Class – Cartilaginous fish / subclass – Plasminogene fish (Elasmobranchii) / Superorder Sharks (Selach)
History of the study
The history of the evolution of hammerhead sharks has been very successful. In our days it is one of the most common shark species in the world, and in some places they’re just going in astounding quantities. Hundreds of individuals run around seamounts.
Few other species of sharks form such large flocks. This is one of the greatest mysteries of the ocean. Why are so many of these sharks gathered in one place, at one time. Oddly enough, in these large schools the majority are female, and we don’t yet know why this happens.
Widely distributed in tropical and temperate waters of all oceans, except, of course, the Arctic. Most commonly found in the Gulf of Mexico and Caribbean sea, near Hawaii, Philippines, New Zealand and many other seas of warm and temperate latitudes.
Hammerhead shark is truly one of the most unusual sharks. Her appearance seems truly alien, but it is quite common in tropical seas around the world.
When you look at the shark hammer head there is just one question – why this animal has this kind of pharmagology? What is it? And how it appeared? After all, nature creates freaks. And if it generates by mistake, they can not compete with “normal” types and die. All the more strange that there are many types of hammerhead sharks of all shapes and sizes, at least 9 different species. Surely nature could make so many mistakes and “give birth” so many freaks, well there are millions of years?! Continue reading
A long time ago, even before dinosaurs roamed the Earth and were the first sharks that these extraterrestrial beings already inhabited the seas and oceans. They are the most ancient inhabitants of our planet . lived on Earth for another 500 to 700 million years ago.
This jellyfish is one of the most amazing, beautiful and mysterious sea creatures.
Jellyfish seem to be supernatural creatures, alien beings largely thanks to its strange forms and colors. The nature has created them according to his own, some incredible drawings: the body resembles an umbrella, or bell, sometimes the ball.
His name jellyfish has been because of the similarity with a wiggling hair-the legendary snakes of the Gorgon Medusa from Greek mythology. (Photo Animal Theory):
There are about 2000 different species of jellyfish. Some live in fresh water, others are found in seas and oceans. (Photo By The Tahoe Guy):
As already mentioned, jellyfish have lived on Earth for another 500 to 700 million years ago. This is a very long time. For example, the first dinosaurs appeared about 225 million years ago and the most ancient representatives of the sharks existed about 420-450 million years ago. (Photo Animal Theory):
The structure of a jellyfish is also incredibly: primerena they consist of 95% water, 3-4% — of salt and 1-2% — from protein. They have no heart, no eyes, no circulatory system or gills.
The Cassiopeia jellyfish, living mainly in the Mediterranean sea. (Photo Pietro Columba) Continue reading
1. What type of water body (pond) is better? Are a lot of options, from wooden or plastic reservoirs with plastic lining and finishing of concrete reservoirs with a tiled surface. Some owners of water bodies use dirt, they put it on the bottom of a wooden or concrete ponds to make the pond more organic. In terms of the reservoirs also differ greatly from each other, the volume ranges from 10 liters to several thousand.
The reservoirs (ponds) with fish
Let’s assume you have a plastic reservoir with capacity 200 to 250 litres or say, wooden with a plastic strip.
2. How to run the pond? Probably the pond was sold with the manual. Please read it carefully and follow all instructions. Perhaps you will read that you must add water conditioner to get rid of the chemicals that are added to tap water. Be patient. Fill the reservoir with running water, add the conditioner and wait at least three days prior to plant fish there.
At the same time you need floating food for goldfish, for example “TetraFin” fish food for small fish and “Tetra Pond Floating Food Sticks” for large. Owning a net (20 cm diameter) with a handle long enough that dottydo any point of the reservoir.
3. Choosing the right place. You can put the reservoir wherever you want, however, you should avoid places where a lot of leaf litter and organic fragments. As an alternative – you can close your pond from falling leaves through the screen. Continue reading