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      Quantitative estimates of fish abundance from boat electrofishing

      Hicks, Brendan J.; Osborne, Matthew W.; Ling, Nicholas
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      Hicks, B.J., Osborne, M.W. & Ling, N. (2006). Quantitative estimates of fish abundance from boat electrofishing. Proceedings, Australian Society for Fish Biology annual conference, Darwin, NT, (pp. 11-15 ) July 2005.
      Permanent Research Commons link: https://hdl.handle.net/10289/2025
      Abstract
      Multiple removals by boat electro-fishing were used to estimate fish populations in non-wadeable habitats in New Zealand lakes and rivers. Mean capture probability was 0.47±h0.10 (± 95% CI) from 35 population estimates made with 2-7 successive removals. The relationship between the population estimate from the Zippin method (Y)and the number of fish caught in the first removal (X) was significant (adjusted r2=0.84, P<0.001; Figure 2). The least-squares regression was Y = 1.55X 1.23. Mean density ± 95% confidence interval for 13 fishing occasions was 30±27 fish 100 m-

      2. Mean biomass of fish for sites was 78±39 g m-2 (range 29 to 245 g m-2). Koi carp comprised the largest proportion of the fish biomass wherever they were present. The high biomasses of koi carp estimated in these results (mean 56±33 g m-2) suggest that they can reach problematic abundances in New Zealand. Bioniass of spawning koi carp can exceed 400 g m-2.
      Date
      2006
      Type
      Conference Contribution
      Publisher
      Conference held 11-15 July 2005, Darwin, Northern Territory, Australia
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      • Science and Engineering Papers [3124]
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