Evaluation of Probabilistic Sampling Designs for Estimating Abundance of Multiple Species of Migratory Fish Using Video Recordings at Fishways

McCormick, Joshua L.; Jackson, Laura S.; Carr, Fabian M.; Meyer, Daniel H.

doi:10.1080/02755947.2015.1040562

Cited by 5 publications

(13 citation statements)

References 17 publications

(23 reference statements)

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“…Our interest was to develop a method to estimate daily run size of fish, not seasonal or annual run sizes as done in the retrospective studies of Jessop Harvie [ 4 ], Davies et al [ 6 ] and McCormick [ 9 ]. Using the DARSE method to estimate seasonal or annual run size would require daily counts or counts on a certain number of days sampled throughout the season or year.…”

Section: Discussionmentioning

confidence: 99%

“…However, sampling to efficiently estimate run size is complicated by annual variation in timing, duration, daily pattern, and run size [ 4 ]. Therefore, various sampling designs to estimate run size have been evaluated [ 4 , 6 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Visual counts to estimate run size was done in early studies using simple random or systematic samplings with a fraction of an hour (e.g., 5 or 10 min) as a sample unit (e.g., [ 10 , 11 ]). Subsequently, Jessop & Harvie [ 4 ], Davies et al [ 6 ] and McCormick et al [ 9 ] applied retrospective sampling—the use of historical data to set future sampling goals [ 12 ]—to compare estimates of run size among sampling designs and determine the required sample size for each. These three retrospective sampling studies knew the true run size, so accuracy and precision of the estimates could be investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The studies of Jessop & Harvie [ 4 ] and Davies et al [ 6 ] estimated run size for a single species using a fraction of an hour as the sample unit. Differently, the retrospective sampling study of McCormick et al [ 9 ] estimated run size for multiple species/run-types and used day as the primary sample unit and hour (or group of hours) as the secondary sample unit. McCormick et al [ 9 ] evaluated five sampling designs and concluded that one- and two-stage stratified designs were more accurate than simple random sampling designs for most species/run-types.…”

Section: Introductionmentioning

confidence: 99%

“…The sample units of the aforementioned studies were a fixed fraction of an hour, such as the 15-min or 20-min used by Jessop & Harvie [ 4 ], Davies et al [ 6 ] and Nelson [ 8 ], or the hour, group of hours or day as in McCormick et al [ 9 ]. In the present study, we introduce the daily run-size estimation (DARSE) method, which determines the minimum fraction of each hour of the day or hourly samples necessary to estimate daily run size with known accuracy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways

2021

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Determining the number of fish that use a fishway is essential to fisheries management but counting all fish can be impracticable due to labor and cost. We present the daily run-size estimation (DARSE) method, which uses systematic sampling to estimate the number of fish per species that pass through a fishway daily (daily run size, D). The DARSE method makes it possible to determine the minimum fraction of each hour (or hourly samples) of the day necessary to estimate D with known accuracy. We apply DARSE to each of the seven most abundant fish species (other species grouped under ‘Others’) recorded in video images taken during 46 days of one year at the Igarapava Fish Ladder, Brazil. Accuracy in estimating D was influenced by the fraction of the hour sampled and the temporal pattern of fish passage through the fishway. For species with a more uniform temporal pattern of passage, the DARSE method reduced the time spent on sampling by up to 96%, depending on the accuracy used to estimate D. Some of these species required counts of fish that pass in a fraction of an hour for all hours of the day while counts for other species can be done every 2 hours or, more rarely, every 3 hours. For species with a more aggregated temporal pattern of passage, it was possible to estimate D by sampling a fraction of an hour but with reduced accuracy in the estimation of D and little reduction in sampling time.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways

2021

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Fish pass use by shads (Alosa alosa L. and Alosa fallax [Lacépède, 1803]): Implications for monitoring and management

et al. 2021

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Fish pass monitoring is essential to ensure the device's effectiveness as a mitigation measure for river impoundment, guaranteeing the longitudinal continuity of rivers, which is particularly important for diadromous fish that depend on obligatory migrations to freshwater reproduction (anadromous) or feeding areas (catadromous) to complete their life cycle. The upstream migration of the anadromous allis (Alosa alosa L.) and twaite (Alosa fallax Lacépède, 1803) shad in the River Mondego, Central Portugal, is being monitored at the Coimbra Dam fish pass since 2013, using visual counts. Statistical models were used to evaluate shad passage and to identify the main environmental variables that seem to condition their behaviour. A total of 26,561 shad were recorded in this infrastructure during the study period (2013–2017), with 96.5% of the total counted fish being counted between April and June. Overall, water temperature and river flow are the environmental predictors that consistently influence the number of shad using the fish pass, although its individual contribution changed between years. The models (Boosted Regression Trees) obtained were robust with an average explained deviance of 0.79 (R2), despite the poorer results associated with the 2015 spawning season, that were possibly related with the low number of adult fish observed that year. Results from this study contribute to better understand the dynamics associated with fish pass use by Alosa sp. and can help the conservation and management of these species through the improvement of fish pass attractiveness and, consequently, the overall efficiency of fish pass devices targeting shads.

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Abundance Trends for Adult Pacific Lamprey in Western Oregon (USA): Historic Declines, Recent Increases, and Relative Contributions from Coastal Rivers

et al. 2021

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The anadromous Pacific Lamprey Entosphenus tridentatus is native to the northern Pacific Ocean and its drainages, returning each spring to spawn in streams along the West Coast of North America. We analyzed abundance trends of adult Pacific Lamprey from dam counts and redd surveys in western Oregon, USA. We compared a series of generalized additive models (GAMs) to describe lamprey abundance trends. Lamprey counts varied considerably among dams but showed steep declines over 70+ years at Bonneville Dam on the Columbia River, over 50+ years (1965-2019) at Winchester Dam on the North Umpqua River, and over 17 years (1993-2009) at Gold Ray Dam on the Rogue River. By contrast, redd surveys displayed synchronous abundance trends of different magnitudes among geographic management areas on the Oregon coast, with an overall increasing abundance over 13 years (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019). This corroborates pre-existing notions that Pacific Lamprey spawning in Oregon coast rivers are from a single mixed population. The most supported GAM included a fixed effect for location and allowed abundance to vary over years as a function of location. These results suggest that abundance trends among dam counts are more variable than coastal redd surveys and that dam counts and redd surveys across this large region are not useful proxies for each other. Furthermore, counts across dams may be more variable because they record prespawning lamprey and thus may be recording a mixture of cohorts. Redd surveys, by contrast, provide a metric of a single cohort of spawning lamprey.

show abstract

Evaluation of Probabilistic Sampling Designs for Estimating Abundance of Multiple Species of Migratory Fish Using Video Recordings at Fishways

Cited by 5 publications

References 17 publications

Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways

Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways

Fish pass use by shads (Alosa alosa L. and Alosa fallax [Lacépède, 1803]): Implications for monitoring and management

Abundance Trends for Adult Pacific Lamprey in Western Oregon (USA): Historic Declines, Recent Increases, and Relative Contributions from Coastal Rivers

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