Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Elzey, Scott P.; Rogers, Katie A.; Trull, Kimberly J.

doi:10.7755/fb.113.1.5

Cited by 10 publications

(16 citation statements)

References 24 publications

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“…Indeed, the differences in age estimates between the three assessed structures were significant. This result agrees with other studies that have also observed tendencies to under or overestimate fish age depending on the structure used (Elzey et al, ). Significant correlations were found between age estimates based on gill covers v .…”

Section: Discussionsupporting

confidence: 93%

“…Since otoliths are not skeletal, similar processes do not leave such marks on these structures, rendering them less susceptible to age overestimation. This possibility is supported by studies that have found higher age estimates when using bones instead of otoliths (Blackwell et al, ; Elzey et al, ; Yates et al, ).…”

Section: Discussionmentioning

confidence: 82%

“…Although there are doubts about the use of repeatability as a reliable measure of accuracy of age estimates (Beamish & McFarlane, ), this approach is often the only one that is applicable when fish age is unknown, particularly in wild‐caught individuals. Other related measures of aging precision have been widely used ( e.g., average percent error, coefficient of variation, percent agreement between readers; Beamish & Fournier, ; Campana, ; Elzey et al, ; Khan et al, ; Sotola et al, ). However, use of these different approaches has made comparison among different studies difficult (Campana, ).…”

Section: Discussionmentioning

confidence: 99%

“…Among the studies that have compared aging structures for their reliability, otoliths are reported to be superior to other structures such as gill covers, spine or vertebral sections (Elzey et al, ; Ma et al, ; van der Meulen et al, ; Zymonas & McMahon, ). Our results complement these earlier findings in other fish species and suggest that otoliths are also the most reliable structure for aging G. aculeatus .…”

Section: Discussionmentioning

confidence: 99%

“…To a lesser extent, other structures such as pelvic or dorsal spines (DeFaveri et al, ; Gambling & Reimchen, ; Reimchen, ) and gill covers (Mukhomediarov, ; Patimar et al, ; Yershov & Sukhotin, ) have also been used for aging G. aculeatus . Worryingly, studies conducted in other fish species have shown that there may be large discrepancies in age estimates depending on which structure was used for the analysis (Baudouin et al, ; Elzey et al, ; Hüssy et al, ; Khan et al, ; Sotola et al, ; van der Meulen et al, ; Watkins et al, ; Zhu et al, ; Zymonas & McMahon, ). Two recent G. aculeatus studies have analysed several structures (DeFaveri & Merilä, ; DeFaveri et al, ), but no study has formally compared the age estimates from different structures and their reliability in G. aculeatus .…”

Section: Introductionmentioning

confidence: 99%

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Aging three‐spined sticklebacksGasterosteus aculeatus: comparison of estimates from three structures

Yurtseva

Noreikienė

Lajus

et al. 2019

Journal of Fish Biology

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In order to assess the accuracy and reliability of age estimates from calcified structures in the three-spined stickleback Gasterosteus aculeatus, we evaluated intra and inter-reader repeatability from three structures: otoliths, gill covers and pelvic spines). Average age estimates were also compared between the structures. The overall intra-reader repeatability of age estimates were highest for otoliths (69%), lowest for gill covers (53%) and intermediate for spine cross-sections (63%). Although four of the seven readers had the highest intra-reader repeatability score for spine cross-sections, the inter-reader variance in this structure was much higher than in others. Otoliths were the easiest in terms of their pre-analysis treatment and exchange of materials (as digital images) between readers. In addition, otoliths are more well-studied compared with the other structures with respect to their development through ontogenesis; hence, age estimates based on otoliths should be the most reliable. Therefore, our recommendation is that whenever possible, analysis of otoliths should be the preferred approach for aging G. aculeatus. K E Y W O R D Sage, Gasterosteus aculeatus, gill cover, otolith, pelvic spine, repeatability

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Aging three‐spined sticklebacksGasterosteus aculeatus: comparison of estimates from three structures

Yurtseva

Noreikienė

Lajus

et al. 2019

Journal of Fish Biology

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Effect of straying, reproductive strategies, and ocean distribution on the structure of American shad populations

Poulet,

Lassalle,

Jordaan

et al. 2023

Ecosphere

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The use of species distribution models has proliferated, providing insights for sustainable management of migratory species in a globally changing environment. However, many of these models are based on statistical relationships developed from historical conditions that may not perform well under changing or even analogous conditions caused by climate change. In this paper, we used a mechanistic species distribution model called GR3D (Global Repositioning Dynamics for Diadromous Fish Distribution) to examine the integrated dynamics of American shad (Alosa sapidissima) populations across their native range along the Eastern U.S. coast, where the species demonstrates latitudinal variations in life histories and reproductive strategies. The initial design of the model was adapted to incorporate region‐specific parameterization to fit the species ecology. Then, a sensitivity analysis was performed to test the influences of uncertain processes regarding American shad distribution at sea, straying and reproduction on key characteristics of the species distribution. The sensitivity analysis showed the influence of the Allee effect (i.e., “depensatory” process) and the homing rate (i.e., fidelity to the breeding sites) on the probability of presence and abundances among catchments and metapopulations estimated by the model. Contrary to the homing rate, the distance of straying did not change the estimated number of metapopulations or abundances. Homing strength, however, was quite influential. The integration of complex migration patterns during the marine phase (i.e., wintering and summering offshore areas) provided more likely estimates of the species' overall distribution. Overall, our study illustrated the utility of incorporating factors governing the large‐scale distribution of migratory species to improve local management.

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Patterns of Hatchery‐Produced Returns of American Shad in the James River, Virginia

McGrath

Watkins

Magee

et al. 2022

N American J Fish Manag

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American Shad Alosa sapidissima is an anadromous clupeid that once supported a robust fishery but has declined drastically throughout its native range due to overfishing, dam proliferation, and poor water quality. A hatchery program on the James River in Virginia was introduced in 1992 to support the recovery of stocks. Following a moratorium of the fishery enacted in 1994, a fisheries-independent survey was initiated in 1998 to monitor the population recovery efforts and status of American Shad stocks in Virginia. This paper examined 22 years of monitoring data for the James River and determined the effect of hatchery inputs on the James River stock of American Shad. The spawning stock index increased from 2.57 in 1998 to a peak of 9.33 in 2003 but has generally been declining since and has been at very low levels in most recent years. The hatchery prevalence for female American Shad (i.e., the percentage of fish derived from the hatchery) ranged between 3.6% and 60.5%. Years with higher spawning stock index values were significantly correlated to higher percentages of hatchery fish returning to spawn. The stock-recruitment relationship was best explained by the Ricker model, which had the lowest residual standard error and Akaike information criterion value. A threshold level of hatchery-released individuals (approximately 4 million larvae) was necessary to achieve the highest numbers of returning spawners, but stocking above 7 million larvae correlated with declining returns. Long-term monitoring of the James River American Shad spawning population allowed for the critical examination of the contribution of hatchery individuals to the yearly spawning run and the relative success rate of each hatchery year-class. From these data, we consider that the James River spawning stock of American Shad was dependent upon hatchery inputs, with ideal hatchery returns occurring during years of moderate levels of hatchery stocking.

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Comparison of 4 aging structures in the American shad (Alosa sapidissima)

Cited by 10 publications

References 24 publications

Aging three‐spined sticklebacksGasterosteus aculeatus: comparison of estimates from three structures

Aging three‐spined sticklebacksGasterosteus aculeatus: comparison of estimates from three structures

Effect of straying, reproductive strategies, and ocean distribution on the structure of American shad populations

Patterns of Hatchery‐Produced Returns of American Shad in the James River, Virginia

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