News features and technical articles about the evolution of aquaculture, one of the world’s fastest growing industries.

Consider feed quality, not just cost

Scott Snyder, Ph.D. Thomas R. Zeigler, Ph.D.

Consider feed as the vehicle that carries your fish to the finish line

feed quality
The use of high-quality feed can offer many benefits to a farm’s bottom line.

Farm managers and biologists rely on many metrics to assess animal growth performance and farm productivity. These include growth rate, feed conversion, muscle yield and viscera weight. These metrics measure the growth efficiency of the animals being reared. Measurements of feed use, electricity, fuel, labor, taxes and other expenses help determine the total cost of production.

All of these measurements should be used in making management decisions based on controlling costs. However, they should not be the primary factors in making feed purchase decisions. Feeding decisions based strictly on cost analysis can cause farms to purchase inexpensive, low-quality feed that cannot deliver optimum growth performance.

Growth cycles

Aquaculture growth has averaged 8.5 percent yearly for decades. When we look at this growth relative to advances in technology, we see the growth was not linear, but occurred as a series of technology jumps, each followed by a period of much slower growth until the next big breakthrough occurred. The lulls in growth were periods of diminishing returns during which the previous technology was being fine tuned and the next breakthrough was under development.

Aquafeed technology is currently passing through one of these periods of diminishing returns, and the market has filled with cheaper versions of the best-performing products. They claim to deliver the same performance for less. During these periods it takes greater investment for each unit of gain. As farm costs are increasingly scrutinized, it is common for feed to be viewed as a cost, not an investment.

Real value

When filling their vehicles with fuel, many people seek the cheapest fuel available. After all, any gas of equal octane should perform the same in our vehicles, regardless of price or brand.

However, when we purchase a new vehicle, we are often willing to pay a premium price for a vehicle that is capable of performing more efficiently or lasting longer. This new vehicle has value in which we are willing to invest.

The common perception in aquaculture is that higher profits can be made by spending less money on feed. As in the fuel example, feed is often considered a commodity item. But try to consider feed as the vehicle that carries your fish to the finish line and therefore must provide value. That value comes in the form of rearing more fish to market size with less feed in less time.

Feed potential

Feed costs can contribute up to 60 percent of the expenses for an aquaculture business. It seems logical that a reduction in feed costs could significantly reduce overall costs and improve profits, but this is not the case. Farm profits can be improved significantly by using feeds that perform up to their potential.

How can you determine if your feed is performing up to its potential? The easiest way is to calculate the theoretical feed-conversion ratio (FCR) of your feed using the information provided on the feed label. The first step is to determine the digestible energy level of the diet (Table 1). Once this value is calculated, simple divide 3,745 (kcal required to rear 1 kg of fish) by the kcal/kg of your diet. For the example in Table 1, the theoretical FCR would be 1.24.

Snyder, Calculation of digestible energy, Table 1

Nutrient% of FeedDigestible Energy (kcal/g)Energy Content Contribution
Protein365.0180.0
Fat68.551.0
Fiber400
Moisture1000
Ash1200
Carbohydrates322.270.4
Total100Per 100 g301.4
Per lb1,368.0
Per kg3,014.0
Table 1. Calculation of digestable energy content of feed.

Feed as investment

Better-performing feeds cost more but can improve farm profitability. Spending less only leads to increased savings, not increased profits.

The example provided in Table 2 is data from an intensive farm raising tilapia in the United States. It shows a situation in which basing a feed decision on cost as opposed to profit potential could lead to the wrong decision.

Snyder, Profitability differences, Table 2

 Diet
36-6
Diet
40-10
DifferenceDifference
Input Data
Animals stocked100,000100,0000
Gain/day (g)2.943.350.4113.9%
Average market weight (g)6816810
Survival (%)98980
Feed-conversion ratio1.241.11(0.13)-10.8%
Fingerling cost (U.S. $)0.090.090
Initial weight (g)0.50.50
Market value (U.S. $/kg)2.502.500
Feed cost (U.S. $/kg)0.7040.8450.14120.0%
Overhead/day/fish (U.S. $)0.00220.00220
Calculations
Days in cycle231.46203.13(28.33)-12.2%
Total weight (kg)66,738.0066,738.000
Value at market (U.S. $)166,845.00166,845.000
Cost of fingerlings (U.S. $)9,000.009,000.000
Feed fed (kg)82,863.4173,934.37(8,929.03)-10.8%
Cost of feed (U.S. $)58,335.8462,459.764,123.927.1%
Overhead costs (U.S. $)50,921.0044,689.55(6,232,22)-13.9%
Results
Fingerling cost/kg marketed (U.S. $)0.1350.1350
Feed cost/kg marketed (U.S. $)0.8740.9360.0627.1%
Overhead cost/kg (U.S. $)0.7630.670(0.093)-12.2%
Profit
Income over fingerling, feed and overhead costs48,587.3950.695.692,108.304.3%
Other Factors/Adjustments
Additional growth opportunity (U.S. $)4,744.9814.1%
Advantage for 40-10 diet6,853.2814.1%
Table 2. Profitability differences between tilapia fed a diet containing 36 percent crude protein and 6% lipid (36-6) or a diet with 40 percent crude protein and 10 percent lipid (40-10).

The goals of this facility were to shorten the production cycle, increase growth rate, reduce pollution and reduce total production costs. Several cost increases may catch your attention, such as the 20.0 percent difference in the feed prices, a 7.1 percent increase in total feed cost and a 7.1 percent increase in feed cost per kilogram of fish marketed. Most managers using these figures would conclude that having higher profits with a more expensive feed would not be possible.

However, better feed delivered several valuable returns that more than offset the increased costs. The feed-conversion ratio was improved by 10.8 percent, and the cycle was shortened 28 days. About 10.8 percent less feed was fed. Most significantly, total overhead costs were reduced by 13.9 percent.

Gross profits were improved by 4.30 percent, and if you factor in the value of the shorter cycle, the overall advantage can be valued as a 14.1 percent increase. Scrutinizing this feed decision from the standpoint of cost analysis clearly gave the wrong answer.

Next breakthrough

As aquaculture continues to grow, and we learn to increase the efficiency of our limited land, water and feed ingredient resources, we inadvertently dig ourselves a deeper hole with respect to the sustainability of aquaculture. The reliance of the aquafeed industry on marine ingredients for proteins and fats has decreased significantly over the last 20 years, but over the same time period, total aquaculture production has grown and effectively increased the use of marine-based ingredients. This is not a sustainable practice, nor will it allow aquaculture to take advantage of the 40-mmt seafood shortfall that is predicted by 2030.

Aquaculture is now big enough that science is breeding plants with nutrient profiles suited for aquaculture animals, and the algae industry is beginning to consider the aquafeed industry as a viable option for marketing their products and co-products. Only when aquaculture is trading in ingredients that are controlled by the aquaculture industry as opposed to relying on global commodities can aquaculture grow sustainably and push through this era of diminishing returns.

(Editor’s Note: This article was originally published in the September/October 2012 print edition of the Global Aquaculture Advocate.)