26Migration

πŸ“š
FISH 🐟 MIGRATION
β–’ Types of Fish Migration (Based on Sea and Freshwater):
❖ Diadromous:
β—‰ Definition: Migrate between Freshwater and Sea
β—‰ Catadromous:
β—ˆ Description: Lives in Freshwater and migrates to Sea for breeding
β—ˆ Examples:
β–  Eel (Anguilla):
  1. American eel
  2. European eel
β—‰ Anadromous:
β—ˆ Description: Lives in Sea 🌊 and migrates to Freshwater for breeding
β—ˆ Examples:
  1. Salmon
  2. Sea lamprey
  3. Hilsa
β—‰ Amphidromous:
β—ˆ Description: Migrates between Freshwater and Sea (not for breeding but for feeding), occurs regularly at definite life stages
β—ˆ Examples:
  1. Gobies fish
❖ Potamodromous:
β—‰ Description: Migrates within Freshwater for breeding
β—‰ Examples:
  1. Carp
  2. Trout fishes
❖ Oceanodromous:
β—‰ Description: Migrates within Sea 🌊 for breeding
β—‰ Examples:
  1. Herrings
  2. Mackerels
  3. Tunas
πŸ“š
BIRDS MIGRATION
β–’ Key Fact: Migration of Birds is affected by Gonadotropic hormone