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Pergau Dam as the largest hydroelectrical generation station in Peninsular Malaysia within a mountainous region; is supplied by many flowing river as its intakes. Previous researches within Pergau area mostly focused on biodiversity while this research was to carry out baseline investigation on the minerals present in the intakes sediment of Pergau Dam through surface sampling. Through stereoscopic observation, assemblages of quartz, plagioclase, feldspar, muscovite, and biotite minerals in sediments implies a granitoid source rock. By computing X-ray Fluorescence (XRF) chemical compositional data of sediments into chemical weathering indices, overall weathering condition of Pergau Dam intakes area are unweathered to low chemical weathering intensity. Through Combination of XRF data and X-ray Diffraction (XRD) patterns of mineral phases, detailed mineralogy of plagioclases, K-feldspars, sericites, chlorites and accessory minerals such as epidotes, zircon and monazite were identified. Mineral assemblage and Streckeisen Diagram plots indicate the granitoid source rocks of the sediments are quartz monzorite and quartz monzodiorite.

Some biological aspects of the copepods Apocyclops dengizicus and Mesocyclops isabellae were studied at a pool in Garmet-Ali during the period between August 1998 and July 1999. The laboratory sex ratio was in favour of the females: 3.6:1 and 2.06:1 in the two species respectively. The females of the two species showed faster growth during the copepodites IV, V and the adult. The males reached the adult stage at a shorter time than the females. All stages of life of A. dengizicus appeared in August 1998 and then disappeared. In February 1999 a few copepodites and adults were present, peaked in March and disappeared during April. M. isabellae appeared during August 1998 - December 1998, then disappeared and reappeared in April 1999. It is suggested that predation and cannibalism may be the causes of diapause in the two species.