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Growing concern for many of the tropical anguillid species, particularly those inhabiting parts of the Western Central Pacific, was reflected in the assessments of species within this area.

There is relatively little information available on various aspects of the eel biology including species composition, geographic distribution, life history and migration in tropical waters.

Little effort has been made to examine the species diversity, geographic distribution, habitat ecology and life history of the anguillid eels in Malaysia and Indo-Pacific region. These results suggest that the catching methods for anguillid eels in the present study would be suitable for various growth and maturation stages. Furthermore, temperatures of these sites were lower than that in other sites.

In the present study, comprehensive research on species diversity and geographic distribution of the anguillid eel species of Peninsular Malaysia has been done by employing accurate methods using molecular genetic analysis after conducting morphological observations. bengalensis bengalensis ranged from 357 mm to 1295 mm and from 51.8 g to 4400 g, respectively (Table 1). marmorata were 904 mm and 2335 g, respectively (Fig. Anguilla bicolor bicolor was found in 12 out of 13 sites in Penang Island (Figs 2, 3). The lowest temperature was found in Titi Kerawang Waterfall ranging 23.6 to 24.2 °C and the second was Titi Serong at 25.8 °C in the midstream region of Pinang River (Table 2). Species composition of Anguilla bicolor bicolor and A.bengalensis bengalensis collected in the 13 sites in the Penang Island, Peninsular Malaysia. bicolor bicolor was collected in Hujung Rintis which is the estuarine part, while no A.

The other sites where the sample sizes were less than 20 also had similar tendencies in that the eel sizes were variable and the eels did not fall in the same size group in each location (Tables 3, 4). marmorata, were found to occur in the northwestern peninsular area. bicolor bicolor constituting 88.1% of the total eels, the second was A. marmorata was the least abundant at 0.2% (Table 1).

This study is the first and the comprehensive description of the species composition, diversity, distribution and habitat use among the anguillid eels in tropical waters, which has accurate and valid species identification. Comprehensive studies by Ege have discussed anguillid species diversity, geographic distribution and abundance in the world and have revealed that the highest diversity of Anguillidae occurs around Indonesian and Malaysian waters.

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