Aquarium Fish Wholesale

The respiratory and circulatory system This system is highly distinctive. The blood loaded with carbon dioxide is pumped by the heart to the branchiae, where it is oxygenated. Nature has provided fish with eight branchiae (four on each side), each made up of two leaves. The total surface area of these essential organs, when spread out, would be nearly equal to that of the fish’s body. The vivid red color of the branchiae is due to their abundant irrigation of blood; a darker color is a symptom of a respiratory problem. The branchiae are fragile organs, susceptible to damage from suspended sediment or parasites, resulting in a reduced intake of oxygen, with all its unfortunate consequences. After traveling through the branchiae, the vivid red blood, rich in oxygen, irrigates the body, and the oxygen goes on to break down the foodstuffs in the organs. The fish in the Belontiid family, which live in water in which the oxygen is sometimes rarefied, have a special organ for trapping atmospheric oxygen. The digestive system This has no special characteristics, apart from the fact that the stomach can stretch to hold large prey, especially in carnivorous fish. This is where digestion starts, and it then continues in the intestine. With large prey the process can last several days, but in an aquarium, with artificial food, it will not take more than a few hours. The excretory system This allows undigested matter to be evacuated through the anus in the form of excrement, or feces. The urine is formed in the kidneys, situated under the spinal column; it is evacuated through the urinary pore. It is worth mentioning that fish also excrete nitrogenous substances via the branchiae. All excreted substances contain nitrogen and are toxic for animals, but in a well-balanced aquarium they are eventually converted into nitrates and thus cause no harm.
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