论文部分内容阅读
利用渔获物统计法对我国鲟鱼主产区黑龙江、长江鲟类十几年的捕获物进行研究。研究发现:由于人为酷捕滥捞、环境污染,黑龙江鲟鱼种群结构严重失衡、资源急剧下降(452t,1987年,120t,1999年);由于长江葛洲坝截流,阻隔长江鲟鱼类的洄游,致使长江的中华鲟性比失调(:=1:0.39,1996年-1998年),雄性补充群体严重不足,繁殖种群退化,中华鲟岌岌可危。白鲟和达氏鲟现已濒临绝迹。本文叙述了我国鲟鱼的保护和利用现状及今后应采取的措施;并对我国鲟鱼利用途径进行了探讨。
The catches of more than ten years of sturgeons in Heilongjiang and Yangtze River Sturgeon, the main sturgeon producing areas, were studied using catches and statistic methods. The study found that due to man-made fishing and environmental pollution, the sturgeon population structure in Heilongjiang was seriously unbalanced and the resources dropped sharply (452t, 1987, 120t, 1999). Due to the closure of the Gezhouba Dam in the Yangtze River, migration of the sturgeon fishes in the Yangtze River was blocked. The ratio of Chinese sturgeon in the Yangtze River was significantly lower than that in the Yangtze River (: = 1: 0.39, 1996-1998). However, the male supplement population was seriously under-aged, the breeding population degenerated and the Chinese sturgeon was at risk. White sturgeon and Dart sturgeon are on the brink of extinction. This article describes the status of conservation and utilization of sturgeon in China and the measures to be taken in the future; and discusses the utilization of sturgeon in China.