• ISSN 1000-0615
  • CN 31-1283/S
LI Yifan, AN Jianguo, PEI Ruihua, WU Pengju, HUANG Na, WANG Yakun, DING Sheng, CHEN Liping, LIU Qigen, HU Zhongjun. Structural attribute estimation of fish community in Dongguan ecological park wetland[J]. Journal of fisheries of china, 2023, 47(5): 059311. DOI: 10.11964/jfc.20210212635
Citation: LI Yifan, AN Jianguo, PEI Ruihua, WU Pengju, HUANG Na, WANG Yakun, DING Sheng, CHEN Liping, LIU Qigen, HU Zhongjun. Structural attribute estimation of fish community in Dongguan ecological park wetland[J]. Journal of fisheries of china, 2023, 47(5): 059311. DOI: 10.11964/jfc.20210212635

Structural attribute estimation of fish community in Dongguan ecological park wetland

Funds: National Key R & D Projects (2020YFD0900504, 2019YFD0900605)
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  • Corresponding author:

    HU Zhongjun. E-mail: zjhu@shou.edu.cn

  • Received Date: February 09, 2021
  • Revised Date: March 23, 2021
  • Accepted Date: February 27, 2023
  • Available Online: March 19, 2023
  • Published Date: April 30, 2023
  • Gillnet is extensively used as fishing tool throughout the world. However, it has high species- and size-selectivity for fishes because of net mesh size. The selectivity caused by net mesh size will inevitably reduce comparability on attributes of fish assemblages sampled with non-standard gillnets. Therefore, the standard of fish sampling with multi-mesh gillnets has been universally established and applied in North America and Europe since more than ten years ago. The standard will enhance the comparability across large space and long time scale. Unfortunately, there is so far no analogous standard in China. In this study, using two types of multi-mesh gillnets (benthic and floating) with 12 mesh sizes of 1.0, 1.25, 1.6, 2.0, 2.5, 3.1, 3.9, 4.8, 5.8, 7.0, 8.6 and 11.0 cm, we sampled fishes from June to December, 2019 in Dongguan ecological park wetland, an important component of the Dongguan National Urban Wetland Park wetland. The differences in attributes of catch community between two type of gillnets and among different nets mesh sizes were explored. We hope that this study will help to establish Chinese standard of fish sampling with multi-gillnets. Meanwhile, we revealed the structural characteristics of catch community in the wetland to provide scientific basis for its management. The results showed that a total of 13 fish species were collected, and Toxabramis houdemeri and Oreochromis mossambica were the dominant species in terms of relative importance index. The former species accounted for 84.8 percent of the abundance of the whole catch community and the latter one contributed 40.2 percent to its biomass, respectively. There was a significant difference between benthic and floating gillnets in catch species composition, but there were no significant difference in number per unit effort (NPUE), biomass per unit effort (BPUE) and species number; floating gillnet had significantly lower NPUE of two tilapia species (O. mossambica and Oreochromis nilotica) than benthic gillnet, but T. houdemeri did not significantly differ in NPUE between the two type of gillnets. Two species clusters of catches sampled by nets with 12 different mesh sizes were obtained using cluster analysis (CA) and non-metric multidimensional scaling (NMDS); one species cluster was composed of catches collected by nets with mesh size of 1.0-2.0 cm with indicator species of T. houdemeri, and another species cluster consisted of catches sampled by nets with mesh size of 2.5-11.0 cm with indicator species of O. mossambica and O. nilotica. Meanwhile, two size clusters of all catches were also obtained using CA and NMDS; one size cluster was made up of catches sampled with 1.0-3.9 cm mesh-size nets and another size cluster comprised catches collected with 4.8-11.0 cm mesh-size nets. With increasing mesh size, the average body length of catch increased linearly, while NPUE decreased by power function. To more scientifically estimate the fish community structure in inland waters, adding nets with mesh size of 1 to 2 cm to the multi-mesh gillnet and combining use of benthic and floating gillnets would be recommended in the future.
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