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Sea catfishes belong to the family Tachysuridae (Ariidae) and Plotosidae. Total 8 genera and 77 species are recorded in the family Ariidae of which 60 species of Arius spp. from Arabian Sea and Bay of Bengal. Four genera viz Arius/Tachysurus (Many species), Batrachocephalus (single sps.), Ancharius (two sps.) and Osteogenciousus (Single sps.) are known to occur in the western Indian Ocean.They inhabit marine and estuarine habitat and characterized by the presence of barbells, lack of true scales and strong spine in front of the caudal fin.Some aspects of biology and behaviour such as low...

Passive solar heating is defined as using solar energy incident on windows, skylights, greenhouses, clerestories, mass walls, and thermosyphoning collectors in order to provide heating for a house. Generally such solar collection occurs passively, without the extensive use of pumps or fans typically used in active solar collector systems. However, the distribution of the energy collected sometimes uses small fans to redistribute the energy throughout the house. Because heating is needed only over the colder part of the year (September to March), passive solar design must also eliminate...