article: The choice of fish
For those approaching for the first time to the wonderful world of aquarium, the fish is not easy to choose to buy in specific stores. But just follow a few rules for orientation. Before the final choice of species, the aquarist must decide if he wants to keep fish "of cold water or tropical, freshwater and marine." For cold-water fish, the choice is rather limited, all goldfish are derived from a single species, Carassius auraturs, but the beginner must choose between a few varieties, such as a single queue, as the common red fish, fish much more durable and less demanding of the two-tailed variety. So with the experience, then you can move with greater confidence to own other varieties of goldfish. For tropical freshwater fish, the number of species available is several hundreds. At this point you can choose fish that occupy all levels of the aquarium, that is, dividing the space between the liquid surface species, the middle zone and the bottom. Buy fish that are not too large, and calculate the time of the subsequent growth of the fish. It is advisable to begin to enter the aquarium fish mixed, but people already think of wanting a single species is something very nice, like having only characins, Barbi, danio, catfish or even living on the bottom. Some people choose to own livebearers, but their high fertility can create problems causing undesired intersections. An example of great fertility are the Guppy fish or one million, there are several varieties typical shape of the tail and bright colors. The tropical marine fish, as well as having bright colors, they also kind of surface, middle and bottom waters. The main problem presented by the marine fish is their aggressiveness, often to the present members of the same species. At this point you should not take more than one of each species unless there is sure to have a real pair of fish, ie the male and female. Below, find some tips on how to choose a single fish in an aquarium shop. Consider in particular the state of health of the fish. The fish to be purchased must be full of life and active in the bathtub, make exceptions to the nocturnal species, which remain motionless in the tub when it is illuminated. The body of the fish should be firm, not the belly cord or dorsal surface must be "a knife". The color should be bright and clear, without opacity, discoloration or dark spots, if the fish has patches features such spots must be sharply defined color. The fins should be erect, not leaning to the body, but remember that some marine fish holding their fins almost always close to the body and bend only occasionally. Although some marine fish are by their constitution without ventral fins, the fish fresh water are always provided and those who lack them will not develop. It is not advisable to buy fish with wounds or obvious signs of disease. Always ask the seller if the fish is suitable for our aquarium. Identify a fish wrapped raises problems, especially if you use the common names, invented a name often used to buy a fish faster than a scientific name. And 'good buy fish for his true scientific name, referring to reliable texts of books or the Internet. Finally buy fish that we are young and always ask for the dimension that takes an adult.