* Sea trout (also called "brown trout") are anadromous fish, meaning they live in saltwater but migrate to freshwater rivers to spawn. This means they spend part of their life in freshwater and part in saltwater.
* Freshwater trout (like rainbow trout) are resident fish, meaning they live their entire lives in freshwater.
Similarities:
* They are both trout: Both belong to the same genus (Salmo) and are closely related.
* They share similar appearances: Both have a torpedo-like shape, with silvery scales and a distinctive red or orange spot behind their gills.
* They have similar diets: Both eat insects, crustaceans, and smaller fish.
Differences:
* Saltwater tolerance: Sea trout are adapted to live in both fresh and saltwater, while freshwater trout cannot tolerate saltwater.
* Spawning habits: Sea trout migrate to freshwater rivers to spawn, while freshwater trout spawn within the rivers they inhabit.
* Life cycle: Sea trout spend their early life in freshwater and then migrate to the ocean, eventually returning to freshwater to spawn. Freshwater trout stay in the same rivers throughout their lives.
In summary:
While they share similarities, sea trout and freshwater trout are distinct species with different life cycles and tolerances.