Methods to improve the body color of adult eel

The body color of eel plays an important role in the production of eel. Raising eel with good body color is eagerly expected by all farmers, and it is also a subject that many feed factories have been exploring. In order to solve the problem of eel body color, we must first understand the causes and influencing factors of eel body color.

The production of body color of eel

The body color of eel is mainly caused by many factors, such as carotenoid, melanin, pterin and guanine.

Factors affecting the body color of eel

1. Oil, antioxidants, vitamins and other substances in the feed can protect the pigment from damage, which are conducive to the absorption of carotenoids by fish, while the higher concentration of calcium in the feed will reduce the absorption of carotenoids and affect its deposition effect.

two。 The physical properties, particle size, stability and types of carotenoids are related to the deposition of carotenoids in the body surface and muscle of fish.

3. The water temperature, dissolved oxygen, plankton and the duration of feeding in the culture environment will also affect the pigment deposition rate.

4. The health status of fish will affect the feed intake rate and digestibility of fish in the process of culture, thus affecting the absorption and utilization of carotenoids, the deposition of carotenoids in body surface and muscle, and the color of fish and meat.

5. The oxidation and lipidation of feed may reduce the deposition of pigment in fish.

6. Lack of vitamins leads to blackening of body color, so appropriate amount of vitamins should be added.

Coping strategies

The use of good quality fish oil, such as refined whole oil, can make the eel closer to the sky blue after long-term use. Some seaweed and spirulina products are often added to the feed, which are beneficial to the improvement of eel body color. The vitamins in the feed should be complete to facilitate the deposition of eel body color and avoid blackening or bronzing. Minerals should be the first choice for products such as chelating mineral essence, and the great influence factor of the bronzed color of eel is caused by the imbalance of minerals. The digestion and absorption rate of feed should be high, otherwise the body color of eel is difficult to deposit normally. Some digestive substances can be added to the feed, such as "Suijing" and so on.