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A total of 408, 54 and one specimens were identified belonging to Anguilla bicolor bicolor, A. Such tendency was also observed in Titi Kerawang Waterfall in the case of A.

Thus, eel biology research in Malaysia could provide details about their species diversity, evolutionary pathway and life history. bengalensis bengalensis was first recorded in Malaysian waters.

According to previous studies, tropical eel species Anguilla bicolor bicolor, A. marmorata have been found in Peninsular Malaysia had indicated that a tropical mottled eel Anguilla marmorata had been found in Peninsular Malaysia but after reexamination of a number of key characteristics of the preserved specimen, the eel was identified as A. Species misidentification in previous studies may have been due to insufficient data from analysis using morphological characteristics.

Comprehensive research on the species composition, distribution and habitat use among tropical anguillid eels in the Peninsular Malaysia were conducted for four years. The habitat preference might be different between sites due to inter-species interactions and intra-specific plasticity to local environmental conditions.

A total of 463 specimens were collected in the northwestern peninsular area. bicolor bicolor constituting of 88.1% of the total eels, the second one was A. These results suggest that habitat use in the tropical anguillid eels might be more influenced by ambient environmental factors, such as salinity, temperature, elevation, river size and carrying capacity, than ecological competition, such as interspecific competition..

Along with the mysteries of their ecology, freshwater eels have fascinated biologists for centuries.

However, information concerning species diversity, geographic distribution, and life histories of the tropical anguillid eels in the Indo-Pacific region are highly limited. bicolor bicolor was widely distributed from upstream to downstream areas of the rivers. bengalensis bengalensis preferred to reside from the upstream to midstream areas with no tidal zones, cooler water temperatures and higher elevation areas.According to past studies, tropical eel species Anguilla bicolor bicolor, A. bengalensis bengalensis have been found in Peninsular Malaysia. bengalensis bengalensis was most abundant in Titi Kerawang Waterfall which is the uppermost part of the Pinang River (5; Table 4, Fig. Such a trend was found in Titi Serong as well which lies upstream of Titi Teras River (10; Table 4, Fig. Furthermore, the midstream of Pinang River where one A. 3), have higher elevations than other sites (Table 2).However, these studies have mainly focused on fish records, re-examination and identification of the anguillid eels. bengalensis bengalensis were found to vary widely from Stage I (primary stage) to Stage V (final stage for spawning) (Table 1). bengalensis bengalensis in many sites (Tables 3, 4, Fig. The area of Titi Kerawang Waterfall had the highest elevation ranging 174–217 m; the second highest elevation was in Titi Serong being 50–75 m and the third highest was in the area midstream of Pinang River being 36–38 m (Table 2).The drastic decline in recruitment of temperate anguillid eel species (Anguilla anguilla in Europe; A. japonica in East Asia) in recent times has caused serious problems for maintaining sustainable levels of adult organisms.Tropical eels are becoming the major target species for satisfying the high demand for eel products.Hence, the identification of eels at the species level using solely visual observation has been known to be difficult because of their similarities and overlapping morphological characteristics, particularly of tropical Anguillidae have reported the first occurrence of A.

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