Evaluation of procedures to reduce bias in fish growth parameter estimates resulting from size-selective sampling

Gwinn, Daniel C.; Allen, Micheal S.; Rogers, Mark W.

doi:10.1016/j.fishres.2010.03.005

Cited by 59 publications

(67 citation statements)

References 14 publications

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“…However, comparisons of individual growth parameters in isolation across regions can be problematic because L ∞ , K , and t 0 are typically strongly correlated (Shepherd, 1987) and actual realized growth rates (size-at-age) are a combination of all three values (Gwinn, Allen & Rogers, 2010; Pardo, Cooper & Dulvy, 2013). To compare growth across regions directly, we used reported VBGF parameters from previous studies to calculate mean size-at-age for lionfish at age 1, 2 and 3 (; Table 4).…”

Section: Discussionmentioning

confidence: 99%

Age, growth and population structure of invasive lionfish (Pterois volitans/miles) in northeast Florida using a length-based, age-structured population model

Johnson

Swenarton

2016

PeerJ

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The effective management of invasive species requires detailed understanding of the invader’s life history. This information is essential for modeling population growth and predicting rates of expansion, quantifying ecological impacts and assessing the efficacy of removal and control strategies. Indo-Pacific lionfish (Pterois volitans/miles) have rapidly invaded the western Atlantic, Gulf of Mexico and Caribbean Sea with documented negative impacts on native ecosystems. To better understand the life history of this species, we developed and validated a length-based, age-structured model to investigate age, growth and population structure in northeast Florida. The main findings of this study were: (1) lionfish exhibited rapid growth with seasonal variation in growth rates; (2) distinct cohorts were clearly identifiable in the length-frequency data, suggesting that lionfish are recruiting during a relatively short period in summer; and (3) the majority of lionfish were less than two years old with no lionfish older than three years of age, which may be the result of culling efforts as well as ontogenetic habitat shifts to deeper water.

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Section: Discussionmentioning

confidence: 99%

Age, growth and population structure of invasive lionfish (Pterois volitans/miles) in northeast Florida using a length-based, age-structured population model

Johnson

Swenarton

2016

PeerJ

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“…Meanwhile, observed sex ratio of sampled individuals was not significantly different from parity in our study but biased in favour of males in Atatürk Dam Lake in the same River (Oymak, et al, 2011). Inability to cover all age groups and having biased sex ratio in fisheries stock assessment studies seems to depend mainly on the fishing area and sampling gear selectivity (Catalano and Allen, 2010;Gwinn, et al, 2010). Growth rate and sexual maturity in poikilotherms, including most fish, is a function of temperature and the thermal integral, known as the growing degree-day (°C-day), is recognized to be a reliable predictor of growth and development (Neuheimer and Taggart, 2007).…”

Section: Discussionmentioning

confidence: 99%

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Al-Saleh¹,

Hammoud²,

Hussein³

et al. 2012

Turk. J. Fish. Aquat. Sci.

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Endemic asp, Aspius vorax, from the middle section of the Euphrates River flowing through eastern Syria were studied to determine the main characteristics of their population structure, morphological parameters and reproductive biology. Samples ranged between 0+ and 4+ years of age and were dominated by 2+ years old group. Total length (TL) ranged between 19 and 70 cm corresponding with 46 to 2824.5 g weight, respectively. Fish growth has isometric pattern and the overall sex ratio was unbiased. Seasonal changes in the condition factor were related with the water temperature as well as t he spawning season. Annual cycle of gonadosomatic index (GSI) readings indicated that spawning season occur around March when fish longer than 36 cm can mate. Average pre-spawning GSI was greater in individuals older than 2 years. Meanwhile, female fecundity was highly related to TL and weight. These findings did not always concur with previous observations from other asp populations, mainly in southern and northern Mesopotamia. Our results highlighted basic biological aspects of the local population and indicated differences between populations which can assist in fisheries management, conservation and commercial culture of the investigated species.

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“…Growth estimates are likely to be biased (Gwinn et al. ) and mortality is likely to be overestimated (Miranda and Bettoli ) if large, older individuals are not appropriately represented in fall samples. Consequently, efforts to model and implement management actions on these populations using fall standardized data could produce inaccurate estimates.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

Schall

Schoenebeck

Koupal

2019

N American J Fish Manag

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Sampling is often standardized with regard to time and space to monitor population characteristics. Effective sampling of large reservoirs can be complicated by the inherit bias of habitat variability along the reservoir gradient. Our objective was to assess spatial and seasonal distribution patterns of target and nontarget fish species in a large reservoir to identify potential sources of bias. A multitude of fish community and habitat characteristics were measured during seasonal (spring, summer, and fall) gill‐net surveys in 2015 and 2016 at Lake McConaughy, Nebraska. Spatial assessments along the longitudinal gradient (up‐reservoir to down‐reservoir) and between opposing shorelines were made for fish metrics from the seven most common species, and associations between species‐specific relative abundance and habitat data were examined. Spatial differences in relative abundance and size structure occurred for nearly all species, with the greatest spatial variability occurring between the upper and lower reservoir zones, but few strong correlations were observed between species‐specific relative abundances and habitat data. Seasonal differences occurred in relative abundance and size structure for most species, and size structure was lowest in the fall for most species. To reduce the impact of spatial variability, we determined the minimum required sampling effort to achieve precise estimates of mean catch per net‐night using two resampling strategies, with 16 or fewer gill‐net sets required for five of seven species and 14 or fewer required if a stratified random approach is utilized. This research quantifies the extent of spatial and temporal variability in standardized sampling on a large reservoir and provides novel insight for managers of similar systems considering a stratified random approach to reduce sampling effort while maintaining desired levels of precision.

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Evaluation of procedures to reduce bias in fish growth parameter estimates resulting from size-selective sampling

Cited by 59 publications

References 14 publications

Age, growth and population structure of invasive lionfish (Pterois volitans/miles) in northeast Florida using a length-based, age-structured population model

Age, growth and population structure of invasive lionfish (Pterois volitans/miles) in northeast Florida using a length-based, age-structured population model

Untitled

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

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