The following are some aquatic animals with a relatively high requirement for L-threonine:
I. Fish
Rainbow Trout: Rainbow trout have a high demand for protein. In their feed, L-threonine is an important limiting amino acid. Studies have shown that an appropriate level of L-threonine in the feed of rainbow trout is conducive to the improvement of their growth performance. The lack of L-threonine will lead to problems such as slow growth and reduced feed conversion rate of rainbow trout.
Common Carp: The common carp is a commonly farmed fish species and also has a significant demand for L-threonine. It participates in various physiological processes in the body during the growth of the common carp, such as protein synthesis and immune regulation. When the content of L-threonine in the feed is insufficient, the growth rate of the common carp will be significantly inhibited, and its immunity may decline, making it more susceptible to diseases.
Tilapia: Tilapia is a euryhaline fish species with characteristics such as fast growth and a diverse diet. L-threonine is crucial for the growth and development of tilapia. It plays a key role in the muscle protein synthesis of tilapia. An appropriate amount of L-threonine can improve the muscle quality and growth performance of tilapia, making the fish stronger.
II. Shrimps
Litopenaeus vannamei: Litopenaeus vannamei is one of the shrimp species with the highest aquaculture production in the world. During its farming process, L-threonine is one of the essential amino acids. Litopenaeus vannamei has a specific demand range for L-threonine in the feed. An appropriate level of L-threonine can promote the molting and growth of the shrimp and enhance its immunity, which helps to improve the survival rate and yield of farming.
Penaeus monodon: Penaeus monodon is large in size and has a fast growth rate, but it has strict requirements for feed nutrition. L-threonine occupies an important position in the nutritional requirements of Penaeus monodon. It not only affects the growth rate of the shrimp but also is related to the stress resistance and reproductive performance of the shrimp. Adding an appropriate amount of L-threonine to the feed can improve the farming efficiency of Penaeus monodon.
Aquatic animals of different species and at different growth stages have different requirements for L-threonine. In actual aquaculture, adjustments need to be made according to specific situations to meet the nutritional needs of aquatic animals and improve the aquaculture efficiency.