| dc.description.abstract | Dredge is cockle colector which mostly used by Rawameneng’s fishermen. Its working principle by pulled over to rake off sea floor. The row of theeth that placed in front of below dredge mouth will rake and throw cockles in to the net bag. The accuration of throwing direction will be depended by bent angle of the dredge teeth. This research done by two studies, determination for throwing direction uses dredge theeth that was working in laboratory and dredge test that was working in field. Determination of α throwing direction used dredge theeth which is bent β=0o, β=15o, β=30o, and β=45o. Test result shows that dredge theeth β=30o give throwing angle α = 35,95o, or higher than β=0o (α = 9,85o), β=15o (α = 19,65o) and β=45o (α = 19,65o). By those reasons bent angle sets β=30o because it has much better accuracy in throwing into net bag. Dredge test in the field proved that dredge with β=30o theeth contruction caught 5.785 cockles, they are 4.228 Anadara granosa and 321 Anadara antiquata. This result showed amount that 1,7 times bigger than β=0o, they are 3.360 cockles (1.454 Anadara granosa and 136 Anadara antiquata). | en |
