Microbial Oil Coating for Quick-Sinking Fish Feed Pellets
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Solution Overview
Problem
Fish feed pellets with diameters less than 4 mm struggle to sink in cold water due to low intrinsic weight and high surface tension, leading to economic and environmental issues as they are easily displaced by waves, especially in open seawater environments.
Innovation Solution
Coating fish feed pellets with a microbial oil, preferably derived from algae, to increase their sinking speed, with concentrations ranging from at least 10% to 100% microbial oil in the coating, and optionally combining with vegetable or fish oil to modulate sinking speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fish feed pellets are made with high protein content to meet nutritional requirements, then the nutritional value is improved, but the pellets become prone to caking and hardening during storage and transport
Solution Approach 1:
A coating composition containing gelatin and/or chitosan is applied as an intermediary layer on the fish feed pellets. This coating acts as a protective barrier that prevents direct contact between the high-protein pellet surface and environmental moisture, thereby preventing caking and hardening while maintaining the high protein content and nutritional value of the pellets.
2Quantity of substance
If microbial oil is loaded into fish feed pellets to enhance nutritional value and fish growth, then the nutritional benefit is improved, but the oil may cause caking and hardening of the pellets
Solution Approach 1:
The gelatin and/or chitosan coating serves as a protective intermediary layer that encapsulates the microbial oil within the pellets. This coating prevents the oil from directly contacting the pellet matrix and causing caking, while still allowing the oil to provide its nutritional benefits to the fish.
Solution Approach 2:
A flexible coating film made of gelatin and/or chitosan is applied to the pellet surface. This thin film acts as a protective shell that prevents moisture absorption and caking caused by the microbial oil, while maintaining the oil's nutritional properties and the overall stability of the pellet during storage and transport.
3Duration of action of stationary object
If fish feed pellets are stored for extended periods to ensure supply availability, then the supply stability is improved, but the pellets are prone to caking and hardening
Solution Approach 1:
The gelatin and/or chitosan coating acts as a protective intermediary layer that prevents moisture penetration into the pellets during extended storage periods. This coating maintains the physical and chemical stability of the pellets, preventing caking and hardening even after prolonged storage, thereby ensuring supply availability without compromising pellet quality.
Solution Approach 2:
A protective flexible coating film made of gelatin and/or chitosan is applied to the pellet surface to act as a barrier during extended storage. This film prevents moisture absorption and maintains pellet stability over time, allowing for extended storage periods while preventing caking and hardening that would otherwise occur.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The microbial oil significantly enhances the sinking speed of fish feed pellets, ensuring they reach fish efficiently without being displaced by waves, thereby reducing economic losses and environmental impact.
Implementation Method 1
Fish feed pellets made from fish meal and/or other animal protein sources and containing microbial oil are prone to caking and hardening during storage and transport. The caking and hardening is caused by moisture absorption by the pellets
Implementation Method 2
A coating composition containing gelatin and/or chitosan may be used to coat the fish feed pellets
Implementation Method 3
Fish feed pellets made from fish meal and/or other animal protein sources and containing microbial oil
Data Source
AI summary
The present invention relates to a quick-sinking fish feed in the form of pellets. It has been found that pellets, the diameter of which is < 4 mm, have difficulty in sinking, especially in the cold time of the year when the density of water is at its maximum. The reason why the feed does not sink is its low intrinsic weight and the too high surface tension. If the fish does not have time to catch the feed, the pellets will be moved by the waves of the sea through the meshes out into the free water. This problem can be solved by loading or coating the fish feed pellets with an oil comprising at least 10% microbial oil.