Can a turtle survive in cold water?
Can a turtle survive in cold water? Red-eared sliders not only can survive in cold water, they do so in the wild, every year. Throughout much of the area that red-eared turtles live, the lakes and ponds they live in get quite cold during the winter. The water temperature is often 40 F and the ponds occasionally freeze over.In fact, this is one reason they are listed as an invasive species in several states. For instance, in Oregon, red-ears have such a listing. This turtle isn’t native to the western US, but there are now breeding populations in many ponds in Oregon. Yearly air temperatures drop well below freezing in Oregon, in the winter, so most ponds freeze over every year. Yet, the population of wild red-eared turtles in Oregon goes merrily along.Our two female red-eared sliders (both females) are kept in a 55-gallon aquarium, 3/4 filled with water and with rocks at one end so they can get out of the water when they choose. The tank isn’t heated, but since it is in the house, the water is never as cold as it gets outdoors in the winter. They’ve thrived in this arrangement for 12 years.However, if we had a pond outdoors, there is little doubt that they would survive much colder water temperatures than ours experience. As long as the water doesn’t freeze solid and the turtles have access to mud and vegetation, they should be fine in cold water.They are more sensitive right after they hatch, but that usually happens in the spring, so in about six months, they become tough enough to withstand and flourish in cold water.
What is the difference between lentic and lotic ecosystem?
Lotic water systems are bodies of water that is flowing continuously, ranging from torrential rapids to slow moving back waters. These systems of water tend to be much shallower than their counterparts, causing temperature to become a major abiotic factor for life in these systems. Water found in these sytems will freeze much quicker, and thaw much faster than the deep waters of lentic systems. Lotic ecosystems depend on precipitation, snow melt, and springs to keep the water flowing, in times of drought these shallow systems will dry up and many organisms will die.Lentic water systems consist of still bodies of water, such as lakes, ponds, and seas. During periods of drought these systems will often last longer than their smaller counterparts and organisms can continue to live despite the shortened supplies. These bodies, often deep with multiple zones experience many things that lotic water systems do not. Lentic water systems are made up of multiple zones, littoral, limnetic , vertical, and benthic. The epilimnion, or surface water, is the area in which the most life can be found. This zone is high in oxygen content during the summers, the warmer waters that receive the most sunlight will hold the most oxygen, thus allowing the greatest amount of life to flourish here. The metalimnion, or middle mass of water is where the temperature of the water begins to decrease, life is not as plentiful as in the surface waters but there are still many organisms that can be found here. Often times this is where thethermocline will begin, a thermocline is a point at which the water temperature decreases approximately one degree Celsius per meter. The hypolimnion is the warmest zone during the winter time and the coldest during the summer. It is the bottom most part of the body, where sometimes light does not reach. This zone is where the least amount of life will be found throughout most of the year. Overturns occur when water is stratified in bodies, the water from the bottom of the mass is mixed with the water close to the surface. This occurs during spring and fall.Lotic Systems vs. Lentic Systems
If ice didn't float on water, what would change in the world?
Water is one of the few substances which expand in volume when frozen, compared to liquid. Usually substances condense when cooled, but at the point of freezing, when liquid water becomes solid ice, the molecules lock into a matrix in which there is more space between molecules - ice expands! This is why ice floats on liquid water.It is this miracle which has shaped the planet and allowed life to thrive. Expansion of ice is responsible for much land-shaping erosion on land, the heaving off of boulders from mountain tops. And the floating of ice on lakes, rivers and oceans - if the frozen water was indeed more dense than liquid water, it would sink and pile up in the cold depths. There would be no life thriving under the ice, overwintering. It would all eventually freeze solid, and all the life forms with it.
Why does ice float on water?
My guess is that you’re asking because you saw that ice cubes float on water, and icebergs, which are pretty much big ice srtuctures, float as well. We’ve all seen Titanic.Did you ever forget a beer, coke or water bottle inside your freezer? Recently, bottle and can designs have been improved to prevent this from happening but I’m sure you know that if you leave a can in the freezer for too long it’ll eventually break, creating a big mess in the freezer. Glass bottles can even explode.This is because water ice occupies more space than liquid water. Now, picture a bunch of people pushing through the gate to board a plane. They would all be packed against the gate. But if you ask them to line up depending on their seat’s zone in the plane, there will be more space between the people. This would require more space for the same amount of people.Very, and I mean very simplified, something like that happens with the water molecules. When temperature drops below a certain point, the water molecules tend to reorganise in a more ordered way forming shapes called crystals. They take more space. So, ice has the same amount of molecules as the liquid but taking more space because they are lined up and not packed against each other. This means water expands when it turns into ice.So, basically, if you have 1 litre of water on your right hand and 1 litre of ice on your left hand, then you have less water on your left hand. With the same volume, 1 litre, ice molecules take more space so you can’t fit as many molecules of water in 1 litre of ice as you can fit in 1 litre of liquid water. Water is denser (more weight in less space) than ice (less weight in more space).Now, when you mix two materials, the denser one will tend to go down, and the less dense one will “be pushed” upwards by the denser one. Try putting some vinegar and some oil (I mean corn oil, the one you use on the salad) in a glass and see how one of the liquids stays up and the other stays down.Ice is less dense than liquid water, therefore, liquid water pushes ice upwards.Edit: Fixed some terrible grammar and type errors.
What is salmon fish called in Urdu? Is it available in Pakistan?
Salmon is a common name used for one of the fish belonging to family Salmonidae (others being Trout, Grayling, Char and Whitefish). Broadly speaking, Salmon fish is included in two Genus. Genus Salmo which is also called Atlantic Salmon and Genus Oncorhynchus which is commonly called Pacific Salmon. Salmo salar (Atlantic Salmon), Oncorhynchus tshawytscha (Chinook Salmon), Oncorhynchus kisutch (Coho Salmon), Oncorhynchus nerka (Sockeye Salmon) and Oncorhynchus gorbuscha (Pink Salmon) are the most common Salmon species native to North America, Russia and Europe.No fish from Genus Salmo or Genus Oncorhynchus are native to Pakistan, India or Bangladesh areas. British did introduce Brown Trout (Salmo truta) in different area of British India in early 20th century. Rainbow trout (Oncorhynchus mykiss) was later introduced in different parts of Pakistan and India. However, no Salmon specie (which is much bigger than trout) has ever been introduced anywhere in Pakistan.A marine fish commonly found in Arabian Sea / Indian Ocean is sold in Pakistan with the name of “Salmon” but it is NOT Salmon. ie, it does not belong to Genus Salmo or Genus Oncorhynchus. This may have caused this confusion that Salmon is available in abundance in Pakistan.Original Salmon (mostly Salmo salar) can only be bought from good fish shops and super stores in big cities of Pakistan . It is imported mostly from Europe and is available mostly in frozen form.
What is pollock and what does it taste like?
Pollock is he nice light White fish that is very mild. If you like any fish at all you will like this fish. It's also the main ingredient in most imitation crab meat because it is so mild it can be flavored. Try it you'll like it. You can fry it, deep fry it, bake it, just don't cook it too much. Salt and pepper both sides. If you are pan frying /searing it, Cook at a med hi in just a bit of oil. It will only take a few minutes to cook. Remember to preheat the pan. Do not move the fish or poke at it until it is opaque halfway up the side. A good heavy pan like cast iron will sustain the high heat without scorching. Only cook just until the white meat flakes. Here is my favorite sauce recipe... Butter. Also if you serve with a baked potato be sure and add plenty of my secret Pollock sauce to the potato as well. In that case it is known as potato sauce. And it's also good on vegetables where it's called... Wait for it … vegetable sauce. Save the leftover crud in the pan and add fresh lemon juice or white wine and some butter and scape up the crud into it making a pan sauce. Can add herbs here if wanted. Parsley chives dill etc.
How did fish originally get into very high lakes in the mountains?
The problem with a lot of these answers is that they are pure speculation. Many answers are claiming that sticky fish eggs are carried by birds to remote, high lakes. It’s plausible, but the trouble is that it’s not science - it’s only a hypothesis.Having read this question and the answers a year or two ago, I went about my life cheerfully believing that the trout, and whatever other fish there are in the alpine lakes of the Cascade Mountains in Washington State, got there naturally. After all, I read it on the Internet :-) !Then, last week my world came crashing down. At Island Lake, a few miles in and 2000 ft up from I-90, we ran into a UW master’s student who was trapping some trout. She said these lakes are all stocked every 3 years by the State. If they weren’t they would have no fish at all, and they historically didn’t have any fish. Even Rainy Lake, which is reasonably remote, is stocked.It doesn’t mean that there is no lake on Earth that was ever granted a population of fish by eggs sticking to a bird’s leg. But it does mean that if you find fish in a remote mountain lake, they almost certainly got there by the hand of man.Yeah, it’s disappointing!