Aquaculture has become a means of meeting the world's seafood needs. Shrimp, crab, and lobster crustaceans are very much in demand due to their rich nutrient content, good taste, and commercial demand. Growers are faced with the challenge of sluggish growth, infection, stress, and pigmentation issues. Scientists and aquaculture nutritionists now recommend the use of astaxanthin powder as an additive to food as a countermeasure.
Astaxanthin is a natural carotenoid pigment that offers several health and performance benefits. Astaxanthin is not just a color improver but also an excellent antioxidant that is involved in growth, immunity, and survival in aquatic animals. The following post explains how astaxanthin powder enhances growth and pigmentation of crustaceans and why astaxanthin powder is a significant part of aquaculture feed of the present times.
What Is Astaxanthin Powder
Astaxanthin is a red-orange-red carotenoid pigment of natural origin in microalgae (Haematococcus pluvialis), yeast (Phaffia rhodozyma), and seafood such as krill. Aquaculture astaxanthin is generally supplied in the form of powder and added to feed.
It has two principal functions:
- Pigmentation – providing deep red and orange coloration in crustaceans.
- Nutritional support – inducing antioxidant defense, growth, and immunity.
As crustaceans do not have the capacity to synthesize astaxanthin, feeding supplementation is necessary in order to reach the maximum performance.
How Astaxanthin Powder Supports Growth in Crustaceans
1. Supports Feed Efficiency and Body Weight
Astaxanthin supports feed efficiency by preserving metabolic function. Science has shown astaxanthin-fed shrimp and crabs to have:
- Better feed conversion ratios (FCR).
- Increased body weight gain.
- Better energy metabolism.
2. Reduces Oxidative Stress
Crustaceans that are intensively farmed are commonly exposed to oxidative stress caused by low water quality, overcrowding, and handling. Astaxanthin, the most potent of the natural antioxidants, protects cells and tissue by:
- Suppressing lipid peroxidation.
- Enhancing the function of enzymes such as superoxide dismutase (SOD).
- Fostering overall health and development.
3. Facilitates Molting and Growth
Astaxanthin is also engaged in the molting cycle, an essential growth stage of crustaceans. By stabilizing membranes and enhancing cell regeneration, it allows crustaceans to molt better and recover more quickly.
How Astaxanthin Powder Grades Pigment Crustaceans
1. Improves Shell Coloration
Deep shell color is an important quality attribute in shrimp, crabs, and lobsters. Purchasers associate deep red-orange color with freshness and quality. Astaxanthin is sequestered in the exoskeleton and flesh and is accountable for providing the desired coloration which cannot be easily mimicked by artificial coloring.
Shrimp fed astaxanthin-supplemented diets exhibit enhanced coloration compared to unsupplemented control groups.
Lobsters and crabs also exhibit improved meat and shell appearance, boosting market price.
2. Enhances Market Value and Price
Directly related to consumer acceptability, pigmentation, astaxanthin supplement realizes maximum commercial value for farmed crustaceans. Farmers obtain improved sales and competitiveness in upscale markets.
Other Benefits of Astaxanthin Powder on Crustaceans
In addition to growth and pigmentation, astaxanthin offers numerous other benefits:
- Improves immunity by improving hemocyte activity and disease resistance.
- Improves broodstock reproduction, egg quality, and larval survival.
- Improves stress tolerance, making the crustaceans more resistant to handling, transport, and environmental shock.
Industrial Application in Aquaculture
Astaxanthin powder is incorporated into formulated feed at varied inclusion levels depending on the species and application:
- Shrimp: 50–100 mg/kg feed.
- Crabs and Lobsters: 75–150 mg/kg feed.
- Broodstock feed: Higher levels to promote reproduction.
Producers must turn to nature-based sources such as Haematococcus pluvialis in an attempt to address consumers' demand for natural, safe, and sustainable aquaculture products.
Conclusion
Astaxanthin powder plays two roles in aquaculture: it increases the growth rate of crustaceans as well as coloring and marketability. With reduced oxidative stress, enhanced feed efficiency, and enhanced immune system, astaxanthin supplementation results in healthier and faster-growing crustaceans. At the same time, its coloring properties ensure that shrimp, crabs, and lobsters become the vivid colors required by consumers.
With increasing aquaculture, astaxanthin powder is an extremely safe, natural, and efficient method of enhancing productivity and profitability of crustacean culture.
References
Chien, Y. H., & Shiau, W. C. (2005). The effects of dietary supplementation of algae on the survival and growth of juvenile shrimp Litopenaeus vannamei. Aquaculture Research, 36(14), 1444–1452.
Guerin, M., Huntley, M. E., & Olaizola, M. (2003). Haematococcus astaxanthin: Applications for human health and nutrition. Trends in Biotechnology, 21(5), 210–216.
Meunpol, O., Meejing, P., & Piyatiratitivorakul, S. (2005). Maturation diet based on astaxanthin supplementation in shrimp broodstock (Penaeus monodon). Aquaculture Research, 36(13), 1216–1225.
Niu, J., Tian, L. X., Liu, Y. J., Yang, H. J., Ye, C. X., Gao, W., & Mai, K. S. (2009). Effect of dietary astaxanthin on growth, survival, and stress tolerance of postlarval shrimp (Litopenaeus vannamei). Aquaculture Nutrition, 15(4), 282–290.
Pan, C. H., Chien, Y. H., & Hunter, B. (2011). The antioxidant defense system of shrimp is enhanced by dietary astaxanthin. Aquaculture, 315(3–4), 264–268.
Zhang, J., Sun, Z., Sun, P., Chen, T., & Chen, F. (2014). Microalgal astaxanthin: Research and industrial applications. Biotechnology Advances, 32(8), 1731–1743.
