Comprehensive Report: Wet-Aged Salmon Using King Son Constancy IFP Chilling Technology

Executive Summary

This report evaluates the application of King Son Constancy Chilling Technology for wet-aging salmon at (-1.7°C ± 0.3°C/28.94°F±0.54°F), above the initial freezing point, over 28 days. The analysis focuses on physicochemical, sensory, and microbiological safety attributes, consumer taste preferences, and dynamic pricing policies based on quality changes. Drawing from experimental data on King Son Constancy IFP Chilling Technology (adapted for -1.7°C) and U.S. online fresh salmon prices in June 2025, the report demonstrates that wet-aged salmon achieves peak quality at days 14–21, justifying premium pricing, and maintains good quality through day 28, offering extended shelf life and economic value. Dynamic pricing reflects quality variations, with farm-raised Atlantic salmon priced from $13.75–$17.50/lb. ($30.31–$38.58/kg) and wild-caught, premium King salmon from $38.50–$49.00/lb. ($84.88–$108.03/kg).

1. Introduction

King Son Constancy Chilling Technology preserves aquatic products at precise temperatures to extend shelf life and enhance quality. For wet-aged salmon, the IFP Chilling technology maintains a constant at (-1.7°C ± 0.3°C/28.94°F±0.54°F), above the initial freezing point (-2.2°C for salmon), to avoid protein denaturation while slowing microbial growth and chemical reactions. This report assesses the IFP Chilling technology’s impact on salmon quality over 28 days, using data from a related Shell-Superchilling process experiment (at -1.7°C ± 0.3°C) and U.S. market prices, to inform dynamic pricing and market positioning.

2. Quality Attributes of Wet-Aged Salmon

The quality of wet-aged salmon was evaluated based on physicochemical, sensory, and microbiological safety metrics, adapted from the King Son Constancy IFP Chilling experiment.
2.1 Physicochemical Characteristics

• pH: Initial pH ranged from 6.27–6.65, stabilizing at 6.38–6.60 over 28 days, indicating minimal acidity changes and sustained freshness.
• Sweetness: Peaked at days 14–21 (18.4–19.6), slightly declining to 18.2 by day 28, suggesting optimal flavor during mid-aging.
• Total Volatile Basic Nitrogen (TVB-N): King Son Constancy IFP chilling significantly reduces TVB-N, a spoilage indicator. At (-1.7°C ± 0.3°C/28.94°F±0.54°F), TVB-N accumulation is slower than at 4°C, likely maintaining first-grade freshness beyond 14 days.
• Lipid Oxidation: At (-1.7°C ± 0.3°C/28.94°F±0.54°F), lipid oxidation is minimized compared to standard refrigeration (4°C), preserving texture and flavor. The experiment showed King Son Constancy IFP Chilling reduced fat oxidation by 1.4–2 times compared to ice storage.

2.2 Sensory Characteristics

• Appearance: Salmon retained vibrant color and glossy muscle throughout 28 days, with no significant deterioration.
• Aroma: A “rich and charming” aroma peaked at days 14–21, slightly softening by day 28 but remaining pleasant.
• Texture: Elasticity was high initially, slightly decreasing by day 28, but muscle structure remained clear and firm.
• Flavor: Sous-vide cooked salmon (60°C, 2 hours) was juiciest and most flavorful at days 14–21, with a slight decline in sweetness by day 28.
• Sensory Score: Rated 9–10 at days 14–21, reflecting peak consumer appeal, and remained 9–10 by day 28, though slightly less intense.

2.3 Microbiological Safety
King Son Constancy Chilling at (-1.7°C ± 0.3°C/28.94°F±0.54°F) inhibits microbial growth, particularly cold-tolerant bacteria and pathogens like Vibrio parahaemolyticus and Salmonella. The experiment showed King Son Constancy IFP Chilling maintained first-grade freshness for shrimp up to 8 days (vs. 4 days under refrigeration). At (-1.7°C ± 0.3°C/28.94°F±0.54°F), microbial growth is slower than at 4°C, likely ensuring safety through 21–28 days with proper handling, reducing spoilage risks and enhancing consumer trust.  

• Microbial Safety: SGS tests showed acceptable Total Viable Count (TVC):
  • Day 0: 6.4 × 10^3 CFU/g
  • Day 28: 7.5 × 10^5 CFU/g

2.4 Consumer Taste Preference

• Day 7: Fresh, mildly enhanced flavor, suitable for standard fresh salmon dishes.
• Days 14–21: Optimal flavor, juiciness, and aroma, ideal for gourmet applications (e.g., sushi, fine dining).
• Day 28: Good quality with slightly reduced elasticity and flavor intensity, appealing to value-conscious consumers or processed products (e.g., smoked salmon).

2.5 Changes of Free Amino Acids during Storage at -1.7°C

3. Dynamic Pricing Policies

Dynamic pricing reflects quality variations and market positioning, using U.S. online fresh salmon prices (June 2025) as a baseline:

• Atlantic Salmon: $12.50/lb. ($27.56/kg), farm raised.
• King Salmon: $35.00/lb. ($77.16/kg), wild-caught, premium.

3.1 Pricing Methodology
Prices were adjusted with premium multipliers based on quality:

• Day 7: +10% for freshness and chilling technology.
• Day 14: +40% for peak sensory quality.
• Day 21: +35% for near-peak quality.
• Day 28: +20% for extended shelf life and good quality. Conversion: 1 lb. = 0.453592 kg; $/kg = $/lb. ÷ 0.453592.

3.2 Pricing Table

Day	Atlantic Salmon ($/lb.)	Atlantic Salmon ($/kg)	King Salmon ($/lb.)	King Salmon ($/kg)	Quality Notes
7	13.75	30.31	38.50	84.88	Fresh, good quality, slightly enhanced flavor, high elasticity, microbiologically safe.
14	17.50	38.58	49.00	108.03	Salmon’s mid-section flesh: preserved and stored at -1.7℃ degrees for 21 days, pH value 6.38, sweetness 18.4. Sensory evaluation score 9 - 10 The color is bright, the muscles have a sheen, the fish meat has a rich aroma, the fish meat still has elasticity, and the texture is clear. Sous-vide at 60°C for 2 hours - the fish has an enticing and rich aroma, is juicy and flavorful with a hint of sweetness.
21	16.88	37.21	47.25	104.17	Mid-section (stored at -1.7°C): pH 6.38, Sweetness 18.4, Sensory Score 9-10. Bright color, shiny muscle, rich aroma, slightly declined elasticity, clear texture structure. Sous-vide cooked salmon was rich in aroma, juicy, and delicious, though sweetness was slightly declined.
28	15.00	33.07	42.00	92.59	Mid-section (stored at -1.7°C): pH 6.39, Sweetness 18.2, Sensory Score 9-10. Vibrant color, glossy flesh, no noticeable difference from day 21. Rich aroma, reduced elasticity, clear texture structure. Sensory evaluation of flavor and sweetness was slightly lower than the peak on day 21. Sous-vide cooked salmon had a sensory evaluation slightly below the day 21 peak.

4. Economic Value

The application of King Son Constancy Chilling Technology offers significant economic benefits:

• Extended Shelf Life: 28 days vs. 4–8 days for standard refrigeration, reducing waste and enabling broader distribution.
• Premium Market Positioning: Days 14–21 command 30–40% price premiums, targeting gourmet markets and high-end restaurants.
• Microbiological Safety: Low microbial growth minimizes recall risks and enhances consumer confidence.
• Market Differentiation: Wet-aged salmon can be marketed as a premium, “aged-like-fine-wine” product, appealing to culinary enthusiasts and justifying higher margins.

5. Financial Savings Compared to Traditional Display Cases

Notes

• Energy savings are calculated based on an electricity cost of $0.15/kWh.
• Salmon waste savings assume a raw material cost of $10/kg.
• Economic loss reflects the cost of wasted products and operational inefficiencies in traditional methods.
• Water wastage savings are based on an estimated cost of $0.009/liter.
• CO2 emissions savings use a carbon pricing estimate of $0.356/kg CO2e, aligned with 2025 market data.
• Total annual savings ($32,682.56) incorporate energy, waste, economic, water, and CO2e savings, as outlined in the proposal.

6. Conclusion

King Son Constancy Chilling Technology at 0°C/32°F enables wet-aged salmon to maintain high quality over 28 days, with peak sensory attributes at days 14–21. Dynamic pricing aligns with quality changes, offering premiums of 10–40% over baseline prices, with Atlantic salmon ranging from $13.75–$17.50/lb. ($30.31–$38.58/kg) and King salmon from $38.50–$49.00/lb. ($84.88–$108.03/kg). The King Son Constancy IFP Chilling technology’s ability to extend shelf life, enhance flavor, and ensure safety positions wet-aged salmon as a high-value product for premium markets, delivering economic benefits through reduced waste and differentiated positioning.

7. Recommendations

• Target Days 14–21: Market as a gourmet product for high-end restaurants and retailers, emphasizing peak flavor and aroma.
• Leverage Day 28: Position as a value-premium option for processed products or budget-conscious consumers.
• Marketing Strategy: Highlight the “wet-aged” process, comparing it to aged beef, to justify premiums and educate consumers.
• Further Research: Conduct consumer taste tests at (-1.7°C ± 0.3°C/28.94°F±0.54°F) to validate preferences and refine pricing.

Source: Adapted from King Son IFP Chilling experiment data and U.S. online salmon prices (June 2025).

8. Experimental Validation: Salmon Shell Superchilling

An experiment conducted from March 18 to April 15, 2024, tested King Son IFP Chilling on salmon fillets using an IRINOX Blast Chiller and King Son Convertible IFP Seafood Sub Chiller.

8.1 Methodology

• Sample: Fresh salmon fillets (imported from Norway to Taiwan).
• Initial Freezing Point: -2.2°C.
• Processing: Fillets were Shell-Superchilled process at -35°C for 5 minutes to form a surface ice content of less than 30%, vacuum-packed, and stored at -1.7°C ± 0.3°C with 90% ± 5% humidity for 28 days.
• Measurements: pH, sweetness, sensory evaluation (color, texture, aroma), and sous-vide cooking quality were assessed weekly.

8.2 Results

• Day 1 (March 18):
  • Tail: pH 6.27, Sweetness 18.0.
  • Mid-section: pH 6.65.
• Day 7 (March 25):
  • Tail (stored at -0.8°C): pH 6.44, Sweetness 10.8, Sensory Score 7. Bright color, firm texture, reduced elasticity. Sous-vide cooked salmon was fresh flavor.
  • Mid-section (stored at -1.7°C): pH 6.6, Sweetness 19.6, Sensory Score 9-10. Vibrant color, elastic texture, rich aroma. Sous-vide cooked salmon was juicy and aromatic.
• Day 14 (April 1):
  • Salmon’s mid-section flesh: preserved and stored at -1.7℃ degrees for 21 days, pH value 6.38, sweetness 18.4.
  • Sensory evaluation score 9 - 10
  • The color is bright, the muscle has a sheen, the fish meat has a rich aroma, the fish meat still has elasticity, and the texture is clear.
  • Sous-vide at 60°C for 2 hours - the fish has an enticing and rich aroma, is juicy and flavorful with a hint of sweetness.
• Day 21 (April 8):
  • Mid-section (stored at -1.7°C): pH 6.38, Sweetness 18.4, Sensory Score 9-10. Bright color, shiny muscle, rich aroma, slightly declined elasticity, clear texture structure. Sous-vide cooked salmon was rich in aroma, juicy, and delicious, though sweetness was slightly declined.
• Day 28 (April 15):
  • Mid-section (stored at -1.7°C): pH 6.39, Sweetness 18.2, Sensory Score 9-10. Vibrant color, glossy flesh, no noticeable difference from day 21. Rich aroma, reduced elasticity, clear texture structure. Sensory evaluation of flavor and sweetness was slightly lower than the peak on day 21. Sous-vide cooked salmon had a sensory evaluation slightly below the day 21 peak.

8.3 Microbiological Safety
King Son Constancy IFP Chilling at -1.7°C inhibits microbial growth, particularly cold-tolerant bacteria and pathogens like Vibrio parahaemolyticus and Salmonella. The IFP Chilling technology maintains first-grade freshness for shrimp up to 8 days, compared to 4 days under refrigeration. At -1.7°C, microbial growth is slower than at 4°C, likely ensuring safety through 21-28 days with proper handling, reducing spoilage risks and enhancing consumer trust.

• SGS Microbiological Tests:
  • Day 0: Total Viable Count (TVC) of 6.4 × 10³ CFU/g.
  • Day 28: TVC of 7.5 × 10⁵ CFU/g, indicating acceptable microbial levels for extended storage.

8.4 Findings
The mid-section stored at -1.7°C exhibited superior quality retention compared to the tail at -0.8°C, which was insufficient for long-term shelf-life extension. IFP Chilling at -1.7°C preserved sensory attributes and extended shelf life effectively, with acceptable microbial levels after 28 days.
 
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Comprehensive Report: Wet-Aged Salmon Using King Son Constancy IFP Chilling Technology