Diadromous fish

Disclaimer: Copyright infringement is not intended.

Context:

A study, published in the British Ecological Society’s Journal of Applied Ecology, found that MPAs designated to protect diadromous fish species did not align with their core habitats.

Diadromous Fish

The fish migrate between fresh and salt water. This term, coined by George S. Myers in 1949, refers to both anadromous and catadromous fishes.
Diadromous life history strategies have evolved in numerous fish taxa.

Differences among catadromous, anadromous, and diadromous fish:

Feature	Diadromous Fish	Anadromous Fish	Catadromous Fish
Definition	Fish that migrate between freshwater and marine environments.	Fish that live in the ocean and breed in freshwater.	Fish that live in freshwater and breed in the ocean.
Examples	European eel, bull shark	Salmon, striped bass, sea lamprey	Europeaneel, American eel
Migration Direction	Both directions: freshwater to marine and marine to freshwater	Marine to freshwater only	Freshwater to marine only
Purpose of Migration	Feeding, breeding, and escaping harsh conditions	Primarily for breeding	Primarily for breeding
Life Cycle Stages	Utilize both freshwater and marine stages	Marine juvenile stage, migrate to freshwater to spawn	Freshwater juvenile stage, migrate to marine to spawn
Adaptation	Adapt to both saltwater and freshwater environments	Adapt specifically for spawning in freshwater	Adapt specifically for spawning in marine
Habitat Usage	Utilize different habitats throughout their life cycle	Spend most of life in marine habitats, migrate to freshwater for spawning	Spend most of life in freshwater habitats, migrate to marine for spawning

Similarities:

Both diadromous types (anadromous and catadromous) migrate between freshwater and marine environments.
Adapted to living in both types of water.
Important for maintaining ecological balance in their respective ecosystems.

Source:

https://www.downtoearth.org.in/news/wildlife-biodiversity/fish-moving-between-marine-freshwater-ecosystems-have-designated-protected-areas-but-no-protection-in-them-study-96402

PRACTICED QUESTION

Match the Following:

List I (Type of Fish):

Catadromous Fish
Anadromous Fish
Diadromous Fish

List II (Characteristics):

A. Fish that migrate between freshwater and marine environments.
B. Fish that live in freshwater and breed in the ocean.
C. Fish that live in the ocean and breed in freshwater.

Options:

A) 1-C, 2-A, 3-B

B) 1-A, 2-B, 3-C

C) 1-B, 2-C, 3-A

D) 1-A, 2-C, 3-B

Answer: C: 1-B, 2-C, 3-A

Explanation:

Catadromous Fish - B (Fish that live in freshwater and breed in the ocean)
Anadromous Fish - C (Fish that live in the ocean and breed in freshwater)
Diadromous Fish - A (Fish that migrate between freshwater and marine environments)