Makivik Magazine Issue 91

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kN[7u 3vspn3†5 3vspnDt[iq5 24 Nunavik Research Fact Sheet 24 The Nepihjee River Arctic Charr The Nepihjee River Arctic charr population, introduced in 1999 to this river system directly northwest of Kuujjuaq, has had variable success over the past decade. According to monitoring reports compiled by the Nunavik Research Centre staff, a maximum of approximately 1000 individual charr went to sea in 2005. However, in the following years, monitoring the population became difficult due to extremely high and extremely low water flows in the river. wcl2Wu4 h3çtEi6. Measuring a charr. in oxygen signatures of each annual growth ring within an otolith, we can estimate the average temperature experienced by a fish in each year. We can then look at the relationship between temperature changes and growth within each year and over a fish’s lifetime. In short, by looking at the changes in oxygen signatures of each annual growth ring within an otolith, we can estimate the average temperature experienced by a fish in each year. What is the PIT-tagging for? Some charr are more likely to be affected by changes in temperature due to their size, diet or condition. Tagging charr will allow us to measure the growth of each individual fish from the time it was tagged until it is recaptured. This information can be used to study the differences in growth patterns among individuals. With enough recaptures, we can also get a more accurate estimate of the Nepihjee Arctic charr population size. miroslav chum x2 mr[4 eu3Dxq5 82 Efforts to monitor the population have recently been redoubled. In addition, researchers and technicians from the Nunavik Research Centre, in collaboration with the University of Waterloo, initiated a project during the summer of 2009 to investigate the effects of temperature on the growth of Arctic charr in the Nepihjee River system. Using the fish-way site built previously by the Nayumivik Landholding Corporation, the core monitoring program to count the number and size of migrants was continued—but with a twist. Twenty Arctic charr from the run were harvested for temperaturegrowth analyses, and another 250 charr were measured and tagged with Passive Integrated Transponder (PIT) tags. How can temperature effects on growth be measured? Arctic charr otoliths (the small “ear stones” found in fish) are a very valuable tool because they continue to grow throughout a fish’s life. As a result, annual growth rings are formed, much like the rings in a tree. The width of these rings is related to how much a fish grew during that year. Each growth ring also reflects the chemical signatures of the fish’s surroundings during the time that it formed. One particularly interesting element included in the otolith is oxygen. The types of oxygen molecules in the otolith are directly related to the temperature of the water a fish was living in at the time that part of the otolith was formed. In short, by looking at the changes wcl8i4 ªQx9M“D5p[4 nNIsMsJJ6 xs4Ay @))(-at9lA. A fishway trap that was installed in August 2009. Can Arctic charr adapt? Warming temperatures threaten cold-water adapted species such as Arctic charr, particularly in polar regions where climate change impacts are likely to be accelerated. It is a great challenge to forecast the fate of Arctic charr, especially in unique areas such as the Nepihjee where the population is so young. Obtaining essential information such as population size, individual lengths, and the relationship between growth and temperature, is critical in terms of maintaining a sustainable fishery within an uncertain climate.
?i€ns2 S˜Ex3iEMsJIz Vanessa’s Visits ?i€n S˜ExMsJK6 mr{[s2 x9M[zk5 m8gpxu5gj5 bfix3hi xˆNu, €on8 w3Dux2, WNhx3[Q§zi4. ?i€n ybmi4 xzJ5yi4 cb1ato4 woIWxu9l, àf9u9l, ¥8u9l x7ml €+ou4. ?i€n xˆNui4 mo5hi S[3igoxMsJ7uJ6 bfIE sM sJ5hil wk7mE8i4 wM5nIui4. xox5gxWsJ t7uÔExu4, i5Il5Ìa xExu9l, W1axMÏQxu9l. WsQIc7m E7uhil ur ms+u4, mm3nhil Mñ1Iu4 x7ml mmEIc9lfxW7uhi ckw5glf3u4 wcl7u4. sammy Kudluk MAKIVIK mag a zine allison irqumia x3 Vanessa visited the <strong>Makivik</strong> office in Montreal to see where her mom, Allison Irqumia, works. Vanessa has four older siblings who are Elizabeth, Michael, Shane and Ashley. Vanessa also visited Puvirnituq with her mom and got to meet many of her adult relatives. She loves to go flying, singing, and playing. She also loves Mickey Mouse, lasagna and a certain kind of fish. 83
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Makivik Magazine Issue 91

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