Fish processing is one of the most scoring sections in fisheries exams — and one of the most neglected. Whether you are preparing for ICAR, state fisheries service exams, CIFE entrance, or ASRB, questions on chilling, freezing, canning, smoking, drying and value addition come up again and again. This set of 20 multiple-choice questions covers the concepts examiners actually test, with an answer key and a short explanation for every question.
Images in this post are illustrations created for Fisheries India.
Fish preservation methods at a glance
Before you start the quiz, revise the five ideas that unlock most of the answers:
| Method | How it preserves fish | Key fact to remember |
|---|---|---|
| Chilling | Slows bacterial and enzyme action with ice | Chill store at 0–2 °C |
| Freezing | Stops bacterial growth and slows enzymes | Commercial storage at −18 °C or below |
| Canning | Commercial sterilisation in a sealed container | Shelf-stable for at least two years |
| Drying / salting | Lowers water available to microbes | Works by reducing water activity |
| Smoking | Drying plus antimicrobial smoke compounds | Hot smoking cooks the fish; cold smoking does not |
The 20 questions
Q1. ICAR–Central Institute of Fisheries Technology (CIFT) was set up in which year?
(a) 1947 (b) 1957 (c) 1967 (d) 1972
Q2. ICAR–CIFT is headquartered at which place?
(a) Chennai (b) Kochi (c) Mumbai (d) Visakhapatnam
Q3. Which of the following is NOT a research centre of ICAR–CIFT?
(a) Veraval (b) Visakhapatnam (c) Mumbai (d) Chennai
Q4. As per FAO handling guidance, fish meant for canning should be chill-stored at which temperature range?
(a) 0–2 °C (b) 4–6 °C (c) 8–10 °C (d) 12–15 °C
Q5. Below which temperature do bacteria, including Clostridium botulinum, fail to grow to any significant extent?
(a) 0 °C (b) 2 °C (c) 4 °C (d) 10 °C
Q6. The main objective of canning is a product that stays shelf-stable for at least how long without spoilage?
(a) Six months (b) One year (c) Two years (d) Five years
Q7. Processing times and temperatures for canned fish are generally set to destroy which spore-forming bacterium as the minimum standard?
(a) Aeromonas hydrophila (b) Clostridium botulinum (c) Flavobacterium columnare (d) Vibrio harveyi
Q8. Commercial frozen fish is stored at which temperature?
(a) 0 °C (b) −4 °C (c) −10 °C (d) −18 °C or below
Q9. Which of the following is a traditional method of fish preservation?
(a) Modified atmosphere packaging (b) Smoking (c) High-pressure processing (d) Irradiation
Q10. Surimi is best defined as:
(a) Fish oil extracted from liver (b) Washed minced fish flesh with gel-forming ability (c) Fermented fish sauce (d) Dried fish powder
Q11. Fish meal is:
(a) A ready-to-eat fish snack (b) Crude flour obtained by milling and drying fish or fish by-products (c) A vitamin supplement for humans (d) Fish feed made only from algae
Q12. HACCP stands for:
(a) Hazard Analysis Critical Control Point (b) Health Assessment of Canned and Chilled Products (c) Hygienic Audit for Cold Chain Processing (d) Hazard Avoidance in Commercial Canning Practice
Q13. Drying preserves fish mainly by:
(a) Killing all bacteria instantly (b) Lowering water activity (c) Adding salt (d) Removing oxygen from the pack
Q14. Salting preserves fish because salt:
(a) Cooks the flesh (b) Draws water out of the flesh and lowers water activity (c) Adds protein (d) Seals the surface from air
Q15. Smoking preserves fish through:
(a) Heat alone (b) Drying combined with antimicrobial compounds in smoke (c) Salt alone (d) Freezing the surface
Q16. Which statement about smoking is correct?
(a) Cold smoking cooks the fish, hot smoking does not (b) Hot smoking cooks the fish, while cold smoking does not (c) Both methods cook the fish equally (d) Neither method involves drying
Q17. Glazing of frozen fish means:
(a) Coating with edible oil (b) Applying a thin ice coat to prevent dehydration and freezer burn (c) Vacuum sealing in plastic (d) Dipping in brine before freezing
Q18. IQF in fish processing stands for:
(a) Individually Quick Frozen (b) International Quality of Fish (c) Instant Quick Freezing (d) Inspected Quality Fish
Q19. Scombroid (histamine) poisoning is most associated with:
(a) Properly iced freshwater carp (b) Poorly chilled tuna and mackerel (c) Canned sardines stored correctly (d) Freshly caught trout on ice
Q20. Chitosan, a valuable by-product, is obtained from:
(a) Fish scales (b) Shrimp and crab shell waste (c) Fish liver oil (d) Seaweed extract
Answer key with explanations
| Q | Answer | Why |
|---|---|---|
| 1 | (b) 1957 | CIFT started functioning at Kochi on 29 April 1957 and came under ICAR on 1 October 1967 — do not confuse the two dates. |
| 2 | (b) Kochi | CIFT headquarters is at Kochi (CIFT Junction, Willingdon Island), Kerala. |
| 3 | (d) Chennai | CIFT research centres function at Veraval (Gujarat), Visakhapatnam (Andhra Pradesh) and Mumbai (Maharashtra). Chennai hosts CIBA, not a CIFT centre. |
| 4 | (a) 0–2 °C | FAO canning guidance: fish should be chill-stored between 0 °C and 2 °C, or frozen below −28 °C before processing. |
| 5 | (c) 4 °C | FAO notes that none of the relevant bacteria, including C. botulinum, grow to any significant extent below 4 °C — which is why chilling before canning makes the process safer. |
| 6 | (c) Two years | FAO states the objective of canning as a shelf-stable product storable for at least two years without spoilage, retaining nutritional and sensory quality. |
| 7 | (b) Clostridium botulinum | This spore-former can produce a lethal toxin in food, so processing times and temperatures sufficient to destroy it are the accepted minimum standard for canned fish. |
| 8 | (d) −18 °C or below | Freezing below −18 °C inhibits bacterial growth and enzymatic activity; proper rapid freezing and packaging protect texture and flavour. |
| 9 | (b) Smoking | FAO lists the traditional means of preservation as drying, salting, pickling, smoking and fermenting — long before mechanised freezing and canning. |
| 10 | (b) Washed minced fish flesh | Washing removes blood, fat and water-soluble proteins, leaving myofibrillar protein that forms a strong elastic gel — the base for imitation crab and other products. |
| 11 | (b) Crude flour from fish or by-products | Fish meal is produced from whole fish, fish remains or processing by-products, mainly small pelagics such as anchoveta for reduction. |
| 12 | (a) Hazard Analysis Critical Control Point | HACCP is the preventive food-safety system built around identifying and controlling critical points in processing. |
| 13 | (b) Lowering water activity | Microbes need available water to grow; drying removes it, which is why properly dried fish keeps without refrigeration. |
| 14 | (b) Draws water out, lowers water activity | Salt works by osmosis — water leaves the flesh, available water falls, and most spoilage bacteria cannot grow. |
| 15 | (b) Drying + antimicrobial smoke compounds | Smoke deposits phenols and other compounds that inhibit bacteria, while the heat and air movement dry the fish. |
| 16 | (b) Hot smoking cooks; cold smoking does not | Hot smoking uses heat high enough to cook the product; cold smoking uses low-temperature smoke over a longer time and the fish remains essentially raw. |
| 17 | (b) Thin ice coat | Glazing seals the frozen surface with ice, slowing moisture loss (freezer burn) and oxidation during storage. |
| 18 | (a) Individually Quick Frozen | IQF freezes pieces separately so they do not clump — important for shrimp and small fish portions. |
| 19 | (b) Poorly chilled tuna and mackerel | When scombroid fish (tuna, mackerel and relatives) are held warm, bacteria convert histidine to histamine, which cooking does not destroy. Rapid chilling is the prevention. |
| 20 | (b) Shrimp and crab shell waste | Chitin from crustacean shell waste is deacetylated to chitosan — a classic example of turning processing waste into a high-value product, an area CIFT works on. |
How to use this set
- First attempt: answer all 20 without looking at the key, in 20 minutes — exam pace.
- Second pass: read every explanation, even for questions you got right. The CIFT dates (1957 vs 1967) and the chilling temperatures (0–2 °C, below 4 °C, −18 °C) are the classic traps.
- Revise with the table: if you can reproduce the “methods at a glance” table from memory, you already own half the marks in this topic.
- Next sets to try: pair this with our fish feed & nutrition MCQs, fish disease MCQs, Indian fisheries schemes MCQs and biofloc MCQs for a full revision round.
Frequently asked questions
Is this set based on a real exam paper?
No. This is a practice set written for revision. It is not a leaked or reproduced exam paper, and it carries no exam date or application window.
Which institute should I remember for fish processing questions?
ICAR–CIFT, Kochi (set up 1957, under ICAR since 1967) — India’s only national institute covering the full spectrum from harvest to post-harvest operations, with centres at Veraval, Visakhapatnam and Mumbai.
What is the single most-tested temperature in this topic?
Chilling at 0–2 °C. If a question asks for the chill-store range, that is the answer; the below-4 °C figure is about bacterial growth stopping, and −18 °C is frozen storage — keep the three apart.
Fact-check note
Checked 1 November 2026 against official sources: ICAR–CIFT’s own pages (set up 29 April 1957, Kochi; ICAR control from 1 October 1967; centres at Veraval, Visakhapatnam and Mumbai; only national institute for harvest and post-harvest research) and FAO fish handling and canning guidance (chill storage 0–2 °C; no significant bacterial growth below 4 °C; canning shelf-stability of at least two years; Clostridium botulinum as the minimum processing standard; traditional methods of drying, salting, pickling, smoking and fermenting; fish meal as milled and dried fish or by-products). Standard textbook definitions are used for surimi, HACCP, IQF, glazing, histamine poisoning and chitosan. No deadline, fee or application window is claimed in this post because it is a practice set, not a notification. Where commercial practice varies (for example, frozen storage colder than −18 °C in some plants), the post states the standard textbook figure rather than a plant-specific one.