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The drastic changes in hydroelectric reservoir development created a completely new ecosystem that affects the river, particularly in the inundated area. In this study, five Neolissochilus soroides and Channa lucius were surgically implanted with a unique coded acoustic transmitter to observe the habitat utilisation and movement activity in Tembat Reservoir after the inundation process. All of the individuals were released into the transition zone of the reservoir and observed using passive and active acoustic tracking devices from April to December 2018. Kruskal- Walis test showed no significant difference between the average size of core area for N. soroides and C. lucius, x²(1) = 1.320, p = 0.251. The home range also showed a similar result for N. soroides and C. lucius where there was an insignificant difference, x²1) = 0.273, p = 0.602. However, duration wise, N. soroides spend more time in the transition zone, R1 (M = 2.71 hrs, SE = 0.38), and C. lucius in the riverine zone, R5 (M = 7.14 hrs, SE = 6.13) and R6 (M = 3.85 hours, SE = 6.36). From the active tracking survey, PCA identified three (62.32%) and four (71.19%) components with eigenvalues greater than 1 for N. soroides and C. lucius, respectively. Three most important habitat parameters for N. soroides were the size of river (r = 0.97), existence of canopy cover (r = 0.77), and substrate type (r = 0.79).While, for C. lucius were mesohabitat type (r = 0.79), distance to riffle (r = 0.97), existence of canopy cover (r = 0.90), and elevation (r = 0.90). A 24-hour movement frequency analysis for both species revealed two active hours of movement at dusk and dawn for both species. From the study, it is known that N. soroides and C. lucius respond differently towards the inundation of the reservoir. The findings in this study can be implemented for effective aquatic management and conservation plan to ensure sustainable dam development. [ABSTRACT FROM AUTHOR]

The length-weight relationship and condition factor of cyprinid fish, Neolissochilus soroides, from Sungai Tembat, Hulu Terengganu, Peninsular Malaysia were studied from March 2016 to May 2017. A total sample of 1505 with 17-61 cm TL and 70-2245 g in weight was examined. The values of constants 'a' and coefficient correlation 'b' were determined from the length and weight data which were transformed into the linear equation of log W = log a + b log TL. These parameters were then fitted to the parabolic equation, W=aLb. The growth exponents, that represented by 'b', for the fishes varied from 2.505 to 3.299. The overall LWR equation of N. soroides (W= 0.0396L2.619) showed negative allometric form of growth indicated by the growth coefficient (b < 3) and the measurement was significant and positively correlated between each other; r²> 0.8 at P< 0.001. It showed that their growth was still in the normal range for freshwater fish. Condition factor index, K>1 show the fish inhabiting Sg. Tembat were in a good condition. This information is crucial to plan a conservation strategy for this species in future. [ABSTRACT FROM AUTHOR]