Fish Feed Outer Layer Gel Breaking Stress
Solution Overview
Problem
Tuna species in fish farming have a strong preference for raw bait over artificial feed, making it difficult to switch to artificial feed due to low feed intake and efficiency, particularly for highly carnivorous fish like Pacific bluefin and Northern bluefin tuna.
Innovation Solution
A feed with specific physical properties, including a breaking stress of 5×10^4 to 1×10^6 N/m2, cohesiveness of 0.4 to 1.0%, and breaking strain of 30 to 80%, combined with a heat-induced gel outer layer and a nutrient-rich inner layer containing fish meal and fish oil, is developed to mimic the preferred characteristics of raw bait.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If raw bait is used as feed, then feed intake and preference by tuna species is high, but stability of supply and product quality deteriorates due to natural resource variability
Solution Approach 1:
The invention changes the physical parameters of artificial feed to match those of raw bait. Specifically, it controls breaking stress (5×10^4 to 5×10^5 N/m^2), cohesiveness (0.4 to 0.6), and breaking strain (30 to 60%) to create a feed that mimics the mouthfeel and physical properties of raw bait, thereby improving feed intake while maintaining supply stability
Solution Approach 2:
The invention uses composite materials combining protein ingredients (40-70% including fish meal, surimi, or krill), fat ingredients (10-40% including fish oil), and starch ingredients (10-40%) to create an artificial feed that replicates the nutritional and physical characteristics of raw bait. This composite approach enables both high feed intake and stable supply
2Stability of the object's composition
If artificial feed is used, then stability of feed supply and shelf life is improved, but feed intake and preference by highly carnivorous fish deteriorates
Solution Approach 1:
The invention adjusts key physical parameters including breaking stress (5×10^4 to 5×10^5 N/m^2), cohesiveness (0.4 to 0.6), and breaking strain (30 to 60%) to match the preferred physical properties of raw bait. This enables artificial feed to achieve both supply stability and high feed intake by tuna species
Solution Approach 2:
The invention applies different ingredient compositions and physical properties to different aspects of the feed. The feed contains high protein (40-70%) and fat (10-40%) content in specific proportions, with controlled moisture (20-40%) and oil content (5-20%) to create localized quality zones that mimic raw bait characteristics while maintaining overall supply stability
3Quantity of substance
If high protein and fat content is incorporated to match raw bait nutrition, then nutritional value is improved, but manufacturing complexity and storage requirements increase
Solution Approach 1:
The invention optimizes the balance between protein (40-70%), fat (10-40%), and starch (10-40%) ingredients while controlling moisture (20-40%) and oil content (5-20%). This parameter optimization achieves high nutritional value with manageable manufacturing complexity by avoiding excessive moisture that would require specialized processing equipment
Solution Approach 2:
The invention concentrates high protein and fat content in specific ingredient formulations rather than uniformly distributing all nutrients. This localized quality approach allows selective incorporation of nutritional components while simplifying the overall manufacturing process and reducing storage complexity
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 feed achieves high feed intake and efficiency similar to raw bait, with improved stability and shelf life, allowing for successful farming of tuna species using artificial feed.
Implementation Method 1
a feed for fish farming including an outer layer and an inner layer (filling), characterized in that a composition constituting the outer layer has a breaking stress of 5×10^4 to 1×10^6 N/m2, an cohesiveness (30%) of 0.4 to 1.0 and a breaking strain of 30 to 80%
Data Source
AI summary
This invention provides a feed for fish farming which is excellent in terms of stability of feed supply and feed shelf life and which has excellent feed intake and feed efficiency.The feed for fish farming has an outer layer and an inner layer, characterized in that a composition constituting the outer layer has a breaking stress of 5×104 to 1×106 N/m2, a cohesiveness (30%) of 0.4 to 1.0, and a breaking strain of 30 to 80%. The feed for fish farming is characterized by having an outer layer constructed from a heat-induced gel which comprises a protein and/or a starch, and an inner layer comprising a composition which contains nutrient ingredients having fish meal and an oil as essential ingredients.