Abstract:
A total of 3675 individuals of aquatic insects from 40 families belonging to eight
orders have been recorded from lower stream (LS), middle stream (MS) and upper
stream (US) of Sungai Sekayu headstream. There were eight common orders of
aquatic insects recorded which were Trichoptera (31 %), Ephemeroptera (25%),
Plecoptera (16%), Odonata (14%), Hemiptera (8%), Coleoptera (4%), Diptera (2%)
and Megaloptera (0.3%). In term of family, Perlidae (Order Plecoptera) was the most
dominant family as 578 individuals were successfully collected and abundantly found
at all sites. However. Trichoptera was identified as the most dominant order in all
sampling sites while Sialidae (order Megaloptera) was recorded as rare distribution.
