Floating fish feed pellets vs sinking fish feed pellet

In aquaculture practice, the physical properties and nutritional ratio of feed pellet have a decisive influence on fish feeding rate, digestion and absorption rate, and economic benefits of aquaculture. Faced with the two mainstream products of floating feed and sinking feed on the market, farmers often need to make scientific choices based on fish habits, water quality conditions and other factors. This article will systematically analyze the differences in the characteristics of the two to help you find the most suitable feeding plan.

The core role of fish feed pellet

As the core nutrient carrier of aquaculture, fish feed pellet are mainly produced by puffing or compression technology. From a nutritional perspective, this type of product requires a precise ratio of protein (20-50%), fat (5-20%), carbohydrates (10-30%) and micronutrients.

The current industry standard requires that high-quality feed must simultaneously achieve three major technical indicators: improve palatability through particle size and texture control, use enzymatic technology to improve protein digestibility (up to 85% or more), and achieve controllable floating and sinking characteristics through density adjustment. It is worth noting that the design of feed formula also needs to take into account the control of nitrogen and phosphorus emissions, which has important practical significance for maintaining the ecological balance of aquaculture water bodies.

Main types of fish feed

Classification by form

Powdered feed, pellet feed (including crushed feed), micro-particle feed

Classification by function

Growing feed, seedling feed, functional feed (such as color enhancer)

Classification by floating and sinking characteristics

Floating fish feed pellet: density is less than water, can float on the water surface

Sinking fish feed pellets: density is greater than water, sink quickly

Slow-sinking feed: between the two

Typical characteristics of floating and sinking feed

Advantages of floating fish feed pellet

Easy to observe the feeding situation of fish and reduce residual bait

Puffing process makes starch gelatinized and easier to digest

Suitable for upper fish such as koi and tilapia

Characteristics of sinking fish feed pellet

Meet the feeding habits of bottom fish (such as crucian carp and catfish)

High temperature pressing process retains more heat-sensitive nutrients

Nutritional density per unit volume is usually higher

How to choose a better solution

Choose according to fish species

Floating feed is preferred for mid- and upper-layer fish (e.g. grass carp can increase the efficiency of feeding on floating feed on the water surface by 30%)

Benthic fish should use sinking feed to avoid nutrient waste

Factors affecting water quality

Floating feed is suitable for high dissolved oxygen water

Sinking feed is recommended to reduce oxidation loss in turbid waters

Economic benefit considerations

Floating feed has high unit price but low feed coefficient (about 1.2-1.5)

Sinking feed has low price but may have 10-15% bottom residue

Professional advice

Modern farms often adopt the “floating and sinking combination” mode, such as feeding floating fish feed pellet in the morning and evening for easy observation, and supplementing sinking feed at night to meet all-weather nutritional needs. Regularly testing fish growth curves and water quality parameters can maximize feed benefits.