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Abstrak Genetic Diagnosis and Reproductive Biology of Translocated Mystacoleucus Padangensis in the Toba Lake, North Sumatra

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,Arif Wibowo,Siswanta Kaban,Vipen Adiansyah,

After  Mystacoleucus. Padangensis has been introduced to Toba Lake, North Sumatra, the status of M. padangensis  stocks  and their  biological  properties  is  unknown.  In  this study, we examine the genetic patterns of the M. padangensis in Toba Lake, North Sumatra Province.  Employing  the  cytochrome  c  oxidase subunit I (COI) gene of the mtDNA, we profile the genetic variation within M. padangensis in Toba Lake. We also analyzed reproductive characteristic and commercial catches of M. padangensis. The result shown M. padangensis is a synonim for M. marginatus, in total, 1 polymorphic sites (represent singleton dimensions) was identified  and  phylogenetic reconstruction reveal low levels of genetic diversity with no clear pattern of haplotype–partitioning. Nucleotide diversity analysis infer the present of two lineages. The Ne value of M. padangensis (1,936 to 3,878), the  population has not  experienced  population  growth/expansion  as  expected  and  the total production of M. padangensis in Toba Lake of the year for 2013 has ranged between 3347,05 – 6694,1 ton. M. padangensis in the Toba Lake share similar life history traits include maximum body size, longevity, age at maturity, and fecundity (the number of eggs produced). M. padangensis is categorized as the opportunistic strategy consisted of fishes with short generation time, low batch fecundity, and low investment per offspring. This life history traits approach of M. padangensis are important for guide fisheries management for its sustainability. More over the information can be use as pilot data and apply it to data–poor species.