近二十年来,全世界渔船的总数增加了50%以上,捕捞工具和技术亦均有极大的改进,而渔业产量的增加,却不到10%。就我国情况来看,五十年代后期与初期相比,渔船吨位增长65%,马力增加5.6%,年产量增加2.3倍,平均每马力单产为2.3吨。1978—1980年,船只增加22%,马力增加32%,年产量下降12%,马力单产只 Over the past two decades, the total number of fishing vessels in the world has risen by more than 50%. Fishing tools and technologies have also been greatly improved, while the output of fisheries has increased by less than 10%. In the case of our country, the tonnage of fishing vessels increased by 65%, the horsepower increased by 5.6% and the annual output increased by 2.3 times compared with the initial period in the late fifties. The average per-hp output was 2.3 tons. From 1978 to 1980, vessels increased by 22%, horsepower increased by 32%, annual output decreased by 12%, horsepower only