Long-term changes in body condition and gillnet selectivity in Lake Constance pelagic spawning whitefish (Coregonus wartmanni)

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2021
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DeWeber, J. Tyrell
Rösch, Roland
Baer, Jan
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Canadian Journal of Fisheries and Aquatic Sciences. Canadian Science Publishing. 2021, 78(7), pp. 841-851. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/cjfas-2020-0231
Zusammenfassung

The body condition of Lake Constance pelagic spawning whitefish (Coregonus wartmanni) has changed substantially during the past century and altered the length-based selectivity of gillnets. Linked hierarchical models using Bayesian inference and error propagation were used to estimate the monthly body condition of whitefish from 1932 to 2018 and condition-dependent gillnet selectivity from 1964 to 2018. As expected, body condition followed past trends in nutrient dynamics and was highest in summer months. Body condition was clearly linked to gillnet selectivity, with a weight increase of a 300 mm whitefish from 205 to 260 g predicted to reduce the mean (from 374 to 330 mm) and standard deviation (from 30.8 to 25.1 mm) of lengths selected by a 38 mm mesh gillnet. Simulations demonstrate that such changes can reduce the mean age in harvest by over 1 year and greatly bias population age distribution estimates if selectivity changes are ignored. Similar variation in gillnet selectivity is expected where trophic conditions or other factors cause body condition differences, and accounting for these changes could reduce biases to inform fishery management.

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570 Biowissenschaften, Biologie
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ISO 690DEWEBER, J. Tyrell, Roland RÖSCH, Jan BAER, Alexander BRINKER, 2021. Long-term changes in body condition and gillnet selectivity in Lake Constance pelagic spawning whitefish (Coregonus wartmanni). In: Canadian Journal of Fisheries and Aquatic Sciences. Canadian Science Publishing. 2021, 78(7), pp. 841-851. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/cjfas-2020-0231
BibTex
@article{DeWeber2021Longt-54433,
  year={2021},
  doi={10.1139/cjfas-2020-0231},
  title={Long-term changes in body condition and gillnet selectivity in Lake Constance pelagic spawning whitefish (Coregonus wartmanni)},
  number={7},
  volume={78},
  issn={0706-652X},
  journal={Canadian Journal of Fisheries and Aquatic Sciences},
  pages={841--851},
  author={DeWeber, J. Tyrell and Rösch, Roland and Baer, Jan and Brinker, Alexander}
}
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