Abstract
Rasbora lateristriata is a freshwater fish that has small size and schooling fish in the shallow river. This fish is called Nyalian by the people in Bali. The population of Rasbora lateristriata has decreased at upstream in Sungi river that already lightly polluted. The genetic diversity of Rasbora lateristriata based on the Cytochrome Oxidase subunit I gene as a marker will be detected in the upstream, branch river, middle stream and downstream of the Sungi river. The method that used is the polymerase chain reaction (PCR) with two primers are Fish-BCL (forward) and Fish-BCH (reverse) were followed by sequencing using the method of Sanger sequencing to obtain its nucleotide sequences. Genetic diversity was analyzed using Mega 5.2 version. Nucleotide composition of Rasbora lateristriata are Thymine 29.8%, Cytosine 25.8 to 26.2%, Adenine 26.0% and Guanine 18.5-18.6% with total nucleotide are 633 to 682. The branch of the river, middle stream and downstream which the genetic diversity of locus COI experienced a change of nucleotide at the sixth base, Thymine (T) is replaced with Cytosine (C). Substitution Thymine to Cytosine is occurring on a polluted part of the river that may be caused by the parameters of the water quality.
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