Phytoplankton Community Structure And Coastal Water Quality Characteristics Of Manjung, Perak And Penang National Park, Penang

This study was carried out to determine the phytoplankton community structure and coastal water quality characteristics of Manjung, Perak and Penang National Park (PNP), Penang and to investigate the relationship between phytoplankton community and environmental parameters of the study areas. Five sampling stations adjacent to a thermal coastal power plant station (Sultan Azlan Shah Power Station) in Manjung and eight sampling stations surrounding the PNP were selected in this study. Collection of phytoplankton and water samples and measurement in-situ water quality parameters were done monthly from November 2009 to October 2010 during neap tide. A total of 101 phytoplankton species (36 genera) were identified in Manjung whereas a total of 71 species (33 genera) were identified in PNP. Bacillariophyta was the most common phytoplankton group found in Manjung (96.94%) and in PNP (95.63%), followed by Dinophyta (Manjung: 0.59%; PNP: 3.74%), Cyanophyta (Manjung: 0.32%; PNP: 0.57%) and Chlorophyta (Manjung: 2.15%; PNP: 0.06%). Odontella sinensis dominated MJ2 (near the inlet point of coastal power station; ISI: 6.28), MJ3 (near the outlet point of coastal power station; ISI: 5.18) and MJ4 (near the ash pond of coastal power station; ISI: 6.91) whereas MJ1 (reference site; ISI: 4.54) and MJ5 (near the mangrove areas; ISI: 6.90) were dominated by Pseudonitzschia heimii and Chaetoceros curvisetus respectively in Manjung

Population Dynamics of Tinfoil Barb, Barbonymus schwanenfeldii (Bleeker, 1853) in Pedu Reservoir, Kedah

The physico-chemical and biological parameters, species composition and population dynamic of dominant fish species were conducted in Pedu Reservoir in Kedah. The reservoir is considered safe from human activities, although the level of ammonia concentration (3.84 ± 2.65 mg/L) was exceeded the class recommended in Malaysia. 82.94% of fish families were contributed by Cyprinidae, 11.04% of Notopteridae, 3.01% of Bagridae and 2.51% for others. Twenty-four fish species were recorded in the reservoir and were dominated by Barbonymus schwanenfeldii (38.9%), followed by Oxygaster anomalura (12.4%) and Notopterus notopterus (11.0%). The length-weight relationships of B. schwanenfeldii was an isometric (b = 2.992) form with Kn ranging between 0.75 and 1.01. This fish could attain L? = 30.95 cm at growth rate of K = 0.66 yr-1, given the growth performance index (Ø’) of 2.801 that was represented from two cohorts occurred in August and February, respectively. The cohorts were strongly correlated to rainfall distribution in the area. The total mortality coefficient (Z) was 2.01 and natural mortality coefficient (M) was 1.37 yr-1 given the fishing mortality coefficient (F) and exploitation rate (E) was at 0.64 and 0.32 yr-1, respectively. The exploitation rate of 0.32 yr-1 was lower than the 75% of B’/R (E 0.1 = 0.41)  or optimum Y’/R (Emax = 0.53) indicating the yield per recruit of B. schwanenfeldii could be increased slightly by increasing the E. Keywords:  Barbonymus schwanenfeldii, length frequency, population parameters, management, Pedu Reservoir; Keda