Diversity and community composition of fishes in the Pusu River Gombak, Malaysia

The Pusu River has been receiving increased pollution loads because of a significant amount of land-clearing activities for development projects. A total of 113 numbers of fishes belonging to six species under six families were recorded from Pusu River throughout the study period (November 2014–March 2015). The most dominant species were Barbonymus schwanenfeldii (38.9%) followed by Oreochromis mossambica (36.28%) under families Cyprinidae and Cichlidae, respectively. Similarly, the species Hypostomus plecostomus (10.62%), Channa striatus (6.19%), Notopterus notopterus (4.42%), Pristolepis fasciata (3.54%) under the family Loricariidae, Channidae, Notopteridae, and Pristolepididae were constituted of the total fish catch, respectively. A greater abundance (56.64%) of fish community was observed at station 3 compared to the other stations. This is a deeper pool area located near the rainforest area with less turbid water compared to the other stations. Second highest abundance (14.16%) was observed at station 2, while station 6 has shown the lowest abundance (2.65%). Overall Shannon diversity value (H0 ¼ 1.399) indicates that Sg. Pusu, Gombak, is not highly diverse with the tropical fish species. The study suggests that a long-term continuous monitoring of water quality and fish diversity is needed to study for sustainable development of fishes in this fascinating tropical river (Sg.) Pusu

Design A Simple Solar Tracker For Hybrid Power Supply

This paper presents a smart power supply by using solar energy as the sources.It reduces the use of fuel in order to achieve maximize generation of electricity (during day time).The project equipped with solar tracker device which is absorbs the ultraviolet (UV) from the sun in maximum condition.The tracker operates with dual axis rotation where it can be rotating with 360° or which is 180° vertical/horizontals.This circuit is activated when light dependent resistor (LDR) detecting the light where four sensors are placed at east,west,north and south position.The solar panel is embedded with gear system to control the speed of the tracker and also obtain full charge of the 12V rechargeable lead acid battery