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Transcript of Atlantic Salmon
Pollution Tolerance & IBI
"Smoltification": ability to transition from freshwater to saltwater
Pacific salmon: difference that Atlantic have less than 13 rays in the anal fin
Females will lay about 7,500 eggs, but only 15-35% will survive.
Spawning from October to Novemer
North Atlantic Ocean
Parr: shallow, riffled, freshwater streams with a fast current
Hooked lower jaw in males
color: sea, freshwater, spawning, post-spawn
Pre-grisle: plankton & amphipods
Adult: small fish and crustaceans, such as smelts, small mackerel, and cmall cod
Smolt-Grisle: open, northern saltwater seas
Kelt: return to freshwater to spawn and die
From USA, Canada, and Eastern Europe freshwater to Greenland to feed and back to freshwater
Females create "redd", or nest by generating water currents to dig a hole in the gravel-bottom riffle area
Eggs fertilized outside the body and incubate from 40 days (10-12°C) to 145 days (3°C)
"Chemotactic" senses allow smolts to return to their home stream.
Salmon and trout
Andipose fin, soft fin rays, pelvic fins with more than 6 rays, pectoral fin nearly horizontal, cycloid scales
Family Oncorhynchus: pacific salmon, trout, char
8-12 (up to 30) pounds