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Abstract - Issue Jul 2022, 43 (4) Back
nstantaneous and historical temperature effects on a-pinene
Optimal
time of year and fishing methods for controlling exotic fishes in Longluan
Lake, Taiwan
S.H.
Liang1, C.D. Tsai2, Y.W. Chiu3, C.W. Tso4,
Y.L. Huang5 and D.J. Huang6*
1Department of
Biotechnology, National Kaohsiung Normal University, No.62, Shenjhong Rd.,
Yanchao District, Kaohsiung-82446, Taiwan
2Department of
Environmental Resources Management, Chia-Nan University of Pharmacy &
Science, Tainan-71710, Taiwan
3Department of
Biological Resources, National Chiayi University, 300 University Road,
Chiayi, Taiwan
4Department of
Tourism and Leisure Management, China University of Technology, Taipei-116
077, Taiwan
5Department of
Visual Communication Design, National Yunlin University of Science &
Technology, Yunlin-64002, Taiwan
6Department of
Environmental Resources Management, Chia Nan University of Pharmacy &
Science, Tainan-71710, Taiwan
*Corresponding
Author Email : daji@ms19.hinet.net
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Received: 14.10.2021
Revised: 03.01.2022
Accepted: 04.03.2022
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Abstract
Aim:
This study aimed to identify the optimal time and fishing methods for
removing exotic fishes, including striped snakehead (Channa striata),
marble goby (Oxyeleotris marmorata), tilapia (Oreochromis
spp.), three-spot gourami (Trichopodus trichopterus), and predatory
carp (Chanodichthys erythropterus), from Longluan Lake, which is
located in Kenting National Park in Taiwan.
Methodology: The selected fishing methods included lure fishing,
longline fishing, and fyke netting. A total of 2,284 individuals were
collected over 12 removal events in Longluan Lake from 2017 to 2019. Among
the collected fish, 1,640 fish represented exotic species, and 644 fish
represented native species.
Results:
Among the collected fish, 1,640 fish represented exotic species, and 644 fish
represented native species. Based on the results of this study, we suggest
that the optimal time for managing exotic fishes is from April to June, when
is the period representing lower water levels in Longluan Lake. For removing
specific exotic fish in Longluan Lake, employing lure fishing in natural
habitat is effective for C. striata and Oreochromis spp.,
utilizing fyke netting in natural habitat is workable for T. trichopterus
and C. erythropterus, and operating fyke netting in artificial habitat
is useful for O. marmorata.
Interpretation: The habitat preferences and sampling
efficiency of gears vary among exotic fishes, however, a combination of
applying lure fishing and fyke netting in both habitat types will achieve the
greatest advantage for controlling exotic fishes in the Longluan Lake.
Key words: Exotic fishes, Fyke netting, Invasive species,
Longluan Lake, Sampling efficiency
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conclusions enforced or derived, rest completely with the author(s).
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