CATDOLL : CATDOLL: What is the farming environment like for salmon?

1. What is the farming environment for salmon?

Under natural conditions, salmon like to live in clear, unpolluted waters. The extreme temperatures for their survival are 0℃ and 30℃, and the optimum temperature for their growth is 16～18℃. They eat vigorously and grow rapidly within the suitable temperature range. Below 8℃ or above 20℃, their appetite decreases and their growth slows down. They are fish that like to swim against currents and like oxygen. Abundant water and the stimulation of water flow can maintain good material metabolism of salmon and promote their growth. Therefore, salmon are mostly farmed in flowing water, and the suitable water flow rate is 2～30cm/s. They have high requirements for dissolved oxygen in water, and the suitable dissolved oxygen content is above 6mg/L. The optimum pH range is 6.5～6.8. They like clear, transparent, and unpolluted water bodies. They are euryhaline fish and can live in seawater and grow in freshwater. Under artificial breeding conditions, they have gradually turned to omnivorous, can eat artificially formulated granular feed well, and can be intensively domesticated.

Reproduction

Although there are many types of salmon, the current scale of aquaculture is small and has just started. They can spawn naturally under pond conditions and generally reach sexual maturity in 2 to 3 years. The spawning water temperature is below 15°C, the suitable water temperature is 4 to 13°C, and the optimal water temperature is 10 to 11°C. The spawning period in Beijing and Shanxi is from December to February of the following year; in Heilongjiang, it is from March to May. In the natural environment, mature salmon often choose rivers with clear water, currents, and gravel bottoms as spawning sites. Generally, they can spawn multiple times, with each spawning amount of about 2,000 to 3,000 eggs. The eggs are round and sink.

2. There is a lot of salmon on the market now and it’s cheap. Is it artificially cultivated?

I once watched a program called Animal World, which introduced salmon. Salmon is very difficult to cultivate artificially, especially to breed.

3. Why does salmon represent strength?

Salmon usually grow up to maturity in 3 years. When the spawning period is approaching, the salmon suddenly miss "home". It is reported that each type of salmon of different ages migrates hundreds of times every year. July to October every year is the peak season for them to return to "home". They travel in groups and travel hundreds of kilometers. Due to their unique genetics, salmon can find their birthplace even if they are far away from "home". In order to return home to spawn, salmon have experienced the hardships of "fighting against the current", the hardships of "jumping over high thresholds" and the sacrifice of "giving their blood". This spirit is touching. The great maternal character of salmon and the personality spirit of traveling thousands of miles to find their roots and ancestors are unforgettable and admirable.

4. In Fish Leaping in Flower Viewing 2, Murong Cheng mentioned Tokishirazu. What is this? Please send me detailed information about it. I beg you!!!

The literal translation is "Toki-no-shiki", which is a type of salmon (called "salmon" by the Japanese). Unlike salmon and whitefish, "Toki-no-shiki" is not an independent type of salmon. In short, whether it is salmon or whitefish, as long as the IQ is low enough, it can become "Toki-no-shiki". "Toki-no-shiki" can be regarded as a pighead among salmon.

Generally speaking, salmon have the ability to distinguish seasons. Whenever autumn comes, salmon will swim back to the river. The Japanese call this kind of salmon that "goes home" on time "autumn salmon". Mid-October to mid-November every year is the best time to eat autumn salmon, because autumn is the breeding season of salmon. Female fish store a lot of fish oil for production, and the meat quality is the best. But there are some salmon with low IQ. They can't distinguish the change of seasons. They swim back to the river before autumn and fall into the fishermen's nets. This stupid fish among salmon is what the Japanese call "Toki-no-Know". Because "Toki-no-Know" can't distinguish the seasons, many times they have already swam back to the river in spring and summer. When they are caught, it is not the breeding season, and there is not enough fish oil. Naturally, the meat quality and taste are not as good as autumn salmon. It can be seen that "Toki-no-Know" is not only stupid, but also very bad. When the Japanese say you are "Toki-no-Know", they are actually calling you a pighead.

5. Why do salmon return?

To lay eggs, this is an instinct. Only by returning to the river can they enter the breeding period and reproduce offspring.

This process is called migration...