嵊泗人工鱼礁建设初期效果评价

基于2004年渔业资源的本底调查和2005年四个季度的跟踪调查结果，对嵊泗人工鱼礁一期工程的建设效应进行了初步评估，得到如下结果：（1）投礁后，礁区渔业资源生物量的相对变化率呈现上升趋势，平均增幅达75％，到了秋季生产力达到2004年同期的4倍多，而对照区的资源量则以36％的平均幅度减小；（2）投礁前，各个多样性指数相差不多，投礁后，鱼礁区的多样性值逐渐赶上并超过对照区，平均高出25％左右；（3）投礁前后，对照区的经济种种类数维持在10种左右，而鱼礁区随着礁体的投放，经济种增加，多达25种。结果表明，鱼礁投放后，鱼礁区生产力得到了提高，群落结构也得以明显改善，人工鱼礁的经济、生态效应已有良好的初步体现。

Preliminary evaluation on effects of artificial reef project in Shengsi

The biomass variation compared to background investigation,fisheries species diversity and composition of economic species between artificial reef(ARs) site and reference site were analysied based on the data from 5 surveys carried out in 2004 and 2005 respectively.Preliminary evaluation on artificial reef project in its No.1 step in Shengsi shows that:(1) After the deployment of ARs in reef area,its resources enhanced gradually by 75% in average while reference site came out in a opposite variation by 36% in average;(2)The species diversity of fishery resources remains almost the same between ARs site and reference site before AR were set,but increased gradually after ARs were deployed.During the other 3 surveys,the diversity indexes of ARs site have exceeded those in reference site by 25% in each season;(3) In the same season,the number of economic species remains about 10 before and after construction of ARs in reference site,while in ARs site,the situation is quite different,it increased a lot,even became 2 times as many as in reference site.It is concluded from those results that the fishery productivity in ARs site has improved a lot compared to reference site in the same time,and community structural has been improved too.The economic and ecological effects of artificial reef have been proved to be good in its preliminary step.