Improving the feasibility of aquaculture feed by using microalgae

Area of Science:

• Aquaculture
• Marine Biology
• Biotechnology

Background:

• The aquaculture industry's rapid growth necessitates efficient protein production, driving demand for high-quality fish feed.
• Conventional feed ingredients like fish meal (FM) and fish oil (FO) face challenges in availability, nutritional value, and cost, impacting aquaculture production expenses (40-75%).
• Microalgae, as primary aquatic producers, are versatile and rich in essential nutrients like proteins, lipids (PUFA), and bioactive compounds, positioning them as a viable alternative feed ingredient.

Purpose of the Study:

• To review the potential applications of microalgae in aquaculture feed.
• To evaluate the nutritional value and mode of application of microalgae as a replacement for conventional feed ingredients.
• To discuss integrated systems like algae cultivation in aquaculture wastewater and aquaponics.

Main Methods:

• Literature review of studies on microalgae as aquaculture feed ingredients.
• Analysis of nutritional composition of various microalgal biomass forms (live, whole, lipid-extracted algae - LEA).
• Examination of research on microalgae's impact on fish growth, physiology, and nutritional quality.

Main Results:

• Microalgae provide essential amino acids, polyunsaturated fatty acids (PUFA), and other beneficial compounds suitable for fish feed.
• Studies show promising results for live algae, whole algae, and lipid-extracted algae (LEA) in improving fish growth and physiological activity.
• Microalgae can potentially replace conventional ingredients, offering a more sustainable and cost-effective solution compared to plant-based alternatives.

Conclusions:

• Microalgae represent a significant and sustainable alternative ingredient for the aquafeed industry.
• Further research into integrated cultivation systems and optimizing microalgal biomass for feed is crucial.
• The use of microalgae in aquaculture feed holds promise for enhancing fish nutrition, reducing production costs, and promoting environmental sustainability.