Aquarium guide
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Planorbis
 

Planorbis

These are water snails with a flattened shell. Their orange-red body contains plenty of red globules to establish a high oxygen concentration, as they live in environments lacking in oxygen and breathe through their lungs, sometimes rising to the water surface. They graze on both short and filamentous green algae, whose growth they help to restrict. Size: 3-4 cm.

Planorbis

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ЛЕ ШАПЕЛЬЕ ЗАКОН , принят французским Учредительным собранием 14.6.1791 (предложен адвокатом И. Р. Ле Шапелье, Le Chapelier). Запрещал стачки и организации рабочих. Запрет стачек отменен в 1864, в 1884 разрешены профсоюзы.