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Related Flashcards
Cards In This Set
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Contranatantly means swimming..
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Against the current
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Denatantly means swimming..
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Drifting/swimming with the current
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Oceanodromy refers to fish that..
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Migrate entirely within salt water
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Potadromy refers to fish that...
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Migrate within fresh water
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Diadromy refers to fish that..
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Migrate between the sea and fresh water as a regular part of the life cycle
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Describe an Anadromy life cycle
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Born in Fresh water, Early feeding and growthLarval/Juveniles migrate to Sea, Most feeding and growthAdults return to Fresh water to reproduce
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Describe a Catadromy life cycle
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Born in the Sea, Early feeding and growthJuvenile migration to fresh water, Most feeding and growthAdults return to the Sea to reproduce
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Describe an Amphidromy life cycle
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Born in Fresh waterLarval migration to Sea, Early feeding and growthJuvenile migration back to fresh water, Most feeding and growthAdults reproduce.
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What are the 4 phases of salmon migration?
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1. Directed coastal migration2. Open ocean migration3. Directed migration to the coast4. Directed coastal migration to natal stream
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The 3 major objectives for BC Salmon during Directed coastal migration are..
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1. Maximize net energy accumulation by feeding actively and minimizing energy expenditure2. Actively swim West/NW3. Swim away from low salinity water
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What are the 2 salmon homing theories?
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1. Imprinting hypothesis2. Pheromone hypothesis
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What is the Imprinting hypothesis?
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Specific odors emanating from the rocks, plants and soil in the home stream system learned as juveniles will stimulate upstream swimming in adult salmon
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What is the pheromone hypothesis?
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Homeward migration of adult salmon is directed by population-specific pheromone trails laid down by juveniles on their way to sea or by pheromones laid by earlier migrating adults
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What are some likely reasons for Diadromy?
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Decreased predation, disease, stressIncreased food availability
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In general, Anadromy is most abundant..
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In Northern regions, and lessens as you move towards the equator.
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