Type of feed fish are divided into four groups:
– benthos feeders — fish, feeding on small organisms living on the bottom or near the bottom (benthos), sturgeon, grayling, bream, ruff, etc
– planktology — fish feeding on organisms living suspended in the water column (plankton), Zope, sabrefish, bleak, verhovka, etc.
– mixed feeding — fish feeding on organisms such as benthos and plankton, — roach, bream, IDE, Dace, etc.;
predators — fish that feed on other fishes or animals of their own species — pike, pikeperch, perch, Chub, burbot, catfish, trout, salmon of the Danube. Continue reading
Mysterious beast Barracuda.
Many consider the Barracuda as dangerous as sharks, piranhas and eels. Fortunately, this fish species live exclusively in tropical and subtropical waters of the World ocean, therefore we encounter very rarely.
The most ominous feature of the Barracuda – powerful lower jaw, far coming from the top. Jaws equipped with fearsome teeth: a series of small, razor-sharp canines dot the jaw outside, and inside there are several large teeth like daggers. The largest Barracuda caught by the man, was a little more than two meters long, and weighed almost 50 kg!
The great Barracuda has a reputation as a voracious predator. All the sea creatures, inferior to her in size – fish, squid, large prawns and even other Barracuda can become its prey. Usually, these evil fish lie in wait for their prey in ambush among stones, rocks or in thickets of underwater vegetation. In addition, quite often they attack shoals of small fish, gathering in small groups. If Barracuda large size – it does not need a pack and prefer to hunt alone. Continue reading
Taking the decision to start an aquarium, it is very important to take care of is to populate the aquarium with compatible species of fish. Otherwise some fish will hunt for others or eat their food, while others will be constantly in danger. So the compatibility of aquarium fish is a very important factor that should take into account the novice aquarists.
It is known that in nature, the coexistence of different species is regulated in a natural way: for each other fish just will not be settling there. But in the aquarium by the will of man predatory and peaceful fish have to be “neighbors” that usually leads to problems: the strong eat the weak, and the number of inhabitants of the aquarium has been steadily declining.
However, not only in danger of eating some types of fish other lies the reason for the incompatibility aquarium fish among themselves. There are also problems related to the content of different species of fish in the aquarium associated with different needs for water parameters, the size of the available area, presence of aquatic plants, etc. Continue reading