US cruiseship owner Lindblad Expeditions Holdings has posted a bigger loss for the fourth quarter despite increasing revenue.

The company said the net deficit was $8.4m, from $0.4m in 2015.

This was partly due to a $3m tax benefit in 2015 and $1.2m of other costs primarily related to the retirement of one of its vessels.

Tour revenue came in at $56.1m, up 21%.

Annual