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小银鱼作为一种小型经济鱼类,是我国传统的出口水产品之一。1993年,河南省南召县鸭河口水库移植太湖小银鱼卵50万粒,并于1995年首次成功捕捞商品鱼37.8吨,收入100多万元。但以后的10余年间,产量多时达187吨多,少时仅3吨,有些年份竟没有产量(逐年的产量见下图),什么原因导致鸭河口水库小银鱼产量产生如此大的波动?笔者结合在鸭河口水库从事银鱼研究、捕捞工作的实际经验,分析如下:
As a small economic fish, silverfish is one of China’s traditional export aquatic products. In 1993, Nanhe County Duck River Estuary Reservoir in Henan Province transplanted 50000 small silver fish eggs in Taihu Lake, and in 1995 for the first time successfully caught 37.8 tons of commercial fish, more than 100 million income. However, over the next 10 years, the output of up to 187 tons more than a little while only 3 tons, some years actually no production (annual output see below), what causes the production of duckweed small silverfish have such a big fluctuation? Combined with the duck mouth estuary in silverfish research, fishing experience, the actual experience is as follows: