变水层大网目拖网试验与推广

报道了 2 86 .0 0m× 14 4.4 0m( 99.50m)变水层大网目拖网生产和网模试验情况 ,对网目尺寸、网口周长、配纲系数、网位调整、拖速与捕捞对象等方面进行适渔性分析 ,并分析了该网具的捕捞效果。结果表明 ,变水层大网目拖网具有阻力小、网型轻巧、网口扩张性能良好、网口高、破网率低等优点。试验船与对比船相比 ,产量增长 2 4 .53% ,产值增长 2 8.35% ,日创值增长 2 3.83% ,平均网产增长 19.2 3%。生产对比期间 ,试验船产量 131.5t ,产值 2 7.6 2万元 ,日创值 0 .95万元 ,平均网产 1.55t ,分别比对比船增长 2 4 .53%、2 8.35%、2 3.83%和 19.2 3%。该网型已在茂名市大面积推广 ,推广面达 10 0 %。

Generalization and Trial of Multi-layer Large Mesh Trawl

The paper presents operation and model trail of multi-layer large mesh trawl in size of 286.00 m 144.40 m(99.50 m). The catchablity of mesh size, length of trawl mouth, rigging rate of ropes, adjustment of net position, towing speed and fishing target was analyzed as well as fishing effect. The results of trail indicate that the catch of trail boat amounted to 131.5 t with production value 276 200 RMB, production value per day 9 500 RMB and average catch per net 1.55 t. They increased by 24.53%, 28.35%, 23 83% and 19.23% respectively with comparison to non-trail boat. The type of net structure has been wildly popularized in Maoming city and covering rate is reported to be 100%.