Aquarium guide
Aquarium guide     

  
 
MOLLUSKS
 

MOLLUSKS

Their limp body is protected by a shell, which has two parts - these are the bivalves - or a single part - as in the case of :he gastropods.

MOLLUSKS

The bivalves half-open their shell - formed, as their name suggests, by two valves - to filter water. In this way they absorb oxygen and capture food particles, particularly vegetal plankton. Keeping them in an aquarium does not, therefore, pose any problems.

The gastropods, related to land snails, have a spiraled shell which varies in shape, according to the species. An organ in the mouth in the form of a grater, the radula, allows them to graze micro-algae on the decor, glass sides, or plants. This cleaning function constitutes their main attraction for aquarists. Do not, however, expect them to gobble up all your unwanted algae, as they play a more preventive role to restrict their untimely growth. They can sometimes attack the leaves of plants or eat a surplus of the food intended for fish. Some species are carnivorous.


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ПАЛЕРМО (Palermo) , город в Италии, на о. Сицилия, порт в Тирренском м., административный центр обл. Сицилия и пров. Палермо. 734 тыс. жителей (1991). Международный аэропорт. Машиностроение (включая судостроение, сельскохозяйственное, электротехническое), химическая, легкая, деревообрабатывающая, полиграфическая, пищевкусовая промышленность. Ежегодные средиземноморские ярмарки. Университет. Археологический национальный музей, Национальная галерея Сицилии, Епархиальный музей, Галерея современного искусства, Этнографический музей. Основан финикийцами. В 12-13 вв. резиденция королей Сицилийского королевства. Восстанием в Палермо (12 января 1848) началась Революция 1848-49 в Италии. Романские по