Wetted Ramps Selectively Block Upstream Passage of Adult Sea Lampreys

IF 2.1 3区 农林科学 Q2 FISHERIES
Fishes Pub Date : 2024-07-23 DOI:10.3390/fishes9080293
Uli Reinhardt, Nicholas Corniuk
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Abstract

Dams fragment stream habitats and fishways around dams typically serve few species that are strong swimmers or jumpers. We tested a prototype wetted ramp designed to allow upstream passage of small-bodied fishes while blocking upstream movement of invasive sea lampreys in the Laurentian Great Lakes. We tested short, smooth ramps with 5–10 mm water depth in various combinations of ramp angle, water flow, and swim channel width with the aim to selectively block adult migrating sea lampreys (Petromyzon marinus) while passing sub-adult white suckers (Catostomus commersonii) and creek chubs (Semotilus atromaculatus). Sea lampreys easily passed a 0.75 ramp at a 5° angle, but very few individuals passed a similar ramp at a 10° angle, and none passed a longer ramp at a 5° angle. Limiting the amplitude of tailbeats in a narrow channel did not hamper lampreys or the other species. Greater water flow, and thereby greater immersion depth on the ramp, fostered passage for all species. Smaller-bodied individuals of creek chubs and white suckers performed best on the ramp. We showed that wetted ramps could be incorporated into fishways at low-head dams to aid the passage of smaller-bodied fishes while also blocking the spawning migration of adult sea lampreys.
湿润坡道选择性地阻挡成年海灯鱼逆流而上
大坝使溪流生境支离破碎,而大坝周围的鱼道通常只能为少数游泳或跳跃能力强的物种提供服务。我们测试了一种湿润坡道原型,其设计目的是允许小体型鱼类逆流而上,同时阻挡劳伦伦五大湖区入侵海灯鱼逆流而上。我们测试了水深为 5-10 毫米的光滑短斜坡,并对斜坡角度、水流和泳道宽度进行了不同组合,目的是有选择性地阻挡成年洄游海灯鱼(Petromyzon marinus),同时让亚成体白吮吸鱼(Catostomus commersonii)和溪鲦(Semotilus atromaculatus)通过。海灯鱼很容易通过 5° 角的 0.75 斜坡,但很少有个体通过 10° 角的类似斜坡,也没有个体通过 5° 角的更长斜坡。在狭窄的水道中限制尾拍的振幅并不会妨碍灯鱼或其他物种。更大的水流以及斜坡上更大的浸入深度有利于所有物种通过。体型较小的溪鲦和白吮吸鱼在斜坡上的表现最好。我们的研究表明,可以在低水头水坝的鱼道中加入浸湿斜坡,以帮助体型较小的鱼类通过,同时也能阻挡成年海灯鱼的产卵洄游。
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来源期刊
Fishes
Fishes Multiple-
CiteScore
1.90
自引率
8.70%
发文量
311
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