I downloaded the SRA file from NCBI for my organism of interest. It is Illumina sequenced paired end RNA data. Normally to create an assembly forward and reverse reads are required by Trinity. However the downloaded file has no separate fprward and reverse reads. It appears to be a merged file. The _1 and _2 suffixes suggest that.
I wonder how can I split the forward and reverse reads if it is merged. Is there any other way to get such data.