Tactile Preference of the Freshwater Shrimp Palaemon paucidens for Net Panels Made of Bio-Polyester (Biopole)

Abstract

The performance of bio-polyester (Biopole) as a net material for traps was investigated in a water tank experiment using the freshwater shrimp Palaemon paucidens. The numbers of shrimp that settled on net panels composed of different materials and placed side by side in pairs were measured. Net panel materials examined included bio-polyester, nylon-monofilament, nylon-multifilament and steel. A smooth surface bio-polyester without cracks was compared with a rough surface bio-polyester with many cracks caused by soiution. More shrimp settled on the bio-polyester panels with a smooth surface than the nylon-multifilament and steel net panels, but less than on the nylon-monofilament panels. When bio-polyester panels with many cracks were examined, fewer shrimp settled on the bio-polyester panels than on the two nylon panel types, but more than on the steel net panels. These results suggested that the texture changed the attractiveness of the bio-polyester to the shrimps.