厦门筼筜湖游泳生物资源状况

Necton Resources State of Yuan-dang Lake in Xiamen

2007年11月和2008年5月,对筼筜湖的游泳生物开展了2个季度的调查。结果显示:调查出现的游泳生物种类有69种。其中鱼类44种,虾类7种,蟹类14种,头足类3种,口足类1种;渔获量的优势种为远海梭子蟹和尼罗罗非鱼,渔获尾数优势种则以硬头鲻和远海梭子蟹为主。湖内刺网平均单位面积渔获量1.0069g/m2.h,单位面积渔获尾数0.0192 ind/m2.h.。排水口年平均资源指数为1043.317g/网.h,资源密度为148.883 ind/网.h。现存资源量为729.752kg,现存资源尾数为10.4168×104尾。调查结果表明,筼筜湖的游泳生物种类比2001年出现的60种和1992年的43种,分别增加15%和60.46%。表明筼筜湖的综合治理取得了明显的生态效果。

An investigation on necton of Yuan - dang lake was carried out in November, 2007 and in May, 2008. The results showed that there were 69 species of the necton, among them, there were 44 species of fish, 14 of crab, 7 of shrimp, 3 of cephalopod, and 1 of mantis shrimp, and that the dominant species of catch in weight were Portunus pelaglcus and Tilapia nilotica, and that the dominant species of catch in number were Mugil strongylocephalus and Portunus pelaglcus. Unit catch of gill net in the lake was 1. 0069g/m^2 · h, Unit catch in number was 0. 0192 ind/m^2 · h. Unit catch of net in the ouffall of lake was 1043. 317 g/net · h, and unit catch in number was 148. 883 ind/net · h. The estimating potential resources were 729. 752 kg, and the number of potential resources were 10. 4168 × 10^4 ind. The results showed that the species were 60 in 2001 and 43 in 1992, respectively increased by 15% and 60. 46%. It indicated that ecological environment of Yuan - dang lake has been made by further comprehensive control and management.