In all actions under this chapter, unless the defendant or someone in the defendant’s behalf shall have given the undertaking prescribed in s. 780.09, the court or jury who shall try the same or make an assessment of damages therein shall find whether or not such debt or damages are due for or accrued or arose out of or upon any of the causes mentioned in s. 780.01, and specify such cause and the date when the same became due or accrued in the verdict or finding. If such court or jury shall find that such debt or damages are for any of the causes specified in s. 780.01 and that the defendant is liable to the plaintiff therefor then the court shall render judgment accordingly, and that the amount of such debt or damages so found, together with the costs, charges and disbursements, are a lien upon such ship, boat or vessel to the extent of the interest of the defendant therein at the time the same became due or accrued or at any time thereafter, and the execution issued thereon may, in addition to the directions contained in other executions against the property of a defendant, direct that such interest of the defendant in such ship, boat or vessel, its tackle, apparel and furniture be sold to satisfy such judgment, and the same shall be sold accordingly; but if the court or jury shall find that the amount due the plaintiff for such debt or damages is not for any of the causes mentioned in s. 780.01 or if the defendant shall have given such undertaking the plaintiff shall only be entitled to judgment as in other civil actions.