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What bad effects are caused by ddt for fish?
DDT, a synthetic pesticide, has detrimental effects on fish populations primarily through bioaccumulation and biomagnification in aquatic ecosystems. It disrupts endocrine functions, leading to reproductive issues and developmental abnormalities in fish. Additionally, DDT can reduce fish populations by impairing immune systems, making them more susceptible to diseases. The chemical's persistence in the environment leads to long-term ecological impacts, threatening aquatic biodiversity.
Why do streams need to be stocked?
Streams are stocked for multiple reasons, mainly to restore or maintain fish populations. Some streams cannot support fish reproduction, so, stocking of fish into the stream can bolster the population to create a sustainable reproducing population. Other times stocking is done to maintain fish populations strictly for recreational uses, and must be done repeatedly.
What populations are in the aquatic ecosystem?
The aquatic ecosystem includes a diverse range of populations, primarily categorized into two main groups: freshwater and marine organisms. Freshwater populations consist of species found in rivers, lakes, and wetlands, such as fish, amphibians, and various aquatic plants. Marine populations inhabit oceans and seas, encompassing a wide variety of fish, marine mammals, invertebrates, and coral reefs. Additionally, microorganisms like phytoplankton and zooplankton play crucial roles in both environments, forming the foundation of the food web.
Where are Nile perch in the ecosystem?
Nile perch are top predators in their ecosystem, usually found in lakes and rivers in East Africa. They play a significant role in controlling populations of smaller fish and help maintain the balance of the ecosystem. However, their introduction to new habitats outside their native range has led to disruptions in native fish populations.
What is an ichythologist?
An ichthyologist is a scientist who studies fish, including their biology, behavior, distribution, and conservation. They often work to understand fish populations, habitats, and ecosystems in order to manage and protect these aquatic resources.
Is the fish population inclining or declining?
The fish population is declining due to overfishing, habitat destruction, and pollution. Conservation efforts and sustainable fishing practices are needed to help stabilize and increase fish populations.
What threats exist to shark populations and what is being done to help prevent shark populations from declining?
I THINK THE THREATS ARE NETS AND FISH HOOKS AND PEOPLE KILLING THEM
What is a major export from Scandinavia Europe?
Fish.
Why fish and potatoes are common foods eaten in Scandinavia?
Scandinavia is surrounded by water, so fish are easily available. Because of the extreme cold of Scandinavia, growing crops is difficult. But potatoes are easier to grow, because they grow underground.
What kills fish in lake Victoria?
Fish in Lake Victoria are primarily threatened by a combination of factors including pollution, overfishing, and the introduction of invasive species, particularly the Nile perch. Eutrophication caused by agricultural runoff leads to harmful algal blooms, which deplete oxygen levels in the water, further stressing fish populations. Additionally, habitat destruction and climate change contribute to the declining health of the lake's ecosystem. These factors together create a challenging environment for native fish species to survive.
Why fishing fleets are declining in primary sectors?
because there are no fish
What are the pond populations?
fish, turtles
Why are salt and fresh water fish declining?
because theres a tribal war
Why do most people in Scandinavia live along the coast?
easy access to transport and lots of fish
What bad effects are caused by ddt for fish?
DDT, a synthetic pesticide, has detrimental effects on fish populations primarily through bioaccumulation and biomagnification in aquatic ecosystems. It disrupts endocrine functions, leading to reproductive issues and developmental abnormalities in fish. Additionally, DDT can reduce fish populations by impairing immune systems, making them more susceptible to diseases. The chemical's persistence in the environment leads to long-term ecological impacts, threatening aquatic biodiversity.
How is a natural caused fish kill different from a human caused fish kill?
One is caused by humans, the other is not.
What has the author Dick McWilliams written?
Dick McWilliams has written: 'An evaluation of several types of gear for sampling fish populations' -- subject(s): Fish populations, Measurement
