An Experimental Study on the Swimming Performance of Pale Chub(Zacco platypus)

Abstract

The local migration or movement behavior of fishes in streams are related to feeding, spawning, growing, dispersing, and refuging. The pale chub (Zacco platypus) is a dominant species that migrates locally and inhabits in river and stream in Korea. However, dams, weirs, culverts and other regulatory structures are physical barriers that limit fish movement and fragment habits and populations. If main stream and off-channel habitats are connected with culverts, they would restrict the small fish as pale chub movement due to the high flow velocities and low depths. But in Korea, there is no experimental study to evaluate the swimming performance of species in Korea. Therefore, it is difficult to proposed that design guidelines for pass fishes through culverts. The purpose of this experimental study is to evaluate the swimming performance of pale chubs. A series of swimming performance test has been used in both of the fixed velocity and the incremental velocity methods in an experimental flume. As a result, the critical swimming speed for pale chub(body length 8.9 cm) was found to be about 0.7 m/s. Therefore, the flow velocity for culvert design in the low flow condition should not be exceed the its swimming ability, especially 0.7 m/s for pale chubs(body length 8.9 cm). And the minimum depth for culvert design in the low flow condition should not be lower than the fish body height add a dorsal fin height.

Seasonal variation in longitudinal connectivity for fish community in the Hotancheon from the Geum River, as assessed by environmental DNA metabarcoding

“…The relative frequencies among sites for two species N. koreanus and Z. platypus, which are known to have relatively high swimming abilities (i.e., high mobility) and R. brunneus, which has low swimming abilities (low mobility) suggest that they could all move to upstreams probably because of using suckers (Misheel et al 2019;Park et al 2008;Song and Baek 2005), given they were detected at all sampling sites. Nipponocypris koreanus appeared at a sharply low frequency in the upstream S10-S12 sites, and Z. platypus was at a low frequency in the midstream S5-S6, and upstream S11-S12.…”

“…Nipponocypris koreanus appeared at a sharply low frequency in the upstream S10-S12 sites, and Z. platypus was at a low frequency in the midstream S5-S6, and upstream S11-S12. These two species are highly mobile (Misheel et al 2019;Park et al 2008), but their population connectivity seems to be restricted after S10 upstream due to artificial structures, and thus they mainly occur in mid-to-downstreams. In addition, since A3 to S12 are mid-upstream and usually have low flow rates, it would be conceivable that R. oxycephalus, a species that mainly inhabits upper mountain stream, has a higher frequency than N. koreanus and Z. platypus (Lee et al 2017).…”

Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream

“…수직낙차가 있는 어도에서는 도약종을 대상으로 어도 통 과 가능 여부를 판단했는데, 하단수심이 어종의 최소준비수심 보다 깊고 낙차가 최대도약높이보다 작으며, 상단수심이 최소 유영수심보다 깊은 경우 통과 가능한 것으로 평가하였다. 도 약종이란 점프 능력을 가진 어류를 의미하며, 어류의 도약능 력은 낙차가 있는 흐름에서 어류가 상류로 이동하기 위한 중 요한 이동수단이다 24).…”