Fishes which migrate to freshwater for breeding are called:

Correct option is B

→ Anadromous fishes live mainly in the sea but migrate to freshwater for breeding/spawning.
→ Examples include Salmon, Hilsa, and Shad.
→ They undertake long migrations to reach freshwater rivers where eggs are laid, ensuring survival of the young due to safer, nutrient-rich river environments.
Information Booster:
→ Anadromous migration is triggered by environmental cues like temperature, salinity changes, and hormonal signals.
→ These fishes show strong homing instincts, often returning to the exact river where they were born.
→ Anadromy is an adaptation for better reproductive success and juvenile survival.
Additional Information (Other Options):
Option (a) Potamodromous: Fish that migrate within freshwater only.
Option (c) Catadromous: Fish that migrate from freshwater to the sea to breed (e.g., Eel).
Option (d) Diadromous: A broad term for fishes that migrate between sea and freshwater (includes anadromous and catadromous).