Fish Conservation Flashcards
What are emerging contaminants?
Emerging contaminants are things that have shown up in environmental monitoring samples that may cause ecological or human harm.
What are endocrine disruptors? What happens to fish when exposed?
Endocrine disruptors are hormones and & hormone mimics that interfere with the body’s hormones and can cause weird development or intersex in fish.
What are three vectors of non-native fish introductions and how is it possible to control them?
Deliberate introductions: legal & illegal: more regulations can only do so much
Aquaculture escapes: More secure aquacultures??
Ballast water: cleaning ballast and boat hulls before entering different aquatic areas.
What is a natural flow regime?
The characteristic pattern of a river’s flow quantity, timing, duration, and variability.
How has human activity altered natural flow regimes and what happens to the fish?
Dams, water withdrawal, watershed alterations, and channels can change the characteristics of a river’s flow pattern. Fish may be unable to cope physically with changes like a dam, and some may lose any time of coverage, leaving populations to crumble.
What does overfishing do to fish populations?
Often, overfishing depletes a population until it is no longer financially practical to continue fishing for them. This allows the now small fish population to recover. Assuming their environment is still habitable and free from things that prevent them from successfully rebuilding their population. Tuna is an exception to this rule; they are still being fished despite their small population because of their worth. This could drive tuna to extinction.
Direct vs indirect effects of global climate change on marine and freshwater systems?
Direct: temperature of water changing?
Indirect: habitat loss like kelp forests not growing, coral bleaching, pH changing,
