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Acid Rain
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∙ 10y ago
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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.
Which change would decrease the population of small fish the most?
An increase in the autotroph populations
How does the widespread use of drift nets affect the ocean ecosystem?
It reduces populations of fish and other marine organisms. -From Study Island
Is an Arctic char a carnivore?
Arctic char are carnivores that require feed made from wild fish -- causing a drain on the ocean's natural food web.
How can isolation of a group result in new species?
After many changes evolve in a group of animals, individuals of that group can no longer mate with the rest of the species that remain unchanged. That is the definition of species: individuals that are able to breed among themselves but are not able to breed with other species. When a group of individuals is separated from the rest of their species for a long time, the individuals can evolve different traits. The longer the group is isolated from the rest of the species, the more likely it will evolve into a new species. One example of this has been seen in fish species in the lakes of Switzerland, Great Britain, and Scandinavia. Almost every lake has different forms, believed to have evolved from one species.
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
Is the fish population inclining or declining?
Because of increased fishing demand, people are taking fish faster than the fish can reproduce meaning that fish species are declining and someday might be extinct.
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.
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
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
Why do most people in Scandinavia live along the coast?
easy access to transport and lots of fish
How is a natural caused fish kill different from a human caused fish kill?
One is caused by humans, the other is not.
What can be said about the trend in fish populations between 1974 and 2000?
h
What has the author Ernesto Lorda written?
Ernesto Lorda has written: 'The stochastic modeling of the dynamics of fish populations using nonlinear Leslie matrices' -- subject(s): Mathematical models, Fish populations, Cod fisheries
