scholarly journals Age and growth of Niagara River Lake Sturgeon

2020 ◽  
Author(s):  
Jonah L Withers ◽  
Dimitry Gorsky ◽  
Zy Biesinger ◽  
Donald Einhouse ◽  
Michael Clancy ◽  
...  
Keyword(s):  
Age Structure ◽  
Growth Rates ◽  
Age Estimation ◽  
Stock Assessment ◽  
Lake Sturgeon ◽  
Age And Growth ◽  
Individual Growth ◽  
Estimation Accuracy ◽  
Niagara River ◽  
Age Estimates

Knowledge of the distribution of ages of fish within a stock, and subsequently individual growth rates, allows managers the ability to calculate key metrics (i.e., recruitment, mortality, and stock growth rate) that greatly improve stock assessment models. Two remnant stocks of Lake Sturgeon Acipenser fulvescens exist near and within the Niagara River; one primarily occupying the headwaters of the river and the other primarily occupying the mouth of the river. Though initial efforts in the late 1990s collected data on the lower Niagara River stock, a long-term, comprehensive examination of age and growth is lacking and the age structure of the stock found at the headwaters has yet to be formally described to our knowledge. To ascertain the current age structure of these two stocks we sampled Lake Sturgeon in the lower Niagara River and at the headwaters of the Niagara River between 2012 and 2017 and took a portion of the leading pectoral fin spine of captured Lake Sturgeon for age estimation. Ages ranged between 4 and 42 years with females generally being older and larger than males. The median age appeared to increase from 14 to 18 years old throughout our study in both stocks. Lengths-at-age of both stocks were larger than those reported in other systems and growth rates appear to have increased over the past decade in the lower Niagara River. Despite efforts to improve age estimation accuracy, age estimates from fish whose ages were partly-known (derived from multiple age estimates from fish that were captured multiple times) demonstrated assigned ages may have greater error than expected. Additionally, a lack of young individuals confounded growth analyses. Although there was uncertainty in the assigned ages, this study still provides evidence of consistent recruitment in both stocks and, to our knowledge, the first characterization of the age structure of the Lake Sturgeon stock occupying the headwaters of the Niagara River.

Growth rates of four Hawaiian deep slope fishes: a comparison of methods for estimating age and growth from otolith microincrement widths

1997 ◽  
Vol 54 (1) ◽  
pp. 126-136 ◽  
Author(s):  
H A Williams ◽  
M K Lowe
Keyword(s):  
Growth Rates ◽  
Growth Curves ◽  
Age And Growth ◽  
Interval Length ◽  
Fish Length ◽  
Comparison Of Methods ◽  
Increment Width ◽  
Daily Increment ◽  
Minimum Number ◽  
Age Estimates

Two methods were used to estimate the age and growth of four Hawaiian deep slope fishes. Otolith daily increment width estimates from radial sections of sagittal otoliths were integrated over the otolith radius to approximate age by (i) dividing interval length (micrometres) by mean increment width (micrometres per day) and summing this quotient for consecutive 500- µm radial intervals (S. Ralston and H.A. Williams. 1989. Fish. Bull. 87: 1-16) and (ii) fitting increment width (y) versus otolith radius (x) to a Gompertz rate curve and calculating the inverse integral of this curve (M.K. Smith and E. Kostlan. 1991. Fish. Bull. 89: 461-472). The methods also differ in the way the age-length key is generated. Ralston and Williams' method uses integrated age versus a regression-based estimate of fish length at 500- µm otolith radial intervals; Smith and Kostlan's method uses estimated age versus actual fish length. Neither method of integration produced significantly different age estimates; however, the use of regression-based fish length estimates instead of sampled fish lengths resulted in significant differences between estimated growth curves. The minimum number of daily increment width estimates required as a function of otolith radius was calculated, on the basis of observed microincrement width variation.

scholarly journals Queen triggerfish Balistes vetula: Validation of otolith-based age, growth, and longevity estimates via application of bomb radiocarbon

PLoS ONE ◽  
2022 ◽  
Vol 17 (1) ◽  
pp. e0262281
Author(s):  
Virginia R. Shervette ◽  
Jesús M. Rivera Hernández
Keyword(s):  
Age Estimation ◽  
Atlantic Coast ◽  
Fork Length ◽  
Growth Function ◽  
Age And Growth ◽  
Future Research ◽  
Fisheries Science ◽  
Fish Samples ◽  
Age Estimates

Ensuring the accuracy of age estimation in fisheries science through validation is an essential step in managing species for long-term sustainable harvest. The current study used Δ14 C in direct validation of age estimation for queen triggerfish Balistes vetula and conclusively documented that triggerfish sagittal otoliths provide more accurate and precise age estimates relative to dorsal spines. Caribbean fish samples (n = 2045) ranged in size from 67–473 mm fork length (FL); 23 fish from waters of the southeastern U.S. (SEUS) Atlantic coast ranged in size from 355–525 mm FL. Otolith-based age estimates from Caribbean fish range from 0–23 y, dorsal spine-based age estimates ranged from 1–14 y. Otolith-based age estimates for fish from the SEUS ranged from 8–40 y. Growth function estimates from otoliths in the current study (L∞ = 444, K = 0.13, t0 = -1.12) differed from spined-derived estimates in the literature. Our work indicates that previously reported maximum ages for Balistes species based on spine-derived age estimates may underestimate longevity of these species since queen triggerfish otolith-based ageing extended maximum known age for the species by nearly three-fold (14 y from spines versus 40 y from otoliths). Future research seeking to document age and growth population parameters of Balistes species should strongly consider incorporating otolith-based ageing in the research design.

scholarly journals Bomb radiocarbon dating of three important reef-fish species using Indo-Pacific Δ14C chronologies

2011 ◽  
Vol 62 (11) ◽  
pp. 1259 ◽  
Author(s):  
Allen H. Andrews ◽  
John M. Kalish ◽  
Stephen J. Newman ◽  
Justine M. Johnston
Keyword(s):  
Fish Species ◽  
Age Estimation ◽  
Radiocarbon Dating ◽  
Reef Fishes ◽  
Growth Zone ◽  
Age And Growth ◽  
Thin Sections ◽  
Bomb Radiocarbon ◽  
Reef Fish Species ◽  
Age Estimates

Demersal reef fishes of the Indo-Pacific are under increasing pressure as a fisheries resource, yet many of the important life history characteristics required for suitable management are poorly known. The three fish species, eightbar grouper (Hyporthodus octofasciatus), ruby snapper (Etelis carbunculus) and the spangled emperor (Lethrinus nebulosus), are important components of fisheries and ecosystems throughout the Indo-Pacific. Despite their importance, age and growth information is incomplete. Age has been estimated for E. carbunculus and L. nebulosus, but validated age beyond the first few years is lacking and for H. octofasciatus no age estimates exist. Bomb radiocarbon dating can provide age estimates that are independent of growth-zone counting, but only if appropriate reference Δ14C chronologies exist. In this study, a series of Δ14C records from hermatypic corals was assembled to provide a basis for bomb radiocarbon dating in the western Indo-Pacific region. Results provided (1) valid age estimates for comparison to age estimates from two facilities investigating growth-zones in otolith thin sections; (2) support for age estimation protocols using otolith thin sections; and (3) the information necessary for further refinement of age estimation procedures. Estimates of longevity from bomb radiocarbon dating agree with some prior studies: H. octofasciatus, E. carbunculus and L. nebulosus all being long-lived species with life spans of at least 43, 35 and 28 years respectively.

scholarly journals Discovery of an Undocumented Lake Sturgeon Spawning Site in the Headwaters of the Niagara River

2018 ◽  
Vol 9 (1) ◽  
pp. 266-273 ◽  
Author(s):  
Rachel D. Neuenhoff ◽  
Jonah L. Withers ◽  
Lori A. Davis ◽  
Nicholas D. Markley ◽  
Stephanie Dowell ◽  
...  
Keyword(s):  
Life History ◽  
Early Life ◽  
Lake Erie ◽  
Stock Assessment ◽  
Early Life History ◽  
Lake Sturgeon ◽  
Western Basin ◽  
Niagara River ◽  
Spawning Site ◽  
Spawning Sites

Abstract Information about spawning fish is important to stock-assessment data needs (i.e., recruitment and fecundity) and management (i.e., habitat connectivity and protection). In Lake Erie, information about Lake Sturgeon Acipenser fulvescens early-life history is available for the Detroit River and Lake St. Clair system in the western basin, but fisheries biologists know comparatively little about Lake Sturgeon in the eastern basin. Although researchers have summarized historical spawning areas, no known natural Lake Sturgeon spawning site is described in Lake Erie proper. Researchers documented a remnant population of reproductively mature Lake Sturgeon near the headwaters of the Niagara River in eastern Lake Erie in 2011. Researchers hypothesized that a spawning site was likely in the immediate vicinity of the Niagara River headwaters near Buffalo Harbor, New York; however, its exact location was unknown. We attempted to locate spawning sites near the confluence of the Niagara River using egg traps at three potential spawning sites. We identified Lake Sturgeon eggs at one of these sites using morphological and genetic techniques. Lake Sturgeon eggs collected on one sampling trip began to emerge when placed in preservative, confirming that eggs deposited at this site are fertilized and viable, and that the area supports viable embryos. This discovery fills data gaps in the early-life history for this population, which has domestic and international management implications with respect to proposed recovery targets, stock assessment models, habitat remediation efforts, and status determinations of a protected species in a geographic region designated as an Area of Concern by the International Joint Commission.

scholarly journals Age and growth of pompano, Trachinotus ovatus, from the Strait of Messina (central Mediterranean Sea)

2021 ◽  
Vol 85 (3) ◽  
pp. 175-185
Author(s):  
Danilo Malara ◽  
Francesco Longo ◽  
Luca Pagano ◽  
Maria Giulia Stipa ◽  
Teresa Romeo ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Age Estimation ◽  
Growth Models ◽  
Stock Assessment ◽  
Fork Length ◽  
Age And Growth ◽  
Central Mediterranean ◽  
Trachinotus Ovatus ◽  
Von Bertalanffy Model ◽  
The Relationship

This is the first paper to provide detailed information on the age and growth of Trachinotus ovatus. The size of the 244 individuals collected in the Strait of Messina ranged from 2.7 to 30.4 cm in fork length (LF) and 0.31 to 508.6 g in body mass (M). The relationship between these parameters (M - LF) was investigated and showed a good fit. Age estimation based on vertebrae and otoliths yielded similar results, suggesting a maximum age of five years. However, the precision and accuracy tests, such as percentage of agreement (PA), mean coefficient of variation (ACV) and average percent error (APE) indicated that the otolith readings (97.83% PA, 0.54% ACV and 0.38% APE) were more reliable for age estimation than vertebrae readings (82.17% PA, 5.33% ACV and 3.77% APE). The multi-model inference approach allowed us to compare different non-linear growth models. The von Bertalanffy model (L∞=29.139, k=0.496 and t0=−0.347) fitted the length-at-age data best. This species has a relatively rapid growth and an estimated longevity of five to seven years. This information could be used for management and first stock assessment studies on T. ovatus in the Mediterranean Sea.

scholarly journals Age estimation accuracy based on Atlas London and Schour-Massler in Tionghoa ethnic children

2021 ◽  
Vol 5 (2) ◽  
pp. 52
Author(s):  
Icha Artyas Annariswati ◽  
Shintya Rizki Ayu Agitha
Keyword(s):  
Age Estimation ◽  
Estimation Accuracy ◽  
P Value ◽  
Dental Age ◽  
Dental Age Estimation ◽  
Ethnic Chinese ◽  
Significant Difference ◽  
Inclusion Level ◽  
The Right ◽  
Age Estimates

Objectives: Age estimation is an important factor in forensic science and needs to be known accurately because it can narrow the search when examining unidentified victims, determine the victim's age at death and is also useful in cases of adulteration of athletes, child guardianship, or to determine whether someone is of legal age. or not according to the law. This study aims to determine individual age estimates based on the London Atlas and Schour-Massler Atlas and compare the accuracy of the two methods. Materials and Methods: 70 panoramic radiographs consisting of 31 boys and 39 girls from Chinese ethnicity in Surabaya, aged 6-13 years (72-156 months). Samples were determined for dental age based on the London Atlas and the Schour-Massler Atlas. The data that has been obtained is then processed by statistical analysis with SPSS for Windows, with an inclusion level of p <0.05. Results: This study showed that the London Atlas was better and more accurate than the Schour-Massler Atlas with a lower mean error and there was no significant difference between the London Atlas dental age estimation and chronological age with p value = 0.426 in the left region and p = 0.429 in the right region (p>0.05). Conclusion: The results obtained from this study indicate that dental development based on the London Atlas and Schour-Massler Atlas can be used as a method to determine the estimated age of children from the range of 6 - 13 years in ethnic Chinese.

Age and growth of sharptooth catfish, Clarias gariepinus (Burchell, 1822) (Clariidae), in the Lower Okavango Delta, Botswana

2015 ◽  
Vol 66 (5) ◽  
pp. 420 ◽  
Author(s):  
Thethela Bokhutlo ◽  
Olaf L. F. Weyl ◽  
Ketlhatlogile Mosepele ◽  
G. Glenn Wilson
Keyword(s):  
Growth Parameters ◽  
Stock Assessment ◽  
Natural Habitat ◽  
Clarias Gariepinus ◽  
Growth Zone ◽  
Age And Growth ◽  
Okavango Delta ◽  
Flood Peak ◽  
Short Life Span ◽  
Age Estimates

Managing any inland fishery requires reliable age data and accurate estimates of growth rate. Clarias gariepinus, the largest catfish species in most tropical African floodplain river systems, is an important constituent of subsistence fishery catches. We used otolith-derived age estimates to describe patterns of age and growth for C. gariepinus from the Lower Okavango Delta in northern Botswana. Edge analysis of sectioned sagittal otoliths showed that growth zone deposition occurred during the annual flood peak between July and September. The maximum recorded age was 8 years. Growth was best described by the von Bertalanffy Growth Model of the form E[L|age] = 528.70(1–e–0.72(age+1.35)). A comparison of growth parameters from this study with those from previous studies suggests two distinct populations of C. gariepinus between the Upper and Lower Okavango Delta, emphasising the importance of regional stock assessment for key fishery species. The fairly short life span and high variability in growth of C. gariepinus are important indicators that it is imperative to maintain natural habitat and flow regime for sustainable management of fishery resources in the Lower Okavango Delta.

Multi-channel Attention-Fusion Neural Network for Brain Age Estimation: Accuracy, Generality, and Interpretation with 16,705 Healthy MRIs across Lifespan

2021 ◽  
pp. 102091
Author(s):  
Sheng He ◽  
Diana Pereira ◽  
Juan David Perez ◽  
Randy L. Gollub ◽  
Shawn N. Murphy ◽  
...  
Keyword(s):  
Neural Network ◽  
Age Estimation ◽  
Estimation Accuracy ◽  
Brain Age

Geostatistically modeling stem size and increment in an old-growth forest

1994 ◽  
Vol 24 (7) ◽  
pp. 1354-1368 ◽  
Author(s):  
Franco Biondi ◽  
Donald E. Myers ◽  
Charles C. Avery
Keyword(s):  
Spatial Patterns ◽  
Growth Rates ◽  
Spatial Dependence ◽  
Basal Area ◽  
Tree Density ◽  
Individual Growth ◽  
Old Growth ◽  
Model Estimate ◽  
Stem Size ◽  
Old Growth Forest

Geostatistics provides tools to model, estimate, map, and eventually predict spatial patterns of tree size and growth. Variogram models and kriged maps were used to study spatial dependence of stem diameter (DBH), basal area (BA), and 10-year periodic basal area increment (BAI) in an old-growth forest stand. Temporal variation of spatial patterns was evaluated by fitting spatial stochastic models at 10-year intervals, from 1920 to 1990. The study area was a naturally seeded stand of southwestern ponderosa pine (Pinusponderosa Dougl. ex Laws. var. scopulorum) where total BA and tree density have steadily increased over the last decades. Our objective was to determine if increased stand density simply reduced individual growth rates or if it also altered spatial interactions among trees. Despite increased crowding, stem size maintained the same type of spatial dependence from 1920 to 1990. An isotropic Gaussian variogram was the model of choice to represent spatial dependence at all times. Stem size was spatially autocorrelated over distances no greater than 30 m, a measure of average patch diameter in this forest ecosystem. Because patch diameter remained constant through time, tree density increased by increasing the number of pine groups, not their horizontal dimension. Spatial dependence of stem size (DBH and BA) was always much greater and decreased less through time than that of stem increment (BAI). Spatial dependence of BAI was close to zero in the most recent decade, indicating that growth rates in 1980–1990 varied regardless of mutual tree position. Increased tree crowding corresponded not only to lower average and variance of individual growth rates, but also to reduced spatial dependence of BAI. Because growth variation was less affected by intertree distance with greater local crowding, prediction of individual growth rates benefits from information on horizontal stand structure only if tree density does not exceed threshold values. Simulation models and area estimates of tree performance in old-growth forests may be improved by including geostatistical components to summarize ecological spatial dependence.

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