Marine Fish Part 2 Anadromous vs. Catadromus Fishes Anadromous Fishes Fish that live predominantly in the ocean but that spawn in freshwater (In the next slide only the salmon are anadromous) Migration Routes of Salmon and Tuna The Bears (and Salmon) of Pack Creek An Aerial View Of A Few Islands Landing And Wet Feet – Tide Is Going Out! This Grizzly Just Walked Away From a HalfEaten Meal Bonaparte’s Gulls Waiting For the Remains Huntin Fer Food! Drat! That Salmon Cut Right and I Went Left! I Finally Caught One! Ah - A Glass of White Zinfandel Would Go Great With This ! Spawning Salmon – Pink and Chum in July – August period Gulls Will “bob” For Salmon Below The Surface Bald Eagle – Checking Things Out Above Pack Creek Five species of salmon live in Alaska and migrate at different times of the summer into streams to spawn. A food chain composed of many marine organisms that culminates in salmon now is extended to land via grizzlies, bald eagles and an assortment of gulls …. It is all part of the circle of life A Small Part Of The Food Chain Bald Eagles Grizzlies Gulls Scav. Pred. Adult Salmon Roe Catadromous Fishes Fish that live predominantly in freshwater but return to the ocean to spawn Two Species Of Freshwater Eels American Eel European Eel (blue) (red) Spawning • Some species migrate to spawn • Some species of fish are “broadcast spawners” • Others have extensive courtship displays as in the cod and its close relative, the haddock • Fertilization may be internal (sharks and a few bony fish) or external • Number of eggs produced in a spawn is directly correlated to extent of parental care Mating Behavior in the Atlantic Cod Cod and haddock are closely related fish!