The ocean abounds with excellent swimmers who, in the words of the famous German nineteenth-century biologist Ernest Haeckel, “free to find their own way”. They can resist the strong current of water and to choose their own way, different from the animals of the plankton. The combination of these actively swimming animals E. Haeckel called the nekton, which means “floating”. Technically, the nekton are aquatic snakes, birds, and animals, but here we will talk only about the two groups of nektonic organisms — the fish and cephalopod molluscs.
Important nektonic animals adaptations to life in the water column of the ocean, according to Professor Yuri Aleev are maintaining the body in a suspended state, creating a driving force, reducing the resistance of the counter flow of water, control the movement of the body, as well as in the ability to disguise and protection. Continue reading
Before you start seahorses, carefully familiarize yourself with the basic rules of care.
Often aquarists are looking for a small ecosystem of some unusual animals. We like to add to their aquariums animals with vivid coloration, unusual behavior, or freakish body shape. No animals do not fit this description better than seahorses. Seahorses – the holders of the truly mythical body shape: consobrina head is wonderfully combined with the reinforced, curved body. These are truly fantastic creatures are very interesting to watch, but if you prepare properly in advance, then keep them in an aquarium is no more difficult than any other fish. Today I will try to dispel some myths about the seahorses, common among aquarists, as well as talk about the basic requirements for creating a suitable for seahorses environment, so that even the beginners had the opportunity to watch these amazingly beautiful animals at home. Continue reading
The owners of the seas and oceans, rivers and lakes, and all water resources of our planet – fish. Due to the fact that they have Zebra, they can breathe oxygen that is dissolved in water. Fish are cold-blooded animals with simple nervous and circulatory system. They all organs and body structure adapted for life in water. They say that fish are dumb and can’t talk, but this is a misconception. Fish still emit very weak sounds. In the course of evolution more and more advanced above-ground animals went from the fish. Fish went from amphibians, which later evolved reptiles, and then mammals. Fish occupy an important trophic value in the water. They feed on small insects and other worms, and fish in turn feed on other higher animals. In the seas and oceans fish often move in large shoals which can be several thousands.
In the last century greatly increased fisheries and oceans and seas disappeared many species of fish. But they are able to quickly recover their population if they don’t catch. Continue reading