Salmon Egg Rearing via Seasonal Light and Temperature Control
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Solution Overview
Problem
Current salmon egg production methods face challenges in achieving high-quality, viable eggs on a continuous basis across all seasons, as the interaction of photocycle and temperature on maturation remains poorly understood, and existing methods struggle to optimize egg development and viability.
Innovation Solution
A process involving the adjustment of light exposure and temperature to simulate a winter-summer period, with a specific Accumulated Thermal Unit (ATU) range, to optimize salmon egg production, ensuring large and viable eggs by controlling light and temperature conditions throughout the life-cycle stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If continuous light exposure is used to advance ovulation time, then egg production timing is improved, but egg survival rate deteriorates
Solution Approach 1:
The patent applies periodic light exposure (photoperiods) instead of continuous light to trigger maturation and ovulation in salmon. By using natural day-length variations and seasonal light cycles, the method advances ovulation timing while avoiding the detrimental effects of continuous light exposure on egg survival. The periodic light regime mimics natural conditions and optimizes both timing and viability.
Solution Approach 2:
The patent changes light exposure parameters (duration, intensity, timing) to optimize egg production. Specifically, it uses controlled photoperiods with specific day lengths (e.g., 16-20 hours of light during certain periods) rather than continuous exposure, and adjusts temperature parameters in coordination with light to achieve optimal maturation conditions without compromising egg survival.
2Speed
If elevated temperature is used to trigger maturation, then maturation speed is improved, but egg quality deteriorates
Solution Approach 1:
The patent optimizes temperature parameters within a specific range (8-15°C) rather than using elevated temperatures. This controlled temperature regime, combined with specific photoperiods, achieves maturation at appropriate speeds while maintaining high egg quality and survival rates. The method rejects temperature elevation as it causes detrimental effects on egg development.
Solution Approach 2:
The patent uses seasonal temperature variations and periodic temperature adjustments rather than continuously elevated temperatures. By mimicking natural temperature cycles and using controlled temperature regimes that vary throughout the rearing period, the method achieves maturation while preserving egg quality.
3Manufacturing precision
If extended rearing period is used to improve egg size, then egg quality is improved, but production efficiency deteriorates
Solution Approach 1:
The patent uses optimized light and temperature parameters to achieve optimal egg size within a controlled rearing period. By adjusting photoperiod duration and intensity, along with temperature regimes, the method accelerates maturation while producing large, high-quality eggs, thereby improving both egg size and production efficiency simultaneously.
Solution Approach 2:
The patent applies preliminary light and temperature treatments during specific life-cycle stages to prepare the salmon for optimal egg production. By implementing controlled photoperiods and temperature regimes during juvenile and pre-spawning stages, the method ensures that fish reach optimal size and condition for egg production, achieving large eggs without excessively extended rearing periods.
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AI summary
A process for harvesting fish eggs is provided, in particular fish eggs from Salmon. The process comprises rearing sexually immature salmon in an aquatic environment in stages during which at least the light exposure and time span is adjusted. The rearing includes at least a winter-summer period that comprises a winter life-cycle stage, within which the broodstock is exposed to light that simulates winter light exposure, and a subsequent summer life-cycle stage, within which the broodstock is exposed to light that simulates summer light exposure, wherein the total Accumulated Thermal Unit (ATU) during the winter-summer period is no more than 5000. The inventions also provides salmon eggs that are produced by the disclosed process.