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What are some reasons for the decrease in fish numbers world wide?
Wiki User
∙ 13y ago
Global warming. The temperature of the water in a lot of places world wide has increased rendering some species under threat.
Wiki User
∙ 13y ago
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What environmental impact do box jellyfish have?
since they pray on fish eggs, their overpopulation is allowing numbers in fish in the Mediterranean and Australia to decrease at a huge rate.
Why are tetra packs made?
Tetras, like many species of fish, travel is groups. These groups are not packs, they are called schools. There are many reasons for this like safety and numbers and fish like to be with other fish.
What happens it the food chain when you over fish?
When over-fishing of a species in a food chain occurs, this would the species which eats the over-fished fish would reduce in numbers due to less food and species which the fish ate would increase in numbers due to less predators. This effect continues through the food chain, eg if Krill was over-fished, Whales would decrease in numbers because there are less food for them. Anything that eats whales as their main prey would also decrease in numbers due to less food. Krill eats a type of plankton. They would increase in numbers because of less predators. Plankton eat phytoplankton, since there are large numbers of plankton, the phytoplankton would decrease in numbers. Overall, over fishing would cause the food chain/web to become unstable
What is the approximate percent decrease when a fish count goes down from 850 to 500?
A decrease of 41.2%
Did fishing decrease fish population?
yes,fishing for food decreased fish population.
Why did Iroquois use fish hook?
The Iroquois used fish hooks for many reasons. One of these reasons would be for the purpose of catching fish for food.
What will happen if the introduction of piranha in a fish pond are continously done by people?
the number of fish decrease
What will be the economic consequences of the BP oil leak in the Gulf of Mexico?
Well, a couple of bad stuff can happen. 1) Life in the Gulf of Mexico will decrease in numbers . This means that fish would become more expensive, so it has an affect on us. 2) Attendance rate to Mexico , Florida and Texas will decrease in numbers. There is plenty more, But I think these are important.
Are dolphins fish if no then what in the world are they?
They're not fish for a variety of reasons, mostly due to the fact that they breathe air like whales and us. They're mammals belonging to the Delphinidae family.
Is a puffer fish increasing or decreasing in numbers?
yes the puffer fish is increasing in numbers
If fish are caught faster than they can breed all population will?
The population will decrease
How you can decrease your triglycerides?
Taking fish oil supplements typically lowers triglycerides
