The advanced, transparent, dorso-ventrally flattened pelagic larval stage possessing large raptorial appendages and a broad shield-like carapace is designated as the Alima larva.
Correct Option: Option 2 (Squilla).
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7
ICAR JRF Fisheries Resource Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Caudal fin is formed in which stage of a finfish larvae
In teleost larval ontogeny, development proceeds through three defined stages:
Preflexion: Notochord is completely straight; median fin fold is present.
Flexion: The posterior tip of the notochord flexes upward (dorsally) as hypural bones condense.
Postflexion: Notochord flexion is complete; hypural bones, parhypural, and principal caudal fin rays are fully formed and articulated, completing the functional caudal fin.
Correct Option: Option 3 (Postflexion stage).
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8
ICAR JRF Fisheries Resource Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Hard parts especially Otoliths are used for age estimation in fish due to
Sagittal Otoliths: Acellular calcium carbonate (aragonite) concretions located in the inner ear sacculus of teleost fishes.
Key Advantages for Sclerochronology:
Continuous Incremental Growth: Otoliths grow continuously throughout the fish's lifespan via daily and annual accretions of alternating translucent and opaque proteinaceous zones.
No Resorption: Unlike scales, fin rays, and vertebrae, otoliths are never metabolically resorbed or remodeled during periods of starvation, calcium stress, or gonad maturation.
Correct Option: Option 3 (Otolith growth is continuous).
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