Crowding arrangement

A method for crowding an aquaculture tank of marine organism, comprises the steps:

• utilizing a crowding arrangement comprising:
• a sheet extending between a hub and an outer ring;
• wherein the sheet encircles the hub and the outer ring is in contact with an inner wall surface of the tank;
• wherein the hub is located at a center of the tank;
• wherein the sheet, the hub and the outer ring covers a horizontal cross-sectional area of the tank;
• a first wiper assembly and either a second wiper assembly or a fixed wall, extending substantially radially between the hub and the outer ring;
• wherein the first wiper assembly is moveably arranged with respect to the sheet;
• wherein the first wiper assembly comprises:
• a crossbar and a wiper;
• wherein the crossbar and the wiper are arranged in parallel and that a gap is formed therebetween to receive the sheet;
• wherein the wiper and the crossbar are fixedly attached to each other at one end;
• wherein the gap between the wiper and the crossbar are small enough to prevent a marine organism to pass through the gap;
• and
• rotating the first wiper assembly towards the second wiper assembly or the fixed wall to guide the marine organism towards an outlet in the tank positioned at the bottom of the tank, the outlet being positioned so that in all positions of the wiper assembly the outlet is arranged in the area between the second wiper assembly or the fixed wall, and the first wiper assembly.