Fishery Science plays a crucial role in the agricultural sciences, contributing significantly to sustainable food systems, rural livelihoods, and aquatic biodiversity management. For aspirants preparing for competitive agriculture exams such as ICAR-JRF/SRF, ARS/NET, IBPS-AFO, State Agricultural Services, and university entrance tests, having structured and topic-wise study materials can greatly enhance their preparation. This Fishery Science Notes and MCQs PDF is a well-curated compilation that includes detailed theory and more than 1500 MCQs distributed across 17 vital topics, covering the breadth and depth of fishery-related knowledge. Fisheries Important 100 MCQ Switch Language Fisheries Important 100 MCQ The number of chambers in the heart of fishes is: a) 1 b) 2 c) 3 d) 4 Answer: b) 2 The number of semicircular canals in Gnathostomes is: a) 2 b) 3 c) 4 d) 5 Answer: b) 3 In Heteropneustes fossilis, the total number of barbels present is: a) 2 b) 4 c) 6 d) 8 Answer: c) 6 Adaptive radiation in fishes started approximately how many million years ago? a) 1200 b) 500 c) 1000 d) 1500 Answer: b) 500 The number of species of Osteichthyes (bony fishes) is approximately: a) 10,000 b) 15,000 c) 20,000 d) 25,000 Answer: d) 25,000 The amount of protein in the live body weight of fish is: a) 10-13% b) 15-20% c) 18-23% d) 5-12% Answer: b) 15-20% In fish bodies, the share of minerals is: a) 1-2% b) 3-4% c) 4-5% d) 5-6% Answer: a) 1-2% Cartilaginous fishes belong to the class: a) Placoderms b) Acanthodians c) Chondrichthyes d) Osteichthyes Answer: c) Chondrichthyes The pH of vermiculture is kept at: a) Near neutral b) Alkaline c) Acidic d) Highly alkaline Answer: a) Near neutral If more than a single species of fish is cultured at a time, it is called: a) Monoculture b) Aquaculture c) Polyculture d) Mariculture Answer: c) Polyculture Pisciculture refers to the rearing and production of: a) Fishes b) Birds c) Reptiles d) Wool-yielding animals Answer: a) Fishes Induced breeding techniques are used in: a) Marine fishery b) Capture fishery c) Culture fishery d) Inland fishery Answer: c) Culture fishery Inland fisheries involve: a) Deep-sea fishing b) Capturing fishes from the sea coast c) Raising and capturing fishes in freshwater d) Oil extraction from fish Answer: c) Raising and capturing fishes in freshwater Isinglass is employed in: a) Preparation of wines b) Clearing of wines c) Distillation of wines d) Preservation of wines Answer: b) Clearing of wines Which state is the largest fish-producing state in India? a) Gujarat b) West Bengal c) Andhra Pradesh d) Maharashtra Answer: c) Andhra Pradesh What percentage of India’s GDP is contributed by the fisheries sector? a) 1.05% b) 2.5% c) 0.5% d) 1.8% Answer: a) 1.05% Which fish has the highest protein content? a) Sardine b) Mackerel c) Catla d) Tuna Answer: d) Tuna Which organization is responsible for promoting fish exports in India? a) NFDB b) FAIDF c) MPEDA d) CIFA Answer: c) MPEDA Which fish species is the state fish of Kerala? a) Hilsa b) Indian Featherback c) Green Chromide d) Mahanadi Mahseer Answer: c) Green Chromide Which of the following is a brackish water fish species? a) Tuna b) Mahseer c) Hilsa d) Mullet Answer: d) Mullet Which of the following is a freshwater fish? a) Hilsa b) Catla c) Mackerel d) Sardine Answer: b) Catla The process of breeding fish in controlled environments is known as: a) Mariculture b) Aquaculture c) Pisciculture d) Polyculture Answer: c) Pisciculture Which of the following is a major carp species commonly cultured in India? a) Tilapia b) Catfish c) Rohu d) Trout Answer: c) Rohu The term “brackish water” refers to: a) Freshwater b) Saltwater c) A mixture of freshwater and saltwater d) Stagnant water Answer: c) A mixture of freshwater and saltwater Which of the following is a method of fish preservation? a) Smoking b) Fermentation c) Freezing d) All of the above Answer: d) All of the above The primary purpose of a fish hatchery is to: a) Catch wild fish b) Breed and raise fish for stocking c) Process fish for consumption d) Study fish behavior in the wild Answer: b) Breed and raise fish for stocking Which of the following is a common method used to catch fish in large quantities? a) Angling b) Trawling c) Spearfishing d) Handpicking Answer: b) Trawling The term “bycatch” refers to: a) Fish that are farmed in captivity b) Non-target species caught during fishing c) Fish that are released after being caught d) Fish that are too small to be sold Answer: b) Non-target species caught during fishing Which of the following is a major challenge in sustainable fisheries management? a) Overfishing b) Habitat destruction c) Climate change d) All of the above Answer: d) All of the above The Exclusive Economic Zone (EEZ) of a country extends up to how many nautical miles from its coast? a) 12 b) 24 c) 200 d) 500 Answer: c) 200 Which of the following is a catadromous fish? a) Salmon b) Eel c) Trout d) Tuna Answer: b) Eel The term “demersal” refers to fish that: a) Live near the water surface b) Inhabit the water column c) Live near or on the sea floor d) Migrate between freshwater and saltwater Answer: c) Live near or on the sea floor Which of the following is a common method for assessing fish population size? a) Mark-recapture b) Electrofishing c) Sonar surveys d) All of the above Answer: d) All of the above The primary purpose of a fish ladder is to: a) Assist fish in bypassing obstacles like dams b) Measure fish length c) Trap fish for tagging d) Provide shelter for fish Answer: a) Assist fish in bypassing obstacles like dams Which of the following is a non-native invasive fish species in many parts of the world? a) Common carp (Cyprinus carpio) b) Atlantic cod (Gadus morhua) c) Bluefin tuna (Thunnus thynnus) d) Rainbow trout (Oncorhynchus mykiss) Answer: a) Common carp (Cyprinus carpio) The term “anadromous” refers to fish that: a)
