GulfMark Offshore Inc. announced results for the fourth quarter, reporting an 8% decline in earnings despite higher revenue. The Texas-based company reported that net income for the fourth quarter was $8.18 million or $0.39 per share, which declined from $8.90 million or $0.44 per share in the prior year quarter. On average, six analysts polled by First Call/Thomson Financial had estimated fourth quarter earnings of $0.45 per share. The fourth quarter results of the prior year included an income tax benefit of $4.8 million or $0.24 per share on release of deferred tax liabilities related to a tax audit. Income from continuing operations before tax for the quarter was $9.32 million, an increase from $4.08 million in the previous year quarter.