水生生物学报2012，Vol.36Issue(2)：276-283,8.DOI:10.3724/SP.J.1035.2012.00276
太湖新银鱼移植对(鳖)早期摄食和生长的影响
THE INFLUENCES TO TRANSPLANTATION OF ICEFISH (NEOSALANX TAIHUENSIS CHEN) ON EARLY-LIFE FEEDING AND GROWTH OF HEMICULTER LEUCISCULUS BASILEWSKY
摘要
Abstract
Neosalanx taihuensis Chen is an important zooplanktivorous commercial fish, which was widely introduced into Chinese freshwaters. Transplantation of this species has induced decline and even extinction of native fish species in some waters. In this study, impacts of N. Taihuensis transplantation on early growth and feeding of an indigenous zooplanktivorous fish Hemiculter leucisculus Basilewsky were investigated by comparing the juveniles of the latter in two reservoirs in the middle reach of the Yangtze River. Huangshi Reservoir (HSR) and Mengquan Reservoir (MQR) are geographically proximate and display similar nutrient regimes and native fish faunas. The major difference between the two water is that N. Taihuensis has been transplanted in HSR but not in MQR. A total of 157 juvenile H. Leucisculus was collected in late July and middle August in both reservoirs. The juveniles collected in late July aged from 14 to 23 days, and were similar in growth rate between the two waters. The juveniles collected in middle August aged from 20 to 49 days. Growth rate of juveniles in HSR was significantly smaller than those in MQR. Otolith growth trajectories showed that incremental width was not significantly different between the two reservoirs until the age of 25 days but narrower for juveniles in HSR than those in MQR after that. Diet analysis showed that food compositions of the juveniles younger than 25 days were similar between the two waters, composing mainly Rotifera, small-sized Cladocera and Cyclopoida. For juveniles older than 25 days, food compositions in HSR were similar to the younger juveniles, while the food com positions in MQR changed to large-sized Cladocera, insects, eggs and fish larvae. Spawning season of N. Taihuensis is earlier than H. Leucisculus in the middle reach of Yangtze River, and diet competition between the two species may oc cur after the later shifts from feeding on small-sized to large-sized zooplanktons. In HSR, N. Taihuensis may induce the shortage of large-sized zooplanktons. As there was no enough large-sized zooplankton available to the juvenile H. Leu cisculus older than 25 days, they could only keep feeding on small-sized, which resulted in stunted growth of H. Leu cisculus juveniles older than 25 days compared to those in MQR.关键词
太湖新银鱼/移植/(鳖)/耳石日轮/早期生长/摄食Key words
Neosalanx taihuensis Chen/Transplantation/Hemiculter leucisculus Basilewsky/Otolith increment/Early-life growth/Diet composition分类
生物科学引用本文复制引用
王星璐,向建国,刘家寿,柳明,吴朗,谢松光..太湖新银鱼移植对(鳖)早期摄食和生长的影响[J].水生生物学报,2012,36(2):276-283,8.基金项目
国家重点基础研究发展规划973项目(2009CB119200) （2009CB119200）
国家自然科学基金项目(30771642) （30771642）
中国科学院“百人计划”择优支持项目 （）
