Larval Fish Drift in a Large River with a Comparison of Sampling Methods
作者:
WilliamF. Gale,
HaroldW. Mohr,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1978)
卷期:
Volume 107,
issue 1
页码: 46-55
ISSN:0002-8487
年代: 1978
DOI:10.1577/1548-8659(1978)107<46:LFDIAL>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Larval fish drift in the rocky-bottomed Susquehanna River (northeastern Pennsylvania) was investigated during 1974-1975. Near SSES (Susquehanna Steam Electric Station) at least 18 species of drifting larvae were collected by nets mounted on a stationary boat or by pumping. Maximum densities of 15.4 and 27.1 larvae/10 m3were found in June 1974 and 1975, respectively. Quillback, Carpiodes cyprinus (56%), minnows (25%), and carp, Cyprinus carpio (14% of the total) were the most abundant larvae caught in 1974 by pumping. The few larvae that drifted during the day were mostly near the bottom. Large numbers of quillback, white sucker (Catostomus commersoni), shorthead redhorse (Moxostoma macrolepidotum), and tessellated darter (Etheostoma olmstedi) larvae drifted near the river surface at night. Drift was maximum at about 2400 h. Overall, the day/night drift ratio was 1/3.8.
点击下载:
PDF (712KB)
返 回