Scientific Feeding for Quality and Efficiency Improvement — Standardized Feed Management in Aquaculture

As a core link in aquaculture, feed feeding directly determines the growth rate, survival rate and finished product quality of farmed fish, shrimp, crab and other aquatic species. Meanwhile, it profoundly affects pond water quality, breeding costs and economic benefits. With the gradual transformation of the aquaculture industry toward standardization, refinement and ecologicalization, abandoning the traditional extensive feeding mode and implementing scientific and standardized feed feeding measures has become the key to reducing feed loss, minimizing disease occurrence and improving breeding profits. The core goal of scientific feeding is to achieve "minimum waste, maximum absorption and optimal water quality", and to build an efficient and green feeding system through full-process management of feed selection, feeding methods, dynamic adjustment and supporting maintenance.

Accurate selection of suitable feeds is the primary prerequisite for scientific feeding. Aquatic species at different growth stages have significantly different nutritional requirements, and universal feeds should not be used blindly. In terms of species characteristics, carnivorous fish such as large yellow croaker and sea bass have a high demand for animal protein and require special feeds with high proportions of fish meal and fish oil. Omnivorous fish including grass carp and tilapia can be fed with feeds dominated by plant protein. For crustaceans such as whiteleg shrimp and mud crab, special feeds rich in calcium, phosphorus and other minerals are required to meet their growth needs during molting. In terms of growth stages, fry have weak physical conditions and poor digestion, so fine, digestible and nutritionally balanced crumbled or micro-particle feeds are needed to ensure ingestion and absorption. Fish in the growing stage grow rapidly and can be fed with conventional compound feeds with balanced supplements of protein, vitamins and trace elements. During the fattening stage, the feed formula can be appropriately adjusted by optimizing the proportion of fat and carbohydrates to accelerate weight gain. In addition, qualified feed standards must be strictly followed in breeding. Moldy, damp, expired and deteriorated feeds are prohibited to prevent harmful substances from causing liver, gallbladder and gastrointestinal diseases in aquatic organisms, thus safeguarding their health from the source.

Strictly adhering to scientific feeding guidelines and standardizing daily feeding operations are core measures to improve feed conversion efficiency. Aquaculture feeding must follow the standardized principle of "four fixations": fixed time, fixed location, fixed quality and fixed quantity. Feeding at fixed times should conform to the feeding habits of aquatic organisms. Most freshwater fish are suitable for feeding at appropriate daytime temperatures, with 3 to 4 uniform feeding times daily to form regular feeding habits. The feeding frequency can be reduced in low-temperature seasons and appropriately increased in the high-temperature growing season. Feeding at fixed locations avoids pond dead corners and silt accumulation areas. Optimal positions with fresh water, appropriate water depth and sufficient light allow aquatic organisms to gather for feeding, reduce feed scattering and waste, and facilitate feeding observation and residual bait cleaning. The fixed-quantity feeding principle adheres to the "eighty percent full" standard. The daily feeding amount, generally 2.5% to 3% of the total weight of aquatic products, is accurately calculated based on breeding density, aquatic specifications and total biomass. Each feeding session ends when 80% to 85% of aquatic organisms finish feeding and disperse, avoiding water quality deterioration caused by excessive residual bait or stunted growth due to insufficient feeding.

Dynamic adjustment of feeding schemes according to environmental changes is a key technique for stable and increased production. The feeding activity and digestive efficiency of aquatic organisms are greatly affected by water temperature, weather, water quality, dissolved oxygen and other environmental factors, making fixed feeding modes inapplicable to variable breeding conditions. Water temperature serves as a critical factor: aquatic organisms have vigorous metabolism and feeding ability at 15℃ to 28℃ with normal full feeding. When the water temperature is below 15℃ or above 32℃, their activity and digestive function decline, requiring a sharp reduction in feeding amount, and feeding can be suspended in extreme low-temperature weather. Feeding strategies should adapt to weather changes: normal feeding is applicable on clear and windless days with sufficient dissolved oxygen. Feeding amount should be reduced by 30% to 50% on overcast, sultry and foggy days with insufficient dissolved oxygen. Feeding needs to be suspended for 1 to 2 times after rainstorms until water quality stabilizes, due to turbid water and disturbed microbial flora. Regular water quality monitoring is essential. When ammonia nitrogen and nitrite exceed the standard or water transparency decreases and water quality deteriorates, the feeding amount should be reduced timely to prevent residual bait from aggravating water pollution and triggering pond flooding and disease outbreaks.

Optimizing supporting feeding management is a long-term guarantee for quality improvement and cost reduction. On the one hand, natural bait and artificial feed can be scientifically combined. In the fry breeding stage, natural baits such as boiled soybean milk and plankton can be used to make up for nutritional deficiencies in artificial feed, improve fry survival rate, reduce breeding costs and realize ecological feeding. On the other hand, compliant feed additives can be properly applied. Enzyme preparations such as protease and lipase can be supplemented moderately to enhance the digestion and absorption of feed nutrients. Liver and gallbladder protecting additives and multivitamins can improve metabolic functions, reduce common diseases such as hepatobiliary syndrome and enhance stress resistance. In addition, standardized feed storage management is required. Feeds should be stored in dry, ventilated and shaded warehouses with moisture-proof, rodent-proof and insect-proof measures to prevent oxidation, mildew and nutritional loss. Feeds should be taken on demand to avoid long-term stacking and waste. Furthermore, pond patrols are required after feeding to salvage floating residual bait and clean sedimentary bait at the pond bottom. Aerators should be operated regularly to increase dissolved oxygen, promote residual bait decomposition and maintain pond ecological balance.

In conclusion, feed feeding in aquaculture is not a simple feeding operation, but a refined, dynamic and systematic management system. Breeders should abandon extensive breeding concepts and implement standardized measures including optimal feed selection, standardized feeding, dynamic adjustment and supporting management to control every feeding detail precisely. Scientific feeding can effectively improve feed utilization rate, reduce breeding costs and accelerate aquatic growth. It can also protect pond water ecological environment and reduce disease incidence, helping aquaculture achieve high yield, high quality, high efficiency and ecological sustainability, and promoting the standardized and green development of the aquaculture industry.