Madeline G. Tomczak, Robin L. DeBruyne, Brian A. Schmidt, Dustin A. Bowser, Jason L. Fischer, Gregory W. Kennedy, Nicole R. King, Christine M. Mayer, E. Roseman
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引用次数: 0
Abstract
Assessment of egg deposition is widely used to provide an index of spawning efforts for lithophilic spawning fishes. However, little is known about the collection efficacy and bias of fish egg collection methods. We conducted a two-phased study consisting of a simulated-river flume study (two-part design), and a field study (an egg drift comparison with capture on mats) to assess egg collection methods and evaluate egg retention and capture on egg mats. Lake whitefish Coregonus clupeaformis egg retention on seeded mats decreased with increasing velocity and walleye Sander vitreus egg retention was variable as velocity increased. Fewer lake whitefish eggs were collected on egg mats when limestone reef rock was present in the flume study during the simulated spawned trials, but the inverse was true for walleye. Similarly, during field collections more lake whitefish eggs were collected in benthic D-shaped frame (D-frame) drift nets set near a known spawning reef compared to egg mats set on the reef, indicating lake whitefish eggs were drifting downstream along the river bottom. In contrast, fewer walleye eggs were observed in D-frame drift nets compared to number of eggs captured on the egg mats. Therefore, egg mats are an informative tool for evaluating walleye egg deposition in an immediate area but may underestimate egg deposition of lake whitefish, especially in lotic systems. Compared to other egg collection methods in the current literature, our study indicates that egg mats are useful for assessing egg deposition by lithophilic spawning fishes, but that the collection and retention efficacy and bias of this gear may vary between species and habitat types.
鱼卵沉积评估被广泛用于提供嗜石产卵鱼类的产卵指数。然而,人们对鱼卵收集方法的收集效果和偏差知之甚少。我们分两个阶段进行了一项研究,包括一项模拟河流水槽研究(两部分设计)和一项实地研究(鱼卵漂流与鱼卵垫捕获比较),以评估鱼卵收集方法,并评价鱼卵保留和鱼卵垫捕获情况。种垫上的湖白鲑(Coregonus clupeaformis)卵存留率随着流速的增加而降低,而马口铁(Sander vitreus)卵存留率则随着流速的增加而变化。在模拟产卵试验期间,当水槽研究中存在石灰岩礁石时,在卵垫上收集到的湖白鲑鱼卵较少,但马口铁鱼的情况正好相反。同样,在野外采集过程中,在已知产卵礁附近设置的底栖 D 形框(D 框)流网与在礁石上设置的卵垫相比,采集到的湖白鲑卵更多,这表明湖白鲑卵沿着河底向下游漂流。相反,与卵垫上捕获的卵数量相比,在 D 形框流网中观察到的马口鱼卵数量较少。因此,卵垫是评估附近区域马口鱼卵沉积情况的一种信息工具,但可能会低估湖白鲑卵的沉积情况,尤其是在地段系统中。与目前文献中的其他卵收集方法相比,我们的研究表明,卵垫有助于评估嗜石性产卵鱼类的卵沉积情况,但这种工具的收集和保留效果以及偏差可能因物种和生境类型而异。
期刊介绍:
Journal of Fish and Wildlife Management encourages submission of original, high quality, English-language scientific papers on the practical application and integration of science to conservation and management of native North American fish, wildlife, plants and their habitats in the following categories: Articles, Notes, Surveys and Issues and Perspectives. Papers that do not relate directly to native North American fish, wildlife plants or their habitats may be considered if they highlight species that are closely related to, or conservation issues that are germane to, those in North America.