing 100,000 catties, converted, tons, but 50 tons.

50 tons of fish is a lot, in such a place where fishery resources are very rich, maybe a net down, is a few tons of fish, in key places, a few more fishing nets can be enough.

20 million catties of fish, for the entire Dingjun, absolutely enough, among the many meat, the content of vitamin A in the sea fish, should be more, there are 10 catties of fish per person, plus 2 catties of meat, at least can reduce night blindness on a large scale, which is a huge benefit for the Dingjun.

The working hours of workers can be relatively extended, and the utilization rate of machines will increase from about 16 hours a day to 24 hours, which seems to be only a one-third increase in efficiency, but if it is not shut down for a long time, there is no process of starting and slowing down, and the efficiency should be increased by at least 50%.

Similarly, the intake of a large amount of protein and fish will reduce the consumption of food and reduce the food pressure of the Dinghai Navy.

Although it is impossible for the navy to produce grain and achieve self-sufficiency in grain, if a part of the grain is converted into fishing for gain, this will not only strengthen the stability of the navy but also reduce the existence of variables.

In fact, the most important thing is that Zhao Xin hopes to use fishing to train the team.

The difference between the navy and other armies lies in the fact that the power of the same ship, in the hands of both new and experienced hands, is completely different, and the overall strength may be several times worse.

The Northern Song Dynasty did not have a tradition of the sea, and if the Dinghai Navy wanted to expand outward, it was almost inevitable that it would embark on the road of the ocean, and with a large number of large fishing boats, it would not only provide more protein supplements to the Dinghai Navy, but also allow the Dinghai Navy to have a number of stable and reliable naval forces, which was particularly important for the Dinghai Navy.

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