Aquarium Fish Species - Ceratophyllum
Ceratophyllum (Ceratophyllaceae, cosmopolitan) Ceratophylls can be found all over the world, but only one species is common in aquariums. Ceratophyllum demersum The water sprite is found in Europe and Central America, though this temperate water plant can adjust to tropical aquariums. It is well suited to tanks with goldfish or garden ponds, where it can sometimes grow in profusion. It is easy to cultivate, although its stem breaks easily. It does not have any true roots and finds it difficult to establish itself in the substrate; it therefore has to be “wedged in” by rocks or branches, or float on the surface. It is easy to take cuttings from the main stem, or from side shoots. It is relatively indifferent to the hardness and pH of the water, but it does require strong lighting. Size: 30-40 cm. Cabomba (Cabombaceae, southern United States, South America) Some fish, such as South American Characins, take advantage of the fine foliage of the cabomba to lay their eggs, while other partially herbivorous fish graze on it. These plants need good lighting, water that is not too hard, and a more or less neutral pH. For reproduction take cuttings from the side shoots, or from the top. Cabomba aquatica If the light is weak, the water cabomba spreads out on the surface of the water. It grows quickly, unless the water is lacking in carbon dioxide; this means that you must avoid circulating it too vigorously. Size: 30-40 cm. Cabomba caroliniana More robust than its cousin, the fish grass or water shield can tolerate temperatures of 20 C but its soil must be fairly rich. The form of its leaves depends on the conditions under which it is cultivated. Size: 30-40 cm. Cabomba caroliniana Elodea and Egeria (Hydrocharitaceae, cosmopolitan) These are known as water pests, on account of their tendency to proliferate. Under an intense light they produce a great deal of oxygen. They put down roots but can also live afloat, preferably in hard, alkaline water. Elodea canadensis Originally from North America, Canadian pond weed has been introduced into temperate regions all over the world, although only the female has been present in Europe since the middle of the 19th century, and it can obviously only reproduce through cuttings. It is a plant for temperate aquariums or garden ponds, with an optimum temperature range of 15-20 C. Egeria densa (formerly Elodea densa) Both sexes of the dense elodea were, similarly, introduced into Europe, although it is highly unusual to find reproduction through flowering in an aquarium. It is suited to temperate aquariums, but can tolerate temperatures of up to 25 C. Size: 30-40 cm.
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