Almost three-forths of the world's surface is covered in water. This water is home to over 20,000 different species of fish. The earliest fossils of fish date back over 400 million years.
There are a wide variety of fish — from the goby which is less than one half an inch long, to the whale shark which can be over 60 feet long.
Most fish breathe through gills. Gills perform the gas exchange between the water and the fish's blood. They allow the fish to breathe oxygen in the water.
Fish
Fishes are vertebrates that have a skeleton made of either bone or cartilage. About 95% of fishes have skeletons made of bone. These bony fishes have a swim bladder, a gas-filled sac, that they can inflate or deflate allowing them to float in the water even when not swimming. Fishes with a cartilage skeleton tend to be heavier than water and sink. They must swim to keep afloat. Cartilaginous (cartilage) fish include the ray and the shark.
Most fish swim using a tail fin. Muscles in the tail fin move it from side to side, forcing water backward, and propeling the fish forward. Other fins help the fish change direction and stop. Pectoral fins on their side help them swim up and down. Dorsal and anal fins on the top and bottom keep the fish upright. Pelvic fins on the underside help steer left and right.
Many fish eat plants, while others such as the shark, eat other fish.
Is it bull, or is it real? Could there really be sharks circling a butcher shop 30 km inland from the ocean following the Brisbane (Australia) floods?Evidence of bull sharks swimming up flooded city streets seems real, but the stories of feeding behavior are probably over-hyped.It's common to find fish in strange places during a flood, including in normally dry fields. Fish can invade fields to
This is my new hobbies.I try setting up a large tropical freshwater aquarium in my home.
As much as you want to have a nice, big, attractive freshwater aquarium, you only have a small budget with which to set it up. So it's time to settle for the alternative and go the least expensive route. You can try having a fish bowl, a round-shaped, small fish tank which is far cheaper than a standard-sized fish tank. The important thing that you should bear in mind is not to include too many fish in the fish bowl as this may tend to cause an imbalance in the environment for other fish species. The ideal number of fish pets is one or two per normal-sized fish bowl.
Building your own freshwater fish bowl is as easy as 1, 2, 3. You do not need lots of expensive equipment - you just need clean water, a small guppy and some pieces of ornamentation. You can utilize aquatic plants that live in freshwater aquariums to provide a balance in your tank. As long as you remember a few of the basics, you can set up your favorite fish bowl without the help of professionals. The first thing you need to do is decide where to position your fish bowl. In terms of positioning simply place it on the top of a small table or stand. There is certainly no need for a customized stand. Also, you can save on your home's monthly water costs as a fish bowl only uses approximately a gallon (or less) of clean water. You can also save on electricity costs since you do not need water filters.
If you are the type who prefers to have a medium size fish bowl, you can choose to buy low cost lighting equipment for your tank. Again, this is not expensive. However, if you are not the type of person to settle for a small fish bowl, you can set up a mini aquarium to further accentuate your living room. You just need to have a small water filter that helps maintain your tank's water, certain types of fish species such as Bloodfin Tetra and Guppy, live aquatic plants, decorative rocks and sand, and other ornamentations that you may include based on personal preference.
You also need to choose the type of material for your mini freshwater aquarium. Basically, manufacturers offer glass and acrylic aquariums, but you need to understand the advantages and disadvantages of each type. Since you are working with a small budget, you may opt for glass which is less expensive than acrylic. Generally, acrylic is lighter than glass and more readily fashioned into your own unique shape, but it is more expensive and somewhat more easily scratched than glass. However, some acrylic scratches can be polished out, while scratched glass is all but impossible to fix.
No matter how big or small your freshwater aquarium, it does not matter as long as you keep your tank looking good. It is also important that you keep your fish healthy - the main reason to maintain your freshwater aquarium. Sit back, relax and enjoy the company of your fish, regardless of what size of aquarium you choose.
Live aquatic plants can also be a big help in a tropical freshwater aquarium because plants also help utilize the ammonia and reduce waste levels in the tank. Plants also provide shy or frightened fish with hiding places reducing the amount of stress the fish experience which keeps them healthier. Planted tropical freshwater aquariums are often more stable and contain healthier, happier fish than non-planted aquariums.
As for the stand of your mini aquarium, you can personalize it by using some basic carpentry skills or seeking the help of a friend when building it. This way, you can save a significant amount of money compared to buying a custom-made stand from the manufacturer. Determine how high you want the stand to be - high enough for comfortable viewing, but not so high that the aquarium dominates the room.
