Status of the Tana/Teno River salmon populations in 2019

• Main Authors: Falkegård, Morten, Orell, Panu, Foldvik, Anders, Erkinaro, Jaakko
• Format: Report
• Language: English
• Published: Tana Monitoring and Research Group 2020
• Subjects: Report from the Tana Monitoring and Research Group; exploitation; fisheries management; management targets; mixed-stock fishery; monitoring; overexploitation; pre-fishery abundance; Salmo salar; spawning targets; status assessment; status evaluation; stock recovery; stock status; VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480; Norway; Teno; Kárášjohka; Inarijoki; Vetsijoki; Báišjohka; Utsjoki
• Online Access: http://hdl.handle.net/11250/2634292

Anon. 2019. Status of the Tana/Teno River salmon populations in 2019. Report from the Tana Monitoring and Research Group nr 1/2019. This report is the third status assessment of the re-established Tana Monitoring and Research Group (MRG) after the new agreement between Norway and Finland. After a summary of salmon monitoring time series in Tana/Teno, we present an updated status assessment of 15 stocks/areas of the Tana/Teno river system. All stocks are evaluated in terms of a management target defined as a 75 % probability that the spawning target has been met over the last four years. A scale of four years has been chosen to dampen the effect of annual variation on the status. The map below summarizes the 2016-2019 stock status of the evaluated parts of the Tana/Teno river system. Symbol colour designates stock status over the last four years, classified into five groups with the following definitions: 1) Probability of reaching the spawning target over the last four years higher than 75 % and attainment higher than 140 % (dark green color in the summary map below) 2) Probability higher than 75 %, attainment lower than 140 % (light green) 3) Probability between 40 and 75 % (yellow) 4) Probability under 40 %, at least three of the four years with exploitable surplus (orange) 5) Probability under 40 %, more than one year without exploitable surplus (red) Stock status over the last four years (2016-2019) was poor (probability of reaching management target <40 %) in 7 of the 15 stocks that we evaluated. The best status was found in Veahčajohka/Vetsijoki, Ohcejohka/Utsjoki and Báišjohka. Of the stocks with poor status, the most important thing to note is the status of the upper main headwater areas of Kárášjohka, Iešjohka and Anárjohka/Inarijoki and of the Tana/Teno main stem. These areas had low target attainment and low exploitable surplus. These four areas constitute 84 % of the total Tana/Teno spawning target and over the last four years, these areas together have lacked an average of 30 000 kg female ...