62
Fish Physiology and Biochemistry- ICAR JRF/SRF 2024
MCQ (Single Correct)
+4
−1
Which is not a characteristic of a demersal egg?
EXPLANATION
Oogenesis, Vitellogenin Uptake, Cortical Alveoli Dynamics, Chorion Hardening and Spawning Biology
- Characteristics of Demersal Fish Eggs:
- Demersal Eggs: Sinking eggs spawned by benthic, littoral, or freshwater fishes.
- Characteristics:
- High specific gravity ($\gt 1.025$): Heavier than ambient water so they sink to the bottom substrate.
- Large size ($\ge 1.0-5.0\text{ mm}$) with rich yolk stores.
- Thicker, tough chorionic envelope to resist mechanical abrasion.
- Lower fecundity compared to pelagic broadcast spawners.
- "Less specific gravity" is a property of buoyant pelagic eggs, not demersal eggs.
- Correct Option: Option 2 (Less specific gravity).
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