Cost & Yield
How to Improve Fish Yield: 5 Ways to Cut Food Costs for Restaurants
To improve food costs for fish dishes, it is crucial not only to check purchase prices, but also to understand fish "yield."
Even when purchasing fish at the same price, if a large portion is discarded during prep and portioning, the amount you can actually use for cooking decreases.
For example, if you purchase 5 kg of fish and end up with 2.5 kg of usable meat for cooking, the yield is 50%.
The key to improving fish yield is reducing processing loss and procuring fish in sizes and processing stages best suited to your menu.
In this article, we explain how to calculate fish yield and introduce 5 practical improvement methods restaurants can implement right away.
What Is Fish Yield? Yield Calculation Explained
Yield is the percentage of usable fish portion relative to the total purchased fish weight.
Yield (%) = Usable Weight ÷ Purchased Weight × 100
For example, if you purchase 5 kg of whole fish and obtain 2.5 kg of usable meat after prep, the yield is 50%.
Yield varies depending on the fish species, size, and processing method. Furthermore, the criteria for usable parts differ between bone-in grilled dishes and sashimi, so it is important to make comparisons based on the same processing condition and intended use.
3 Causes of Poor Fish Yield
1. Discarding More Meat Than Necessary During Prep
Filleting, deboning, and skinning can result in varying amounts of discarded meat depending on processing techniques.
When prep methods vary by kitchen staff, yield tends to become inconsistent.
2. Inconsistent Fish Sizes
Even within the same species, varying sizes affect portioning techniques and prep time.
When aiming for fixed-weight portions, uneven fish sizes can lead to increased offcuts and trimmings.
3. Ordering More Fish Than Needed
When procurement exceeds usage, unused fish can end up going to waste.
Although this is distinct from processing yield, it directly leads to food waste for the restaurant overall. It is important to track processing loss and inventory waste separately.
5 Ways to Improve Fish Yield
1. Record Yield by Fish Species
The first step to take is recording the purchased weight and the usable weight obtained.
| Recorded Item | Example Entry |
|---|---|
| Fish Species | Red sea bream |
| Purchased Weight | 5 kg |
| Usable Weight | 2.5 kg |
| Yield | 50% |
| Processing Details | Three-piece filleting, deboning |
*Values are hypothetical figures to illustrate the calculation method and do not represent the standard yield for red sea bream.
Comparing multiple batches helps you confirm variations caused by fish size or processing technique. Continuing to log these numbers makes it easier to pinpoint cost fluctuation factors that cannot be seen from purchase prices alone.
2. Standardise Prep Methods
Share techniques for filleting, deboning, and skinning across your team to set consistent finishing standards. Reducing variation between staff members helps stabilise yield.
For example, you can clearly define the required outcome for each dish, such as cut thickness and the extent of deboning. However, you should never cut corners on essential deboning or sanitation just to boost yield numbers.
3. Procure in Sizes and Specifications Suited to Your Dishes
If the menu use is already decided, consider specifying the size and cut specifications when ordering. For fixed-weight grilled dishes, using fish of uniform size can minimise trimmings during portioning. Choose specifications that are easy to work with in the kitchen, not just easy to buy.
4. Utilise Pre-Processed Fish
Purchasing pre-filleted or pre-portioned fish reduces the prep work required in-house. While this can eliminate prep loss and save kitchen prep time, processing fees may be reflected in the purchase price.
When making comparisons, consider the following points:
- Purchase price
- Usable weight for cooking
- Kitchen prep time required
- Waste generated during processing
It is crucial to evaluate not just the price per kilogram, but the usable weight and overall processing cost combined.
Related Article Whole Fish vs. Pre-Processed Fish: Which Is More Profitable? A Comparison of Purchase Price, Yield, Labour, and Waste
5. Decide on Ways to Utilise Offcuts and Trimmings
Trimmings generated during portioning can often be repurposed for dishes like fish meatballs (tsumire) or cooked simmered dishes, provided quality and food safety standards are maintained. However, not all trimmings can be reused.
Check storage conditions and shelf-life, and only use trimmings that can be handled safely. Recording the weight of trimmings used in dishes also makes it easier to monitor how effectively your ingredients are utilised overall.
How Does Improving Yield Impact Fish Food Costs?
Let's compare purchasing 5 kg of fish for 10,000 yen.
| Item | 50% Yield | 55% Yield |
|---|---|---|
| Purchased Weight | 5 kg | 5 kg |
| Purchase Price | 10,000 yen | 10,000 yen |
| Usable Weight | 2.5 kg | 2.75 kg |
| Cost of Usable Portion | 4,000 yen/kg | Approx. 3,636 yen/kg |
*Hypothetical example for comparison purposes. Processing and labour costs are not included.
Improving the yield from 50% to 55% yields an additional 250 g of usable meat, reducing the cost per kilogram by approximately 364 yen. This estimate illustrates the effect of a 5-percentage-point yield increase.
However, if the time spent prepping increases substantially to achieve this improvement, it does not necessarily result in higher profits. Evaluate yield alongside processing costs.
Related Article How to Accurately Manage Fish Costs: From Price per Kilogram to Cost per Plate
Don't Choose Suppliers Based on Yield Alone
While yield is a useful metric for cost management, a higher number does not automatically mean a better purchase. Pre-processed fish offers high in-house yield, but the unit purchase price may be higher.
Conversely, whole fish may have a lower purchase price, but requires more prep time and produces more waste. Take a comprehensive look at quality, usable weight, price, prep time, and waste volume.
Related Article 7 Ways to Streamline Restaurant Seafood Procurement | Key Points to Review Food Cost, Inventory, and Prep
Fish Yield Improvement Checklist
- Recording yield by fish species, size, and processing cut
- Standardising prep methods and finished quality standards
- Procuring in sizes and processing specifications tailored to your dishes
- Comparing net costs between whole fish and pre-processed fish
- Establishing clear uses for safely reusable offcuts and trimmings
- Managing processing loss and inventory waste separately
Review any unchecked items to identify areas for improvement.
Frequently Asked Questions (FAQ)
Q. What is the ideal fish yield percentage?
There is no single ideal number, as it varies by fish species, size, and processing method. Start by recording your own restaurant's data and comparing results under consistent conditions.
Q. Does pre-processed fish have a better yield?
Because less needs to be removed in the restaurant kitchen, the usable proportion of delivered weight tends to be higher. However, be sure to also check the purchase price, which includes processing costs.
Q. Does improving yield lower the food cost percentage?
If the usable weight increases for the same purchase price, the cost per unit weight of the usable portion decreases. However, overall food cost percentage also depends on menu selling prices and other ingredient costs.
Summary | Improving Fish Yield Starts with Reviewing Procurement and Prep
To improve fish yield, it is essential to track purchased versus usable weight and review your prep techniques and fish specifications. By combining standardised prep, uniform sizing, and the strategic use of pre-processed fish, choose methods that reduce costs while taking quality and labour into account.
Making Seafood Procurement Simpler.
At FINE ATLAS, we are building a new procurement system that seamlessly connects catch at source, processing, rapid freezing, refrigerated transport, thawing, prep, and delivery.
We aim to deliver fish in the formats chefs need most—from whole fish to fillets and portion cuts.
If you have concerns about fish sizes, processing specifications, or kitchen prep workload, please feel free to consult FINE ATLAS.