Fisheries and Aquatic Sciences

한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)
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Distribution pattern and population dynamics of Brown trout (Salmo trutta) and Snow trout (Schizothorax richardsonii) in Punatsangchhu River, Bhutan

  • Rupesh Subedi (Conservation Biology, College of Natural Resources, Royal University of Bhutan) ;
  • Dhan Bdr Gurung (Department of Forest Science, College of Natural Resources, Royal University of Bhutan) ;
  • Kinzang Namgay (Forestry, College of Natural Resources, Royal University of Bhutan) ;
  • Laxmi Sagar (Conservation Biology, College of Natural Resources, Royal University of Bhutan) ;
  • Rinchen Dorji (Natural Resource Management, College of Natural Resources, Royal University of Bhutan) ;
  • Tshering Pem (Biodiversity Officer, National Biodiversity Center) ;
  • Namkha Gyeltshen (Forestry, College of Natural Resources, Royal University of Bhutan)
  • 투고 : 2023.07.15
  • 심사 : 2024.02.16
  • 발행 : 2024.07.31
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초록

Among larger species of fish found in Punatsang chhu, Brown trout (Salmo trutta) and Snow trout (Schizothorax richardsonii) are notable species. Snow trout is a native species, whereas Brown trout is an introduced species. Brown trout is noted to have a negative impact on the population of native species worldwide. This study studied the population dynamics and structure of these species to detect if the introduced species affected the native species adversely. The study was conducted on a 30 km stretch of Punatsang chhu including its major and minor tributaries at about their confluences. In total, 56 sample plots of a 200 m sampling stretch were studied with a 200 m distance between each stretch. Length, weight, maturity, and sex data for both species were collected along with the habitat and water parameters. The two species were found to prefer different areas within a single stretch with a rare overlap. Snow trout were found to be distributed widely within the basin whereas Brown trout were only found in altitudes higher than 1,000 masl ($\overline{x}$ = 1,231.77) and in turbid waters (p = 0.009). Recruitment of Snow trout was not good whereas recruitment of Brown trout was good. Length-frequency graphs indicated good inverse J distribution for the Snow trout population and sporadic for Brown trout. There is an effect of Brown trout introduction to the Snow trout living in the study area. Places invaded by Brown trout have a lesser presence of Snow trout compared to places not invaded by these species.

키워드

과제정보

The research was funded by the World Wildlife Fund, Bhutan. The name of the grant agreement is "Research on Distribution Pattern and Population Dynamics of Brown trout (Salmo trutta) and Snow trout (Schizothorax richardsonii) in Punatsang Chhu" and the grant number is BT10971.

참고문헌

  1. Arostegui MC, Smith JM, Kagley AN, Spilsbury-Pucci D, Fresh KL, Quinn TP. Spatially clustered movement patterns and segregation of subadult Chinook salmon within the Salish Sea. Mar Coast Fish. 2017;9:1-12.
  2. Arslan M, Yildirim A, Bektas S. Length-weight relationship of Brown trout, Salmo trutta L., inhabiting Kan stream, Coruh basin, North-Eastern Turkey. Turk J Fish Aquat Sci. 2004;4:45-8.
  3. Ayllon D, Almodovar A, Nicola GG, Elvira B. Ontogenetic and spatial variations in Brown trout habitat selection. Ecol Freshw Fish. 2010;19:420-32.
  4. Belica L. Brown trout (Salmo trutta): a technical conservation assessment [Internet]. USDA Forest Service. 2007 [cited 2022 Oct 7]. https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5206799.pdf
  5. Dorji C. Habitat assessment of the critically endangered white-bellied heron (Ardea insignis) in Punatsangchu river basin, Bhutan [Internet]. The Rufford Foundation. 2016 [cited 2022 Oct 7]. https://ruffordorg.s3.amazonaws.com/media/project_reports/18913-1%20Presentation.pdf
  6. Dorji U, Gurung DB. Aquatic biodiversity of Bhutan. In: Gurung DB, Katel O, editors. An introduction to the biodiversity of Bhutan in the context of climate change and economic development. Punakha: College of Natural Resources; 2017. p. 56-74.
  7. Goodwin JCA, Andrew King R, Iwan Jones J, Ibbotson A, Stevens JR. A small number of anadromous females drive reproduction in a Brown trout (Salmo trutta) population in an English chalk stream. Freshw Biol. 2016;61:1075-89.
  8. Greer MJC, Crow SK, Hicks AS, Closs GP. The effects of suspended sediment on Brown trout (Salmo trutta) feeding and respiration after macrophyte control. N Z J Mar Freshwater Res. 2015;49:278-85.
  9. Gurung DB, Dorjii S, Tsheringi U, Wangyal JT. An annotated checklist of fishes from Bhutan. J Threat Taxa. 2013;5:4880-6.
  10. Gurung DB, Thoni RJ. Fishes of Bhutan: a preliminary checklist. Punakha: College of Natural Resources; 2015.
  11. Jan M, Jan N, Ahmed I. Length weight relationship (LWR) and condition factor (K) of Brown trout, Salmo trutta fario. J Ecophysiol Occup Health. 2018;18:73-9.
  12. Joshi KD, Das SCS, Khan AU, Pathak RK, Sarkar UK. Reproductive biology of Snow trout, Schizothorax richardsonii (Gray, 1832) in a tributary of river Alaknanda, India and their conservation implications. Int J Zool Invest. 2016;2:109-14.
  13. Kaspersson R, Sundstrom F, Bohlin T, Johnsson JI. Modes of competition: adding and removing Brown trout in the wild to understand the mechanisms of density-dependence. PLOS ONE. 2013;8:e62517.
  14. Kimball ME, Able KW. Nekton utilization of intertidal salt marsh creeks: tidal influences in natural Spartina, invasive Phragmites, and marshes treated for Phragmites removal. J Exp Mar Biol Ecol. 2007;346:87-101.
  15. Korsu K, Heino J, Huusko A, Muotka T. Specific niche characteristics facilitate the invasion of an alien fish invader in boreal streams. Int J Ecol. 2012;2012:1-10.
  16. Li Y, Feng M, Huang L, Zhang P, Wang H, Zhang J, et al. Weight-length relationship analysis revealing the impacts of multiple factors on body shape of fish in China. Fishes. 2023;8:269.
  17. Lobon-Cervia J. Introduction: princess of the streams: the Brown trout Salmo trutta L. as aquatic royalty. In: Lobon-Cervia J, Sanz N, editors. Brown trout: biology, ecology and management. West Sussex: John Wiley & Sons; 2017. p. 1-13.
  18. Lohani V, Ram RN. Length-weight relationship and condition factor based assessment of growth pattern of a cold water fish Schizothorax richardsonii from different habitats of Himalayan region. J Entomol Zool Stud. 2018;6:765-70.
  19. Maia CFQ, Valente ACN. The Brown trout Salmo trutta L. populations in the river Lima catchment. Limnetica. 1999;17:119-26.
  20. Pope KL, Lochmann SE, Young MK. Methods for assessing fish populations. In: Hubert WA, Quist MC, editors. Bethesda, MD: Inland fisheries management in North America; 2010. p. 325-51.
  21. Rajput V, Johnson JA, Sivakumar K. Environmental effects on the morphology of the Snow trout Schizothorax richardsonii (Gray, 1832). TAPROBANICA. 2013;5:102-10.
  22. Rawat MS, Bantwan B, Singh D, Gusain OP. Status of Brown trout (Salmo trutta fario L.) in Garhwal Himalaya with a note on it morphometric characteristics. Environ Conserv J. 2011;12:47-52.
  23. Reynolds JB, Babb LR. Structure and dynamics of largemouth bass populations. In: Novinger GD, Dillard JG, editors. New approaches to the management of small impoundments. Bethesda, MD: American Fisheries Society; 1978. p. 50-61.
  24. Rosenberg AA. Multiple uses of marine ecosystem. In: Proceedings of the Reykjavik Conference on Responsible Fisheries in the Marine Ecosystem; 2003; Reykjavik, Iceland.
  25. Saavedra-Diaz LM, Pomeroy R, Rosenberg AA. Managing small-scale fisheries in Colombia. Marit Stud. 2016;15:1-21.
  26. Sharma A, Dubey VK, Johnson JA, Rawal YK, Sivakumar K. Introduced, invaded and forgotten: allopatric and sympatric native Snow trout life-histories indicate Brown trout invasion effects in the Himalayan hinterlands. Biol Invasions. 2021a;23:1497-515.
  27. Sharma A, Dubey VK, Johnson JA, Rawal YK, Sivakumar K. Spatial assemblage and interference competition of introduced Brown trout (Salmo trutta) in a Himalayan river network: implications for native fish conservation. Aquat Ecosyst Health Manag. 2021b;24:33-42.
  28. Spigarelli SA, Thommes MM, Prepejchal W, Goldstein RM. Selected temperatures and thermal experience of Brown trout, Salmo trutta, in a steep thermal gradient in nature. Environ Biol Fish. 1983;8:137-49.
  29. Terashima A. Three new species of the cyprinid genus Schizothorax from Lake Rara, northwestern Nepal. Jpn J Ichthyol. 1984;31:122-35.
  30. Thapliyal M, Bartwal M, Thapliyal A. Evaluation of altitudinal distribution and population dynamics of introduced Brown trout (Salmo trutta) and native Snow trout (Schizothorax richardsonii) in river Asiganga, Uttarakhand (India). Environ Conserv J. 2016;17:161-77.
  31. Treasurer JW. Age, growth and length-weight relationship of Brown trout Salmo trutta (L.) in the Loch of Strathbeg, Aberdeenshire. J Fish Biol. 1976;8:241-53.
  32. UWICER. Aquatic biodiversity assessment: a baseline study in Mangdechhu, Central Bhutan. Bumthang: UWICER Press; 2017.
  33. UWICER. Bhutan water facts August 2018. Bumthang: Ugyen Wangchuck Institute for Conservation and Environmental Research (UWICER); 2018.
  34. Vincent RE, Miller WH. Altitudinal distribution of Salmo trutta and other fishes in a headwater tributary of the South Platte river, Colorado. Ecology. 1969;50:464-6.
  35. Vishwanath W. Schizothorax richardsonii, Asla [Internet]. IUCN. 2020 [cited 2022 Dec 17]. https://www.iucnredlist.org/species/pdf/174786567
  36. Wangda P, Ohsawa M. Structure and regeneration dynamics of dominant tree species along altitudinal gradient in a dry valley slopes of the Bhutan Himalaya. For Ecol Manag. 2006;230:136-50.
  37. Wissinger SA, McIntosh AR, Greig HS. Impacts of introduced brown and rainbow trout on benthic invertebrate communities in shallow New Zealand lakes. Freshw Biol. 2006;51:2009-28.