A food worker prepares a raw fish fillet for cooking. Which food hazard must be removed?
Bones. Fish bones are a natural physical hazard that can cause choking or internal injury, so the food worker must remove them (deboning) during preparation. Bones is the correct multiple-choice option, distinct from biological or chemical hazards.
The answer
When a food worker prepares a raw fish fillet, the hazard that must be physically removed is bones. Fish naturally contain small pin bones and larger bones that, if left in the fillet, can cause a customer to choke or suffer injury to the mouth, throat, or digestive tract. Because bones are a solid foreign object in the food, they are classified as a physical hazard, and the worker removes them by deboning the fillet before cooking and serving.
So on the multiple-choice question, bones is the correct answer. Options such as bacteria, parasites, or cleaning-chemical residue describe real hazards, but they are not the item you remove by hand during fillet preparation.
The three types of food hazards
Understanding why bones is the answer requires knowing the three categories food-safety programs use:
- Physical hazards — hard or sharp foreign objects that can injure someone: bones, glass, metal shavings, plastic, jewelry, hair, or stones. Bones in fish fall squarely here.
- Biological hazards — living organisms and their toxins: bacteria (like Salmonella), viruses, parasites, and fungi. Fish can carry these, but they are controlled by cooking to a safe internal temperature or by freezing, not by picking something out with your fingers.
- Chemical hazards — harmful substances such as cleaning agents, sanitizer residue, pesticides, or naturally occurring toxins (like scombrotoxin/histamine in improperly stored fish).
Bones is a physical hazard because it is a hard, natural object embedded in the food that could injure the person eating it.
Why the other options are wrong
- Bacteria / viruses (biological) — you cannot "remove" bacteria by hand during prep. They are reduced by cooking the fish to the required internal temperature (145°F / 63°C for most fish) and by proper cold storage and hygiene, not by deboning.
- Parasites (biological) — fish parasites are controlled by cooking or by the freezing requirement for fish served raw, again not by manual removal during fillet prep.
- Chemical residue — chemicals are prevented by proper storage, labeling, and rinsing procedures, not by removing something inherent to the fish.
Each of these is a legitimate hazard category, but only bones is the natural physical object a worker takes out of the fillet by hand while preparing it for cooking.
The bigger picture
Controlling food hazards means matching the right control to the right hazard type. Physical hazards like bones are handled by inspection and removal; biological hazards by time-temperature control, cooking, and hygiene; chemical hazards by safe storage and separation. Recognizing that a fish bone is a physical hazard — and that deboning is the correct control — is exactly the kind of reasoning food-handler exams test. It shows you can classify a hazard and choose the control that actually addresses it.
| Physical | Bones, glass, metal, plastic, hair | Inspection and manual removal | Remove pin bones from the fillet |
| Biological | Bacteria, viruses, parasites | Cook to safe temp; freeze; hygiene | Cook fish to 145°F / freeze if served raw |
| Chemical | Cleaners, sanitizer residue, toxins | Proper storage, labeling, rinsing | Store fish cold to prevent histamine toxin |
Frequently asked
What are the three types of food hazards?
Food hazards fall into three categories: physical (foreign objects like bones, glass, or metal), biological (bacteria, viruses, and parasites), and chemical (cleaning agents, sanitizer residue, and natural toxins). Each type is controlled with different methods.
Is a fish bone a physical or biological hazard?
A fish bone is a physical hazard. It is a hard, natural object in the food that can cause choking or injury to the mouth, throat, or digestive tract, so it is removed by deboning during preparation rather than by cooking.
What physical hazards are found in seafood?
The most common physical hazard in seafood is bones, including small pin bones. Others can include fragments of shell, scales, or foreign objects introduced during handling such as metal or plastic. Workers control these by inspecting and removing them during preparation.
How do food workers prevent physical hazards?
Workers prevent physical hazards by inspecting food during preparation and removing foreign objects like bones, and by controlling the environment: keeping glass, metal, and jewelry away from food, wearing hair restraints, and maintaining equipment so parts do not break off into the food.