How to Make Fish Flakes and Wafers at Home

Fish flakes and wafers are thin, crispy snack products made from processed fish meat combined with starch, seasonings, and other ingredients. Popular across South and Southeast Asia, these products transform low-value or underutilized fish species into protein-rich, shelf-stable snacks. Whether you call them fish flakes, fish wafers, or fish crackers, the production process is straightforward enough to try at home – and the results can last up to two years when stored properly.

What exactly are fish flakes and wafers? 🔗

Fish flakes (also called fish wafers or fish crackers) are thin, dried sheets made from a mixture of cooked fish meat and starch. Once dried, they can be eaten as-is or deep-fried for a puffed, crispy texture. The concept has deep roots in coastal communities, where preserving fish in dried, portable forms has been practiced for centuries. In Southeast Asia, similar products go by names like keropok in Malaysia and kerupuk ikan in Indonesia, where they remain among the most widely consumed snack foods.

What makes fish flakes particularly valuable from a waste utilization perspective is that they can be made from fish species that are less commercially desirable for direct sale – species with lower market value, trimmings, or by-catch that would otherwise go to waste.

Choosing the right fish species 🔗

Not all fish are equally suited for flake and wafer production. The ideal candidates are species with firm, white flesh, a mild flavour, and low fat content. Commonly used fish include:

Jew fish (Protonibea diacanthus): This large-bodied species yields generous amounts of firm meat, making it well-suited for processing into flakes. Its relatively neutral taste works well with both savoury and sweet flavour profiles.

Croaker: Croaker species are a practical choice because they offer good-quality white meat and have relatively few bones, which simplifies the meat separation step. Research from the International Food Research Journal confirms that different fish species produce crackers with significantly different physical and nutritional characteristics.

Tilapia: Perhaps the most accessible option, tilapia is widely available, affordably priced, and has a neutral taste that readily absorbs seasonings. Its white meat also produces visually appealing, light-coloured flakes.

Other species like threadfin bream, round scad, and even catfish can also be used. The key criteria are freshness, low fat content, and firm flesh. Low-fat fish are preferred because excessive oil interferes with the drying process and can cause the finished flakes to turn rancid more quickly. When selecting fish, look for clear eyes, bright red gills, and flesh that springs back when pressed – classic indicators of freshness.

Step-by-step production process 🔗

Step 1: Cleaning and cooking the fish 🔗

Start by thoroughly cleaning the fish – remove scales, gut the fish completely, and wash under running water. The cleaned fish is then cooked, typically by steaming or gentle boiling. These methods keep the meat moist and intact while making it easy to separate from the bones. Boiling at around 100°C for 20-30 minutes is standard practice. Avoid overcooking, as this turns the meat mushy and makes it difficult to form into proper flakes later.

Step 2: Separating meat from bones 🔗

Once the fish has cooled, carefully separate the meat from the bones, skin, and any remaining connective tissue. This step requires patience and attention – even small pin bones left in the final product can be a safety hazard. Use your fingers to flake the meat apart and check multiple times for any missed bones. The deboned fish meat should then be broken into uniform pieces.

Step 3: Grinding and mixing with starch 🔗

The deboned fish meat is ground into a fine paste using a grinder, food processor, or mortar and pestle. This paste is then mixed with starch – the binding agent that holds everything together during forming and drying.

The most commonly used starch is tapioca starch (also called tapioca flour), which is known to produce flakes with excellent expansion properties when fried. According to research published in the Journal of Entomology and Zoology Studies, tapioca-based fish crackers scored the highest in sensory evaluations for crispiness, texture, and overall acceptability compared to those made with rice or sago starch. Other options include corn starch, sago starch, or rice flour. Some producers use a combination of starches for optimal results.

A typical ratio is about 50% fish meat to 50% starch by weight, though this can vary. Higher fish content increases protein levels but reduces expansion during frying. A study in the journal Molecules used a 1:1 ratio of tapioca starch and fish meat along with 2% salt, 1% sugar, and 30% water, which produced good results.

Along with starch, additional ingredients are mixed in at this stage: salt (for preservation and flavour), sugar (optional, for sweet varieties), and iced water to help form a smooth, workable dough. Some producers also add a small amount of sodium bicarbonate to improve expansion during frying, and monosodium glutamate (MSG) for enhanced umami flavour.

Step 4: Forming into thin films 🔗

The mixed fish-starch dough needs to be formed into thin, uniform sheets. There are two common approaches:

Direct spreading method: The dough is spread directly onto flat surfaces (trays, boards, or banana leaves) using a rolling pin or spatula to achieve a uniform thickness of about 2-3 mm.

Moulding and slicing method: The dough is first shaped into cylindrical or rectangular logs (about 4-5 cm in diameter), then steamed or boiled for 30 minutes at around 90-100°C. After cooking, the logs are chilled overnight in a refrigerator to firm up, then thinly sliced into 2-3 mm pieces. This method, widely used in commercial keropok production, tends to produce more uniform slices and is preferred for large-scale operations.

Step 5: Drying 🔗

Drying is where fish flakes develop their characteristic texture. The goal is to reduce moisture content to around 10-12%, which ensures long shelf life and good expansion when fried.

Sun drying: The traditional and most cost-effective method. Spread the formed flakes on clean drying trays or mats and expose them to direct sunlight for 6-8 hours. Turn them periodically for even drying. The downside is dependence on weather conditions and the need to protect against dust and insects.

Mechanical drying: Commercial operations use cabinet dryers set at 40-60°C for 10-12 hours. This method provides consistent results regardless of weather. Temperatures between 50-70°C with controlled air circulation are considered optimal.

The flakes are ready when they feel dry, firm, and slightly brittle. At this stage, they are considered unfried flakes – a semi-finished product that can be stored and later fried before consumption, or sold as-is for consumers to fry at home.

Step 6: Frying (optional) 🔗

To produce ready-to-eat fried flakes, the dried wafers are deep-fried in vegetable oil at 180-200°C for about 15-30 seconds. The high temperature causes the moisture trapped inside the starch matrix to rapidly convert to steam, puffing the thin flake into a light, crispy product. Research shows that frying at 180°C produces the highest expansion – up to 95% linear expansion – though it also leads to higher oil absorption.

The fried flakes should puff up significantly and turn a light golden colour. Remove them promptly and drain on absorbent paper to remove excess oil.

Flavouring options 🔗

Fish flakes are versatile when it comes to flavour. Seasonings can be added during the mixing stage or applied after frying. Common flavour profiles include:

Savoury varieties: Spices like chilli powder, black pepper, garlic powder, turmeric, and cumin are popular additions. Salt and MSG enhance the overall savoury taste.

Sweet varieties: Sugar or jaggery can be incorporated into the dough to create a sweet version of the flake. These are less common but have a niche market, particularly as a snack for children.

Herb-infused: Fresh or dried herbs like coriander, curry leaves, or lemongrass can add distinctive regional flavours.

The neutral flavour of fish like tilapia makes them especially good base materials, as they readily take on whatever seasoning profile is desired.

Nutritional value of fish flakes 🔗

Fish flakes offer a notable nutritional advantage over typical starch-based snacks. Dried fish crackers typically contain 22-24% protein with relatively low lipid content before frying, according to research conducted on various starch-fish cracker combinations. The protein in fish flakes includes essential amino acids, and some studies have found that amino acid content in fish crackers exceeds FAO requirements for adults.

However, frying does significantly increase the fat content due to oil absorption. A typical serving of 30 grams of fried fish crackers contains roughly 150 calories, 3 grams of protein, 7 grams of fat, and 18 grams of carbohydrates. The unfried version is leaner and may be preferable for health-conscious consumers.

Fish flakes also provide minerals like calcium and phosphorus, especially when made from species with finer bones that get incorporated during grinding.

Packaging and shelf life 🔗

Proper packaging is critical for maintaining quality and extending shelf life. Fish flakes are typically packed in:

Polyester (PET) bags: These provide good moisture barrier properties and keep the product visible to consumers.

HDPE/LDPE bags: High-density polyethylene and low-density polyethylene bags are affordable and widely used for packaging dried fish products. They offer reasonable protection against moisture.

For commercial operations, multi-layered packaging films – combining polyester, polyethylene, and aluminium foil layers – offer superior protection. A study from Universiti Putra Malaysia found that packaging with an aluminium layer (PET-PE-ALU-LLDPE) provided better resistance to lipid oxidation compared to metallized polyethylene packaging, helping maintain quality over longer storage periods.

When stored properly in sealed packages under cool, dry conditions, unfried fish flakes can last up to two years. Fried fish flakes have a somewhat shorter shelf life due to higher fat content and the risk of oxidative rancidity, but proper packaging can extend their usability to several months. Vacuum packaging has been shown to maintain both microbiological and physicochemical properties for around 180 days at room temperature.

Key storage tips: keep the product away from direct sunlight (UV radiation accelerates rancidity), maintain a dry environment, and ensure packaging is fully sealed after each use.

Selling fish flakes: fried vs. unfried 🔗

Fish flakes enter the market in two main forms, each with distinct advantages:

Unfried (dried) flakes: These are the semi-finished product – dried wafers that the consumer fries at home. They are lighter, cheaper to transport, and have a much longer shelf life. This format is common in wholesale and rural markets.

Fried (ready-to-eat) flakes: These are the finished, puffed-up product ready for immediate consumption. They command a higher retail price and are more convenient for urban consumers. However, they require better packaging to prevent moisture absorption and rancidity.

Small-scale producers often start by selling unfried flakes, which require less investment in packaging and frying equipment. As the business grows, offering both formats can help capture a wider market.

Common mistakes to avoid 🔗

Using stale fish: Any off-flavours in the raw fish will carry through to the final product. Always start with the freshest fish available.

Inconsistent thickness: Uneven slicing leads to uneven drying and inconsistent frying. Aim for uniform 2-3 mm thickness throughout.

Insufficient drying: If moisture content remains too high, the flakes will not expand properly during frying, and shelf life will be drastically reduced. Target a final moisture content of 10-12% for dried flakes.

Frying at the wrong temperature: Oil that is not hot enough will result in greasy, poorly expanded flakes. Oil that is too hot will burn the outside before the inside puffs. Maintain a steady 180-200°C.

Poor packaging: Even well-made flakes will deteriorate quickly if not packaged in moisture-proof, airtight bags. Investing in quality packaging pays for itself in extended shelf life.

Why fish flakes matter for sustainability 🔗

Fish flakes represent an excellent model for fish by-product and waste utilization. They allow processors and fishing communities to add value to low-cost fish species, by-catch, and trimmings that would otherwise be discarded or sold at very low prices. The long shelf life of dried fish flakes also addresses food security concerns by making protein-rich fish products available in areas far from the coast and during off-season periods.

The processing technology is accessible – it requires no expensive equipment and can be scaled from kitchen-level production to a small factory. This makes fish flakes a viable livelihood option for fishing communities, particularly women’s self-help groups and small-scale entrepreneurs in coastal regions.

What do you think? Could fish flakes and wafers become a mainstream healthy snack alternative in your region, or are there barriers – like consumer perception or access to raw materials – that would need to be addressed first? If you have tried making fish-based snacks at home, what fish species and flavour combinations worked best for you?

References

1. https://en.wikipedia.org/wiki/Fish_cracker
2. http://www.ifrj.upm.edu.my/24%20(05)%202017/(3).pdf
3. https://www.researchgate.net/publication/335741370_FISH_CRACKER_PAPER
4. https://www.mdpi.com/1420-3049/30/5/1139
5. https://www.tandfonline.com/doi/full/10.1080/10942912.2012.685681
6. https://www.researchgate.net/publication/229865748_Effect_of_fish_to_starch_ratio_on_viscoelastic_properties_and_microstructure_of_fish_cracker_'keropok'_dough
7. http://www.foodandnutritionjournal.org/volume7number2/stability-of-fried-fish-crackers-as-influenced-by-packaging-material-and-storage-temperatures/