Age, Growth, and Size of Lake Superior Pygmy Whitefish (Prosopium coulterii)

Stewart, Taylor; Ogle, Derek H.; Gorman, Owen T.; Vinson, Mark R.

doi:10.1674/amid-175-01-24-36.1

Cited by 2 publications

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References 35 publications

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“…Eschmeyer and Bailey (1955) and Yule et al (2008) noted an increase in mean length of PWF with depth. As well, all PWF collected between ~ 18 and 26 m were young-of-the-year (YOY; Eschmeyer and Bailey 1955;Stewart et al 2016). The proportion of YOY decreased to 7% beyond 73 m and 0% at 80 m depth (Eschmeyer and Bailey 1955).…”

Section: Discussionmentioning

confidence: 85%

Quantifying status and trends from monitoring surveys: application to pygmy whitefish (Prosopium coulterii) in Lake Superior

Lee

Vinson

Koops

2022

Can. J. Fish. Aquat. Sci.

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Population assessments of fish species often rely on data from surveys with different objectives such as measuring biodiversity or community dynamics. These surveys often contain spatial-temporal dependencies that can greatly influence conclusions drawn from analyses. Pygmy whitefish (PWF, Prosopium coulterii) populations in Lake Superior were recently assessed as Threatened by the Committee on the Status of Endangered Species in Canada which motivated a thorough analysis of available data to improve our understanding of its population status. The U.S. Geological Survey conducts annual bottom trawl surveys in Lake Superior that commonly captures PWF. We used these data (1989-2018) to model temporal trends in PWF biomass-density and make lake-wide population projections. We used a Bayesian approach, Integrated Nested Laplace Approximation (INLA), and compared the impact of including different random structures on model fit. Inclusion of spatial structure improved model fit and conclusions differed from models omitting random effects. PWF populations have experienced periodic fluctuations in biomass-density since 1989, though 2018 may represent the lowest density in the 30-year time series. Lake-wide biomass was estimated to be 71.5t.

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Section: Discussionmentioning

confidence: 85%

Quantifying status and trends from monitoring surveys: application to pygmy whitefish (Prosopium coulterii) in Lake Superior

Lee

Vinson

Koops

2022

Can. J. Fish. Aquat. Sci.

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Age, Year‐Class Strength Variability, and Partial Age Validation of Kiyis from Lake Superior

Lepak

Ogle

Vinson

2017

N American J Fish Manag

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Age estimates of Lake Superior Kiyis Coregonus kiyi from scales and otoliths were compared and 12 years (2003–2014) of length frequency data were examined to assess year‐class strength and validate age estimates. Ages estimated from otoliths were precise and were consistently older than ages estimated from scales. Maximum otolith‐derived ages were 20 years for females and 12 years for males. Age estimates showed high numbers of fish of ages 5, 6, and 11 in 2014, corresponding to the 2009, 2008, and 2003 year‐classes, respectively. Strong 2003 and 2009 year‐classes, along with the 2005 year‐class, were also evident based on distinct modes of age‐1 fish (<110 mm) in the length frequency distributions from 2004, 2010, and 2006, respectively. Modes from these year‐classes were present as progressively larger fish in subsequent years. Few to no age‐1 fish (<110 mm) were present in all other years. Ages estimated from otoliths were generally within 1 year of the ages corresponding to strong year‐classes, at least for age‐5 and older fish, suggesting that Kiyi age may be reliably estimated to within 1 year by careful examination of thin‐sectioned otoliths. Received January 17, 2017; accepted June 26, 2017 Published online September 6, 2017

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Age, Growth, and Size of Lake Superior Pygmy Whitefish (Prosopium coulterii)

Cited by 2 publications

References 35 publications

Quantifying status and trends from monitoring surveys: application to pygmy whitefish (Prosopium coulterii) in Lake Superior

Quantifying status and trends from monitoring surveys: application to pygmy whitefish (Prosopium coulterii) in Lake Superior

Age, Year‐Class Strength Variability, and Partial Age Validation of Kiyis from Lake Superior

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