Fisheries Biology — MCQs August 22, 2025 by u930973931_answers 50 Score: 0 Attempted: 0/50 Subscribe 1. The scientific study of fishes is called: (A) Ichthyology (B) Ornithology (C) Herpetology (D) Limnology 2. The branch of biology dealing with fish culture and management is: (A) Apiculture (B) Pisciculture (C) Horticulture (D) Sericulture 3. The cultivation of fish in ponds or tanks is called: (A) Apiculture (B) Pisciculture (C) Mariculture (D) Sericulture 4. Mariculture refers to: (A) Fish farming in marine water (B) Bee keeping (C) Freshwater fish culture (D) Soil culture 5. The largest fish in the world is: (A) Blue whale (B) Whale shark (C) Great white shark (D) Swordfish 6. The fastest swimming fish is: (A) Tuna (B) Sailfish (C) Shark (D) Mackerel 7. The gas-filled organ that helps fish maintain buoyancy is: (A) Liver (B) Swim bladder (C) Kidney (D) Gill 8. The respiratory organ in fish is: (A) Lungs (B) Gills (C) Skin (D) Trachea 9. Which pigment gives red color to fish muscles? (A) Hemoglobin (B) Myoglobin (C) Chlorophyll (D) Melanin 10. The outer covering of fish is: (A) Fur (B) Scales (C) Feathers (D) Shell 11. Cartilaginous fishes belong to the class: (A) Osteichthyes (B) Chondrichthyes (C) Amphibia (D) Reptilia 12. Bony fishes belong to the class: (A) Osteichthyes (B) Chondrichthyes (C) Amphibia (D) Mammalia 13. The excretory product of freshwater fish is mainly: (A) Uric acid (B) Ammonia (C) Urea (D) Creatinine 14. The excretory product of marine cartilaginous fish is: (A) Uric acid (B) Ammonia (C) Urea (D) Creatinine 15. Anadromous fishes migrate from: (A) Freshwater to marine water (B) Marine water to freshwater (C) River to lake (D) Lake to pond 16. Example of anadromous fish is: (A) Salmon (B) Eel (C) Catfish (D) Tilapia 17. Catadromous fishes migrate from: (A) River to lake (B) Marine water to freshwater (C) Freshwater to marine water (D) Pond to river 18. Example of catadromous fish is: (A) Trout (B) Salmon (C) Eel (D) Rohu 19. Which is the most commonly cultured carp in Asia? (A) Catla (B) Rohu (C) Mrigal (D) Hilsa 20. The main constituent of fish scales is: (A) Keratin (B) Chitin (C) Collagen (D) Calcium phosphate 21. The larva of a fish is called: (A) Fry (B) Fingerling (C) Nymph (D) Nauplius 22. A young fish grown after fry stage is called: (A) Larva (B) Fingerling (C) Nymph (D) Hatchling 23. Fish farming integrated with rice cultivation is known as: (A) Mariculture (B) Paddy-cum-fish culture (C) Composite culture (D) Aquaponics 24. The cultivation of fish along with prawns is: (A) Polyculture (B) Monoculture (C) Aquaponics (D) Paddy-cum-fish culture 25. The breathing hole in cartilaginous fish is called: (A) Spiracle (B) Gill slit (C) Blowhole (D) Operculum 26. The covering of gills in bony fishes is called: (A) Spiracle (B) Operculum (C) Gill slit (D) Spiraculum 27. The antifreeze proteins in polar fishes prevent: (A) Freezing of gills (B) Freezing of blood (C) Freezing of scales (D) Freezing of swim bladder 28. The disease caused in fish due to oxygen deficiency is: (A) Dropsy (B) Hypoxia (C) Fin rot (D) Gill disease 29. The principal source of fish meal is: (A) Shrimp (B) Sardines (C) Crab (D) Lobster 30. Fish oil is a rich source of: (A) Vitamin A and D (B) Vitamin E (C) Vitamin B12 (D) Vitamin K 31. The toxic substance sometimes found in red tides affecting fisheries is: (A) Histamine (B) Saxitoxin (C) Hemotoxin (D) Neurotoxin 32. The Indian major carp species are: (A) Rohu, Catla, Mrigal (B) Trout, Salmon, Eel (C) Sardine, Anchovy, Mackerel (D) Tuna, Cod, Herring 33. A common exotic carp cultured in India is: (A) Rohu (B) Grass carp (C) Mrigal (D) Hilsa 34. Hilsa fish is famous for: (A) Marine culture (B) Anadromous migration (C) Catadromous migration (D) Aquarium culture 35. The most suitable water temperature for carp culture is: (A) 10–15°C (B) 20–30°C (C) 35–40°C (D) 5–10°C 36. Fish hatcheries are mainly used for: (A) Breeding and seed production (B) Fishing (C) Processing (D) Marketing 37. The process of artificial fertilization of fish eggs is called: (A) Insemination (B) Hypophysation (C) Cross breeding (D) Selective breeding 38. Which hormone is commonly used in induced breeding of fish? (A) Insulin (B) Gonadotropin (C) Thyroxine (D) Estrogen 39. The International Commission for the Conservation of Atlantic Tunas (ICCAT) deals with: (A) Salmon (B) Tuna (C) Sardine (D) Eel 40. The study of freshwater ecosystems and their fishes is: (A) Limnology (B) Oceanography (C) Ecology (D) Cytology 41. The term “aquaponics” refers to: (A) Fish farming with poultry (B) Fish farming with hydroponics (C) Marine fishing (D) Freshwater fishing 42. The major cause of fish mortality in ponds is: (A) Overcrowding (B) Oxygen depletion (C) Excess feeding (D) Temperature increase 43. Which fish is called “living fossil”? (A) Latimeria (Coelacanth) (B) Shark (C) Eel (D) Rohu 44. Which fish is widely used in aquariums? (A) Goldfish (B) Tuna (C) Catla (D) Rohu 45. Which type of scales are found in sharks? (A) Placoid scales (B) Cycloid scales (C) Ctenoid scales (D) Ganoid scales 46. Which type of scales are found in bony fishes like Rohu? (A) Placoid scales (B) Cycloid scales (C) Ctenoid scales (D) Ganoid scales 47. The maximum production in composite fish culture comes from: (A) Bottom feeders (B) Surface feeders (C) Middle feeders (D) Predatory fishes 48. The breeding season of Indian major carps is mainly: (A) Winter (B) Summer (C) Monsoon (D) Spring 49. Which organ in fish detects vibrations and water currents? (A) Lateral line (B) Swim bladder (C) Gills (D) Operculum 50. Fisheries play a major role in: (A) Food security and employment (B) Soil fertility (C) Forest regeneration (D) Climate change directly