conda install -c bioconda nanostat

NanoStat [-h] [-v] [-o OUTDIR] [-p PREFIX] [-t THREADS]
                (--fastq FASTQ | --summary SUMMARY | --bam BAM)

Get statistics of Oxford Nanopore read dataset.

Mandatory one of the following data sources:
--fastq FASTQ         Data is in fastq format.
--summary SUMMARY     Data is a summary file generated by albacore.
--bam BAM             Data as a sorted bam file.

Optional arguments:
  -h, --help            show this help message and exit
  -v, --version         Print version and exit.
  -o, --outdir OUTDIR   Specify directory in which output has to be created.
  -p, --prefix PREFIX   Specify an optional prefix to be used for the output files.
  -t, --threads THREADS Set the allowed number of threads to be used by the script

Number of reads:	408254
Total bases:	3508315665
Median read length:	5168.0
Mean read length:	8593.46
Readlength N50:	39346

Top 5 read lengths and their average basecall quality score:
Length: 255821bp	Q: 6.84
Length: 254573bp	Q: 7.09
Length: 253711bp	Q: 6.96
Length: 245784bp	Q: 6.98
Length: 245776bp	Q: 7.06

Top 5 average basecall quality scores and their read lengths:
Length: 407bp	Q: 16.22
Length: 880bp	Q: 16.18
Length: 729bp	Q: 16.12
Length: 1057bp	Q: 16.08
Length: 841bp	Q: 15.84

Number of reads and fraction above quality cutoffs:
Q5:	406428	99.55%
Q10:	305509	74.83%
Q15:	124	0.03%
Q20:	0	0.0%