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7. Group size influences light‐emitting diode light colour and substrate preference of David's Schizothoracin ( Schizothorax davidi ): Relevance for design of fish passage facilities

Author

Mi Xiangyuan, William M. Twardek, Hao Jiang, Zhang Dongxu, Steven J. Cooke, Zhang Chaoshuo, Bao Jianghui, Ming Duan, and Li Weiwei

Subjects
Light colour, biology, law, Schizothorax davidi, Environmental Chemistry, %22">Fish , Zoology, biology.organism_classification, Substrate (marine biology), General Environmental Science, Water Science and Technology, Light-emitting diode, law.invention
Published
2021

11. Group size influences light‐emitting diode light colour and substrate preference of David's Schizothoracin (Schizothorax davidi): Relevance for design of fish passage facilities.

Author

Li, Weiwei, Bao, Jianghui, Zhang, Chaoshuo, Mi, Xiangyuan, Zhang, Dongxu, Jiang, Hao, Twardek, William M., Cooke, Steven J., and Duan, Ming

Subjects
LIGHT emitting diodes, SCHIZOTHORAX, FISHWAYS, BLUE light, COLORED light, AQUARIUMS
Abstract

Fish passage structures have been constructed to facilitate fish movement past barriers, though the effectiveness of passage structures is highly variable. Designing fish passage structures that consider the behavioural preferences of fish under different environmental conditions (e.g., light colour, substrate type) has the potential to improve fish passage success. Similarly, whether a fish encounters a passage facility alone or in a group may influence fish behaviour. In this case, we assessed the preference of different group sizes (n = 1, 6 and 12, respectively) of David's Schizothoracin Schizothorax davidi under four different light‐emitting diode colours and eight different substrate types in the aquaria of the Houziyan Reproduction Station. We found that singletons preferred to visit the white light, cement and fine pebble, while the fish in groups preferred to visit the blue light, fine pebble and cobble. In addition, the total percentage of mobility frequency (18.3 ± 1.8%), movement velocity (20.4 ± 15.9 cm/s) and distance moved (15.8 ± 1.8 m) of singletons in blue light were much lower than that in the others. The movement velocity (3.3 ± 0.6 cm/s) of singletons on cobble was less, but the percentage of total mobility time (162.9 ± 16.0%) and distance moved (153.4 ± 19.6 m) on the cobble were much greater. Our research yielded novel insights for improving passage efficiency for this species. Findings from this study suggest there should be greater consideration of light colour and substrate type when designing fish passage facilities. Because fish almost always experience dynamic hydraulic conditions near and in fishways, additional research is needed to understand the generality of these findings in systems under lotic characteristics. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Quantitative assessment of fish passage efficiency at a vertical-slot fishway on the Daduhe River in Southwest China

Author

Ming Duan, Bao Jianghui, Li Hongtao, Xiujiang Zhao, William M. Twardek, Li Weiwei, Mi Xiangyuan, Zhang Chaoshuo, Steven J. Cooke, and Na Cao

Subjects
Fish migration, Environmental Engineering, biology, Context (language use), 04 agricultural and veterinary sciences, Silurus meridionalis, 010501 environmental sciences, Management, Monitoring, Policy and Law, biology.organism_classification, 01 natural sciences, Additional research, Fishery, Semilabeo prochilus, 040103 agronomy & agriculture, Quantitative assessment, 0401 agriculture, forestry, and fisheries, Environmental science, %22">Fish , Schizothorax, 0105 earth and related environmental sciences, Nature and Landscape Conservation
Abstract

Fish passage facilities are constructed to enable fish to pass anthropogenic barriers such as dams though their efficiency varies across species and location. There are a number of studies that assess the efficiency of fish passage facilities, yet rarely have such assessments been conducted in Asia. We conducted one of the first quantitative assessments of the efficiency of a vertical-slot fishway in Asia on the Daduhe River in Southwest China. Quantitative assessment of fish passage efficiency was conducted using a combination of methods, including fish sampling, video recordings and a Passive Integrated Transponder (PIT) system for tracking individually-tagged fish (N = 69 of 6 species). Fish sampling revealed 40 species assembled downstream of the dam. Fish captured closer to the fishway tended to be larger than fish caught more distant from the fishway. Half of the fish species observed downstream of the fishway were also observed at the entrance to the fishway (i.e. 153 individuals across 20 species). Video records revealed that overall passage rates were 71.2% based on the number of fish observed at the exit of the viewing chamber relative to that observed passing the entrance viewing chamber. Most fish passed the fishway at night with peak passage occurring in June. PIT technology results revealed that passage efficiency among the six tagged species ranged from 0% to 60% (four species successfully ascended the fishway). Transit time from the fishway entrance to exit was variable both among and within species that successfully ascended the fishway (i.e. 17.9–20.3 h for Schizothorax davidi, 6.4–88.8 h for Schizothorax preuanti, 46.4 h for Silurus meridionalis, 22.1–53.9 h Semilabeo prochilus). Fishway performance varied by species such that there is evidence that the fishway may be useful for maintaining river connectivity for some species. However, passage was often restricted during periods when there was sufficient flow in the fishway. Additional research is needed to put these findings in an ecological context given the overall low number of fish that passed the dam.

Published
2019

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