摘要:

Creek chubs Semotilus atromaculatus from a metal-contaminated stream and a nearby clean stream in Richland County, Ohio, were studied to define the effects of chronic urban pollution on fecundity and tissue metal concentrations. Polluted waters had higher concentrations of total Cr, Cu, Fe, Ni, and Zn than control stream samples. Mean whole-body concentrations of Cr (5.3 μg/g dry weight) and Zn (166 μg/g) were significantly higher (P < 0.05) in fish from polluted sites than in fish from some control stream segments, but these differences were much less than differences in total metal concentrations at the respective sites, indicating little metal uptake by the fish, and probably low bioavailability of the metals. Fecundity of creek chubs was similar at polluted and control sites. Fecundity may not be a good gauge of toxicant stress, at least for creek chubs, but this study points up the need to distinguish between total metals and those that are in a biologically available form when field studies of pollution are conducted.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1986)115<346:FATCOC>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

We developed and evaluated the efficiency of a remotely operated pop net for sampling the entire fish assemblage associated with fish-attracting structures. The pop net collected an average of 99% of subadult and adult bluegills Lepomis macrochirus and largemouth bass Micropterus salmoides available to capture in pool tests conducted at 3–13°C and various light intensities. There was no evidence of species or size selectivity, and the fish showed little increase in gear avoidance when they were sampled at the pool attractor six times over 3 d. Capture efficiency of bluegills and white crappies Pomoxis annularis was 100% in 13 trials in a reservoir. The pop net was highly reliable in field use; most failures were due to disturbance of the firing mechanism by anglers.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1986)115<351:ABPNFA>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/1548-8659(1986)115<356:SHAPSI>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1984.10492811

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor